Factory gear ratio options for Dana axle on 3/4 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tx Firefighter · 11-14-2007, 08:25 PM

I popped the cover on my Dana rear axle today to service the innards and clean it up a bit.

It's a 3:54 ratio. Is this a stock ratio option or do I have a later rearend in my junk?

Kevin

67_C-30 · 11-14-2007, 08:37 PM

That's a stock ratio. It's actually a great all around gear for a 3/4 ton unless you're gonna be doing some real heavy towing.

Tx Firefighter · 11-14-2007, 08:40 PM

Thanks for the quick response. I actually could not be any happier with the ratio. I tend to do a good bit of highway driving.

67_C-30 · 11-14-2007, 08:42 PM

I agree. I am going to probably drop the gear ratio down to a 3.42 in my 67 C-30. That is the closest thing you can get in the 14 bolt I put in there. You put a 265/75R16 or a 285/70R16 on the 3/4 ton, and it will roll out with 3.54's!

Tx Firefighter · 11-14-2007, 09:32 PM

Yep, I roll on 265/75/16's and my truck cruises.

Longhorn Man · 11-14-2007, 10:13 PM

that was only avalible in big block trucks.

67_C-30 · 11-14-2007, 10:16 PM

Quote:

Originally Posted by Longhorn Man

that was only avalible in big block trucks.

Ahhh.. I didn't know that. Good to know though. What was common behind the 351E V6's?

1969 GMC · 11-14-2007, 10:56 PM

Quote:

Originally Posted by Longhorn Man

that was only avalible in big block trucks.

I'm sure if you really wanted it, you could have ordered it w/o the BB.

Rod · 11-14-2007, 11:15 PM

Had 3.54 in my 70 3/4 GMC 350/400 coils rear and in a 71 Chev 3/4 350 coils rear. Not just BB. Was the factory ratio if you had a 3/4 BB anything else was an option. Mind you were talking dana diffs here and not eatons.

**special-K** · 11-15-2007, 07:55 AM

My`72 K2500 has 3.54s and it loves the hiway for a heavy 4wd.I have 12.50/33s and it catches second if I`m on it (with power-loc).It hauls great,too.That ratio works with o/d just as well.From all I`ve gathered,the highest gearing with o/d that leave grunt enough to tow/haul is 3.42.That`s what goes into my`67 shortbed w/M22.It`ll roll pretty good like that.I think 3.08 would be too high for a manual.With any luck,it`ll end up with a GearVendors unit.

Tx Firefighter · 11-15-2007, 11:18 AM

K, I agree with you on gear ratios.

At heart, I'm an 88-98 Chevy truck guy. I worked on a million of them in the mid 90's as a dealership mechanic. A huge majority of them had 3.42 and overdrive. It's a perfect combination in my opinion.

As a side note, GM produced millions of 305 powered trucks in the early to mid 80's with the 700R4 overdrive and 2.73 rear gears. Talk about sick. I've converted a lot of them over the years to straight turbo 350's from the 700 and the 2.73 is still too tall even without OD.

**special-K** · 11-15-2007, 11:39 PM

I worked for a company that ordered three`81 trucks,all red/almond two-tone.Two were 1/2t and a 3/4t.The 1/2t trucks had the 2.73s/305/4spd manual drivetrain.I used granny to start off.I couldn`t imagine those staying in o/d on any grade at all.The masonry crew had the 3/4t at first,until we disolved that crew and started subcontracting.Then,I got that truck...350/3.73/4spd manual.I liked that one

.

**tkeduk8r** · 11-16-2007, 03:08 PM

I agree... that 3.54 (46:13) in my Dana is great... I just discovered that in my 72 c20... seems like a great all around ratio... now if I could just get my factory tach to read correctly I'd be set...
--Mike

11-14-2007, 08:25 PM	#1
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Factory gear ratio options for Dana axle on 3/4 ton I popped the cover on my Dana rear axle today to service the innards and clean it up a bit. It's a 3:54 ratio. Is this a stock ratio option or do I have a later rearend in my junk? Kevin __________________ I'm on the Instagram- @Gearhead_Kevin

11-14-2007, 08:37 PM	#2
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Factory gear ratio options for Dana axle on 3/4 ton That's a stock ratio. It's actually a great all around gear for a 3/4 ton unless you're gonna be doing some real heavy towing. __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 11-14-2007 at 08:38 PM.

11-14-2007, 08:40 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Factory gear ratio options for Dana axle on 3/4 ton Thanks for the quick response. I actually could not be any happier with the ratio. I tend to do a good bit of highway driving. __________________ I'm on the Instagram- @Gearhead_Kevin

11-14-2007, 08:42 PM	#4
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Factory gear ratio options for Dana axle on 3/4 ton I agree. I am going to probably drop the gear ratio down to a 3.42 in my 67 C-30. That is the closest thing you can get in the 14 bolt I put in there. You put a 265/75R16 or a 285/70R16 on the 3/4 ton, and it will roll out with 3.54's! __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 11-14-2007 at 08:44 PM.

11-14-2007, 09:32 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Factory gear ratio options for Dana axle on 3/4 ton Yep, I roll on 265/75/16's and my truck cruises. __________________ I'm on the Instagram- @Gearhead_Kevin

11-14-2007, 10:13 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Factory gear ratio options for Dana axle on 3/4 ton that was only avalible in big block trucks.

11-14-2007, 11:15 PM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: Factory gear ratio options for Dana axle on 3/4 ton Had 3.54 in my 70 3/4 GMC 350/400 coils rear and in a 71 Chev 3/4 350 coils rear. Not just BB. Was the factory ratio if you had a 3/4 BB anything else was an option. Mind you were talking dana diffs here and not eatons. Last edited by Rod; 11-14-2007 at 11:16 PM.

11-15-2007, 07:55 AM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Factory gear ratio options for Dana axle on 3/4 ton My`72 K2500 has 3.54s and it loves the hiway for a heavy 4wd.I have 12.50/33s and it catches second if I`m on it (with power-loc).It hauls great,too.That ratio works with o/d just as well.From all I`ve gathered,the highest gearing with o/d that leave grunt enough to tow/haul is 3.42.That`s what goes into my`67 shortbed w/M22.It`ll roll pretty good like that.I think 3.08 would be too high for a manual.With any luck,it`ll end up with a GearVendors unit. __________________ "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 ~

11-15-2007, 11:18 AM	#11
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Factory gear ratio options for Dana axle on 3/4 ton K, I agree with you on gear ratios. At heart, I'm an 88-98 Chevy truck guy. I worked on a million of them in the mid 90's as a dealership mechanic. A huge majority of them had 3.42 and overdrive. It's a perfect combination in my opinion. As a side note, GM produced millions of 305 powered trucks in the early to mid 80's with the 700R4 overdrive and 2.73 rear gears. Talk about sick. I've converted a lot of them over the years to straight turbo 350's from the 700 and the 2.73 is still too tall even without OD. __________________ I'm on the Instagram- @Gearhead_Kevin

11-15-2007, 11:39 PM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Factory gear ratio options for Dana axle on 3/4 ton I worked for a company that ordered three`81 trucks,all red/almond two-tone.Two were 1/2t and a 3/4t.The 1/2t trucks had the 2.73s/305/4spd manual drivetrain.I used granny to start off.I couldn`t imagine those staying in o/d on any grade at all.The masonry crew had the 3/4t at first,until we disolved that crew and started subcontracting.Then,I got that truck...350/3.73/4spd manual.I liked that one. __________________ "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 ~

11-16-2007, 03:08 PM	#13
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	Re: Factory gear ratio options for Dana axle on 3/4 ton I agree... that 3.54 (46:13) in my Dana is great... I just discovered that in my 72 c20... seems like a great all around ratio... now if I could just get my factory tach to read correctly I'd be set... --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's



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