Dana 60 Ratios - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 05-13-2012, 09:08 AM

What ratios was the Dana 60 available in for 67-72? Was 3.73:1? I was under the impression GM offered 3.54,4.11.and 4.56. Does anyone know different? I could check my parts catalog,but thought I'd check here.

erikh09 · 05-13-2012, 11:23 AM

I just pulled the Dana out from my 67 3/4 ton and according to the SPID in the glovebox it is a 4.10? It is an eight lug in good shape but I have no use for it...

**special-K** · 05-13-2012, 11:36 AM

Yeah,they called it a 4.10,but it's actually a 4.11...close enough. The front Dana 44 on a K-model is actually a 4.09. The Dana and Corporate ratios run a bit different,due to different designs,but for all practical purposes are the same ratios. When ypu look in the parts catalog you see both 4.56:1 w/Dana and 4.57:1. you see the same with 4.11w/Dana and 4.10. I always wondered why they'd make two ring & pinions only 1/100th different,then realized it said w/Dana or not.

Dana 60-4.10/HO52-4.10

Dana 60-4.56/HO52-4.57

But,the main question here is did GM offer 3.73 in K/20s with Dana 60s in 67-72?

**LockDoc** · 05-13-2012, 12:04 PM

-
I bought one a while back that is supposed to be a 3.54. I think it is out of a Suburban. Coil spring.

LockDoc

factorystock · 05-13-2012, 01:11 PM

Quote:

Originally Posted by special-K

But,the main question here is did GM offer 3.73 in K/20s with Dana 60s in 67-72?

No, GM did not offer the 3.73 ratio in the Dana 60 C20 series. However, Ford did offer the 3.73 ratio in the Dana 60 F 250 during the 68-72 era.( I guess it was one of Fords "better ideas" ).

Mayo · 05-13-2012, 02:35 PM

My truck says 3.54

SS Tim · 05-13-2012, 03:19 PM

Tim, The higher gears you seek will have to come from another brand or aftermarket. But if you can live with 3.54s, then a Longhorn rear with a matching set of aftermakets for the front should do the trick. If I remember correctly Longhorns and 4x4 share the same frame/spring perch width.

**special-K** · 05-13-2012, 02:11 PM

Thanks for confirming that. I know you are book-wise and trust what you say,when it comes to factory specs. I like that motto and have never argued it. My take on it has always been,"Ford has the better idea and GM has the best ideas"

. Did Ford offer 3.54s? That's the best idea if you want tall gears for the hiway and maintain pulling power and that was GM's idea

1972RedNeck · 05-13-2012, 04:10 PM

Quote:

Originally Posted by special-K

Did Ford offer 3.54s?

Yup.

Mayo · 05-13-2012, 05:34 PM

Is that chart accurate? I have a 68 Longhorn with a 292, originally a four speed, and a dana 60 with 3.54s.

SS Tim · 05-13-2012, 06:50 PM

Yes, its accurate. Page above is from the '71 Data Book, but it pretty much sums up the info for a K20. Now your truck per the '68 Longhorn specs. would have the 4.57 as base standard. With the M20/292 the ratio gets bumped to the 4.10. An optional ratio is not listed for that powertrain either. The 3.54s were only seen in BB trucks. I'd be suprised if yours has factory 3.54s (as built) with a M20/292. You stated "My truck says 3.54." Where does it state this? I'm thinking that your truck has had an axle/ratio swap somewhere along the line. Below is the '68 Powertrain Chart and a Dana axle ID chart.

vectorit · 05-13-2012, 07:55 PM

I am happy to see these gear ratios, since I just picked up a '72 K20 D60 and D44 axle set.

Thanks for the info!

**A1971Blazer** · 12-01-2015, 12:48 PM

Quote:

Originally Posted by special-K

Thanks for confirming that. I know you are book-wise and trust what you say,when it comes to factory specs. I like that motto and have never argued it. My take on it has always been,"Ford has the better idea and GM has the best ideas"

. Did Ford offer 3.54s? That's the best idea if you want tall gears for the hiway and maintain pulling power and that was GM's idea

Don't forget...Ford had Dana to build a high-pinion front Dana 60......that WAS a "better idea"......

Mayo · 05-13-2012, 09:03 PM

It has a 3.54 tag on the rear end cover

SS Tim · 05-13-2012, 09:20 PM

Tag is a good start, but it is still likely a transplant. Does the SPID give any information? If you feel like pursuing this down the axle numbers stamped into the tubes will tell us most of the story. Bet the truck does pretty good lightly loaded and runs down the freeway at a good clip with 3.54s.

Mayo · 05-13-2012, 10:20 PM

Yeah, as far as I know I am the fourth owner and the truck has had some work done to it over the years, so I wouldn't be surprised if it has been swapped out.

**jocko** · 11-03-2012, 12:27 AM

just spitballin here - but a few questions:

1) I'm assumin one can't simply slap a 3.54 R&P on a carrier that previously held 4.10s (or 4.56s), correct? - the whole carrier would need to be swapped, yes?

2) Aftermarket was mentioned above - what is the lowest numerical R&P set that will fit on a 4-series carrier, 4.10? Who are some of the aftermarket companies that might carry some of this stuff? Currie? etc.

3) Is there an aftermarket means of making one's 4.10 D60 a 3.73?

SS Tim · 11-03-2012, 01:01 AM

You are going to need to research this some. If you go to an O/D you might want to keep the gears or change them only a little.
For your collection.
http://www2.dana.com/pdf/5309-3.pdf

1972RedNeck · 11-30-2015, 12:43 AM

Quote:

Originally Posted by jocko

just spitballin here - but a few questions:

1) I'm assumin one can't simply slap a 3.54 R&P on a carrier that previously held 4.10s (or 4.56s), correct? - the whole carrier would need to be swapped, yes?

2) Aftermarket was mentioned above - what is the lowest numerical R&P set that will fit on a 4-series carrier, 4.10? Who are some of the aftermarket companies that might carry some of this stuff? Currie? etc.

3) Is there an aftermarket means of making one's 4.10 D60 a 3.73?

If you currently have 4.10's, you can swap in 4.30's,3.92's, 3.73's, and 3.54's on your carrier.

If you have 4.56's, you can run 4.88's, 5.13's, and a fair bit lower.

It is also possible to swap in 3.07's if needed.

**jocko** · 11-03-2012, 01:54 AM

I agree - with 2004R may be a moot point. I wouldn't go with only the gear swap (to a 3.54 for example) because then my lil 350 might be pretty stressed with a camper. But I'm lookin down the road a bit - the 2004R conv will come first and that gets me awful close to ideal. But a 3.73 with the 2004R is just about perfect - roughly similar 1st gear final ration and still big o/d on the top end. 3.54 with 2004R is proabably too high of a gear for the highway - rpms would drop too much (when used in conjunction with a 2004R) - but a 3.73 might be just about right.

I have a feeling it would be cost-prohibitive to add in a 3.73 for the good I'd get out of it (AFTER a 2004R swap), but just exploring the options, if there are any, for now.

OH! And thanks for the manual, that is awesome Tim!

SS Tim · 11-03-2012, 02:16 AM

Did some playing at Randy's. Good news is that the split is 4.10 up that you have and need for less reduction or 4.56 down for more reduction.

http://www.ringpinion.com/b2c/PartsList.aspx?SearchMode=Cat&CatID=35&MakeID=3&ModelID=538&Side=Rear&DriveType=RWD&DiffID=266

Since I was already there went looking at other internal goodies like a True Trac or an E Locker ($1k).

http://www.ringpinion.com/b2c/PartsList.aspx?SearchMode=Cat&CatID=38&MakeID=3&ModelID=538&Side=Rear&DriveType=RWD&DiffID=266

SS Tim · 11-03-2012, 02:27 AM

If you did a stock axle swap from another C/20 the choices are 3.54, 4.10 and 4.56. Don't forget tire size when you run numbers.

**jocko** · 11-03-2012, 11:24 PM

so, if I read the link you sent correctly - THIS would bolt onto my current carrier: http://www.ringpinion.com/b2c/Produc...nd_Pinion_Sets

And voila, it's a 3.73 now.... Concur, 3.73 and 4.10 can bolt to same carrier. Very interesting..... Glad my truck came with a D60 in case I ever get around to doin this.

SS Tim · 11-04-2012, 12:11 AM

Its what about a 10% change? You could fake that with a taller set of used tires and see if you like it first. A LSD of some sort would be nice to have as well.

**jocko** · 11-04-2012, 01:38 AM

4.10 with a 2004R with 265/75/16 (31.7")tires =
1893 rpm @ 65
2184 rpm @ 75

3.73 with a 2004R with 265/75/16 (31.7") tires =
1722 rpm @ 65
1987 rpm @ 75

so about a 150-200 rpm drop at speed. Not a big deal. And probably not worth the cost, that's why if I do it, it will be waaaaay down the road and after I hit the lotto.
2004R is the best bang for the buck and pretty much eliminates the need for the 3.73. Just the 2004R alone drops 65 mph rpm by almost 1000 rpm/75 mph rpm by about 1100.
Just the 3.73 alone would help a bit, but not enough to warrant the cost in my mind - if wanting most bang for the buck, 2004R is the way to go for highway cruising (or a 700R4 for folks that like it, slightly (unnoticeable) higher rpm in o/d than a 2004R).
BUT, the "ideal" setup would be a 3.73 with the 2004R in my book - better 1st gear final drive ratio than the 2004R/4.10 combo. But I can live with that. I'm just glad it's not pukin trans fluid all over my garage anymore.

Compared to the current stock 4.10/TH350 setup, both are a huge improvement...
4.10 with a TH350 with 265/75/16 (31.7") tires =
2825 rpm @ 65
3259 rpm @ 75

05-13-2012, 09:08 AM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Dana 60 Ratios What ratios was the Dana 60 available in for 67-72? Was 3.73:1? I was under the impression GM offered 3.54,4.11.and 4.56. Does anyone know different? I could check my parts catalog,but thought I'd check here. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-13-2012, 11:23 AM	#2
erikh09 Registered User Join Date: Oct 2011 Location: Oxford,Pa Posts: 89	Re: Dana 60 Ratios I just pulled the Dana out from my 67 3/4 ton and according to the SPID in the glovebox it is a 4.10? It is an eight lug in good shape but I have no use for it...

05-13-2012, 11:36 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Dana 60 Ratios Yeah,they called it a 4.10,but it's actually a 4.11...close enough. The front Dana 44 on a K-model is actually a 4.09. The Dana and Corporate ratios run a bit different,due to different designs,but for all practical purposes are the same ratios. When ypu look in the parts catalog you see both 4.56:1 w/Dana and 4.57:1. you see the same with 4.11w/Dana and 4.10. I always wondered why they'd make two ring & pinions only 1/100th different,then realized it said w/Dana or not. Dana 60-4.10/HO52-4.10 Dana 60-4.56/HO52-4.57 But,the main question here is did GM offer 3.73 in K/20s with Dana 60s in 67-72? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 05-13-2012 at 08:32 PM.

05-13-2012, 12:04 PM	#4
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 26,069	Re: Dana 60 Ratios - I bought one a while back that is supposed to be a 3.54. I think it is out of a Suburban. Coil spring. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 11-07-2014 at 09:44 AM.

05-13-2012, 02:35 PM	#6
Mayo Cool Truck Join Date: Dec 2008 Location: Bowie,MD Posts: 1,869	Re: Dana 60 Ratios My truck says 3.54 __________________ 1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed

05-13-2012, 03:19 PM	#7
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios Tim, The higher gears you seek will have to come from another brand or aftermarket. But if you can live with 3.54s, then a Longhorn rear with a matching set of aftermakets for the front should do the trick. If I remember correctly Longhorns and 4x4 share the same frame/spring perch width. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban Last edited by SS Tim; 05-13-2012 at 03:26 PM. Reason: missing pic

05-13-2012, 02:11 PM	#8
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Dana 60 Ratios Thanks for confirming that. I know you are book-wise and trust what you say,when it comes to factory specs. I like that motto and have never argued it. My take on it has always been,"Ford has the better idea and GM has the best ideas" . Did Ford offer 3.54s? That's the best idea if you want tall gears for the hiway and maintain pulling power and that was GM's idea __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 05-13-2012 at 03:04 PM.

05-13-2012, 05:34 PM	#10
Mayo Cool Truck Join Date: Dec 2008 Location: Bowie,MD Posts: 1,869	Re: Dana 60 Ratios Is that chart accurate? I have a 68 Longhorn with a 292, originally a four speed, and a dana 60 with 3.54s. __________________ 1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed

05-13-2012, 06:50 PM	#11
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios Yes, its accurate. Page above is from the '71 Data Book, but it pretty much sums up the info for a K20. Now your truck per the '68 Longhorn specs. would have the 4.57 as base standard. With the M20/292 the ratio gets bumped to the 4.10. An optional ratio is not listed for that powertrain either. The 3.54s were only seen in BB trucks. I'd be suprised if yours has factory 3.54s (as built) with a M20/292. You stated "My truck says 3.54." Where does it state this? I'm thinking that your truck has had an axle/ratio swap somewhere along the line. Below is the '68 Powertrain Chart and a Dana axle ID chart. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

05-13-2012, 07:55 PM	#12
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: Dana 60 Ratios I am happy to see these gear ratios, since I just picked up a '72 K20 D60 and D44 axle set. Thanks for the info! __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

05-13-2012, 09:03 PM	#14
Mayo Cool Truck Join Date: Dec 2008 Location: Bowie,MD Posts: 1,869	Re: Dana 60 Ratios It has a 3.54 tag on the rear end cover __________________ 1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed

05-13-2012, 09:20 PM	#15
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios Tag is a good start, but it is still likely a transplant. Does the SPID give any information? If you feel like pursuing this down the axle numbers stamped into the tubes will tell us most of the story. Bet the truck does pretty good lightly loaded and runs down the freeway at a good clip with 3.54s. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

05-13-2012, 10:20 PM	#16
Mayo Cool Truck Join Date: Dec 2008 Location: Bowie,MD Posts: 1,869	Re: Dana 60 Ratios Yeah, as far as I know I am the fourth owner and the truck has had some work done to it over the years, so I wouldn't be surprised if it has been swapped out. __________________ 1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed

11-03-2012, 12:27 AM	#17
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,994	Re: Dana 60 Ratios just spitballin here - but a few questions: 1) I'm assumin one can't simply slap a 3.54 R&P on a carrier that previously held 4.10s (or 4.56s), correct? - the whole carrier would need to be swapped, yes? 2) Aftermarket was mentioned above - what is the lowest numerical R&P set that will fit on a 4-series carrier, 4.10? Who are some of the aftermarket companies that might carry some of this stuff? Currie? etc. 3) Is there an aftermarket means of making one's 4.10 D60 a 3.73?

11-03-2012, 01:01 AM	#18
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios You are going to need to research this some. If you go to an O/D you might want to keep the gears or change them only a little. For your collection. http://www2.dana.com/pdf/5309-3.pdf __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban



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11-03-2012, 01:54 AM	#20
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,994	Re: Dana 60 Ratios I agree - with 2004R may be a moot point. I wouldn't go with only the gear swap (to a 3.54 for example) because then my lil 350 might be pretty stressed with a camper. But I'm lookin down the road a bit - the 2004R conv will come first and that gets me awful close to ideal. But a 3.73 with the 2004R is just about perfect - roughly similar 1st gear final ration and still big o/d on the top end. 3.54 with 2004R is proabably too high of a gear for the highway - rpms would drop too much (when used in conjunction with a 2004R) - but a 3.73 might be just about right. I have a feeling it would be cost-prohibitive to add in a 3.73 for the good I'd get out of it (AFTER a 2004R swap), but just exploring the options, if there are any, for now. OH! And thanks for the manual, that is awesome Tim! Last edited by jocko; 11-03-2012 at 11:25 PM.

11-03-2012, 02:16 AM	#21
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios Did some playing at Randy's. Good news is that the split is 4.10 up that you have and need for less reduction or 4.56 down for more reduction. http://www.ringpinion.com/b2c/PartsList.aspx?SearchMode=Cat&CatID=35&MakeID=3&ModelID=538&Side=Rear&DriveType=RWD&DiffID=266 Since I was already there went looking at other internal goodies like a True Trac or an E Locker ($1k). http://www.ringpinion.com/b2c/PartsList.aspx?SearchMode=Cat&CatID=38&MakeID=3&ModelID=538&Side=Rear&DriveType=RWD&DiffID=266 __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

11-03-2012, 02:27 AM	#22
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios If you did a stock axle swap from another C/20 the choices are 3.54, 4.10 and 4.56. Don't forget tire size when you run numbers. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

11-03-2012, 11:24 PM	#23
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,994	Re: Dana 60 Ratios so, if I read the link you sent correctly - THIS would bolt onto my current carrier: http://www.ringpinion.com/b2c/Produc...nd_Pinion_Sets And voila, it's a 3.73 now.... Concur, 3.73 and 4.10 can bolt to same carrier. Very interesting..... Glad my truck came with a D60 in case I ever get around to doin this.

11-04-2012, 12:11 AM	#24
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Dana 60 Ratios Its what about a 10% change? You could fake that with a taller set of used tires and see if you like it first. A LSD of some sort would be nice to have as well. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

11-04-2012, 01:38 AM	#25
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,994	Re: Dana 60 Ratios 4.10 with a 2004R with 265/75/16 (31.7")tires = 1893 rpm @ 65 2184 rpm @ 75 3.73 with a 2004R with 265/75/16 (31.7") tires = 1722 rpm @ 65 1987 rpm @ 75 so about a 150-200 rpm drop at speed. Not a big deal. And probably not worth the cost, that's why if I do it, it will be waaaaay down the road and after I hit the lotto. 2004R is the best bang for the buck and pretty much eliminates the need for the 3.73. Just the 2004R alone drops 65 mph rpm by almost 1000 rpm/75 mph rpm by about 1100. Just the 3.73 alone would help a bit, but not enough to warrant the cost in my mind - if wanting most bang for the buck, 2004R is the way to go for highway cruising (or a 700R4 for folks that like it, slightly (unnoticeable) higher rpm in o/d than a 2004R). BUT, the "ideal" setup would be a 3.73 with the 2004R in my book - better 1st gear final drive ratio than the 2004R/4.10 combo. But I can live with that. I'm just glad it's not pukin trans fluid all over my garage anymore. Compared to the current stock 4.10/TH350 setup, both are a huge improvement... 4.10 with a TH350 with 265/75/16 (31.7") tires = 2825 rpm @ 65 3259 rpm @ 75 Last edited by jocko; 11-04-2012 at 01:46 AM.

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