Question about D70 in a 89 1 ton 4x4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

John S · 10-22-2008, 11:36 PM

I have a 89 1 ton 4x4 454 truck that has a dana 70 in it and the gear code indicates 3.42 gears , i have been looking around at available gearsets for the d70 and all i find is 3.54 . is it possible that the rear gear is 3.54 and front is 3.42 ? eventually i will pull cover and count teeth , but just curios if that was the case , the rear is in the faor sale section and i wanted to be accurate in its listing .

Thanks
John

**Palf70Step** · 10-24-2008, 06:23 AM

John, what code are you looking up to deteremine that it is a 3.42?

I am not positive but I vbelieve yor research is correct and that the D70 does not come with a 3.42.

John S · 10-24-2008, 08:40 AM

the code in glove box is gu6 which is 3.42, vin also matches glove box sticker

**Palf70Step** · 10-24-2008, 08:38 PM

This page lists that gear for it ( I think I read it correctly)

http://www.drivetrain.com/gm10.5.html

Now I do this alot, as I am not a super rearend guy (well at least not on truck...women though

)

You sure its a D70 and not a 14 bolt GM Corporate?

John S · 10-24-2008, 09:56 PM

cover has only 10 bolts , i know because i have 10 fingers and there is only one bolt per finger lol

**Palf70Step** · 10-24-2008, 10:12 PM

Well, I am lost then. GM version 10-bolt has that code and ratio, but like you said, no D70 with that ratio.

I wonder if it was swapped out from what came in the truck?

Edit....By your picture that is not a Dana, that is a GM 10 bolt

John S · 10-24-2008, 10:19 PM

the dana site shows a dana 70-3 hd with 3.42 gears for 871/2 to 89 k30 but truck is a k3500 , if there is a difference and no its not a 10 bolt its a full floater axle

what picture you talking about ?

**Palf70Step** · 10-25-2008, 07:20 AM

Ahh, never mind John. I looked at the wrong axle for sale ad

**special-K** · 10-27-2008, 09:28 AM

K30 and K3500 is the same thing,1t 4wd.I didn`y know any Dana was still used after the end of the`70s.I think those codes are screwy.They are probably 3.54s.That`s a Dana ratio and I doubt theres another that close.I think that may be the tallest gear Dana offered in 60s and 70s.

b454rat · 10-27-2008, 11:36 AM

My 89 had the 70 in it when I first got it. And Dana 70s were used up to the late 90s in a bunch of different applications. If the tag is GU6, it has 3.42s. The Dana 70 3HD is a screwy axle, it doens't use any other D70 stuff, other than wheel bearings of stuff like that. Dana expert lists it on their site too...

HotRodYJ · 10-27-2008, 02:41 PM

Drop the cover and look at the numbers on the ring gear. That's the best way to tell for sure.

**special-K** · 10-28-2008, 12:10 PM

Huh,thanks.I never caught that before.

86454k30 · 10-23-2010, 06:53 PM

I just bought an 89 K3500 SRW, it too has a Dana 70 with 3.42 gears.

10-22-2008, 11:36 PM	#1
John S Registered User Join Date: Apr 2005 Location: Rochester NY Posts: 38	Question about D70 in a 89 1 ton 4x4 I have a 89 1 ton 4x4 454 truck that has a dana 70 in it and the gear code indicates 3.42 gears , i have been looking around at available gearsets for the d70 and all i find is 3.54 . is it possible that the rear gear is 3.54 and front is 3.42 ? eventually i will pull cover and count teeth , but just curios if that was the case , the rear is in the faor sale section and i wanted to be accurate in its listing . Thanks John

10-24-2008, 06:23 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: Question about D70 in a 89 1 ton 4x4 John, what code are you looking up to deteremine that it is a 3.42? I am not positive but I vbelieve yor research is correct and that the D70 does not come with a 3.42. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

10-24-2008, 08:40 AM	#3
John S Registered User Join Date: Apr 2005 Location: Rochester NY Posts: 38	Re: Question about D70 in a 89 1 ton 4x4 the code in glove box is gu6 which is 3.42, vin also matches glove box sticker

10-24-2008, 08:38 PM	#4
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: Question about D70 in a 89 1 ton 4x4 This page lists that gear for it ( I think I read it correctly) http://www.drivetrain.com/gm10.5.html Now I do this alot, as I am not a super rearend guy (well at least not on truck...women though ) You sure its a D70 and not a 14 bolt GM Corporate? __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

10-24-2008, 09:56 PM	#5
John S Registered User Join Date: Apr 2005 Location: Rochester NY Posts: 38	Re: Question about D70 in a 89 1 ton 4x4 cover has only 10 bolts , i know because i have 10 fingers and there is only one bolt per finger lol

10-24-2008, 10:12 PM	#6
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: Question about D70 in a 89 1 ton 4x4 Well, I am lost then. GM version 10-bolt has that code and ratio, but like you said, no D70 with that ratio. I wonder if it was swapped out from what came in the truck? Edit....By your picture that is not a Dana, that is a GM 10 bolt __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! Last edited by Palf70Step; 10-24-2008 at 10:15 PM.

10-24-2008, 10:19 PM	#7
John S Registered User Join Date: Apr 2005 Location: Rochester NY Posts: 38	Re: Question about D70 in a 89 1 ton 4x4 the dana site shows a dana 70-3 hd with 3.42 gears for 871/2 to 89 k30 but truck is a k3500 , if there is a difference and no its not a 10 bolt its a full floater axle what picture you talking about ?

10-25-2008, 07:20 AM	#8
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: Question about D70 in a 89 1 ton 4x4 Ahh, never mind John. I looked at the wrong axle for sale ad __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! Last edited by Palf70Step; 10-25-2008 at 07:21 AM.

10-27-2008, 09:28 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,859	Re: Question about D70 in a 89 1 ton 4x4 K30 and K3500 is the same thing,1t 4wd.I didn`y know any Dana was still used after the end of the`70s.I think those codes are screwy.They are probably 3.54s.That`s a Dana ratio and I doubt theres another that close.I think that may be the tallest gear Dana offered in 60s and 70s. __________________ "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; 10-27-2008 at 09:34 AM.

10-27-2008, 11:36 AM	#10
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,485	Re: Question about D70 in a 89 1 ton 4x4 My 89 had the 70 in it when I first got it. And Dana 70s were used up to the late 90s in a bunch of different applications. If the tag is GU6, it has 3.42s. The Dana 70 3HD is a screwy axle, it doens't use any other D70 stuff, other than wheel bearings of stuff like that. Dana expert lists it on their site too... __________________ 2000 Chevy Tahoe Limited 3/5" drop 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon stock SAS 6"

10-27-2008, 02:41 PM	#11
HotRodYJ Registered User Join Date: Jan 2008 Location: Johnson City, TN Posts: 264	Re: Question about D70 in a 89 1 ton 4x4 Drop the cover and look at the numbers on the ring gear. That's the best way to tell for sure. __________________ 66 Chevy Stepside tandem project My junk: http://67-72chevytrucks.com/vboard/s...d.php?t=480902

10-28-2008, 12:10 PM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,859	Re: Question about D70 in a 89 1 ton 4x4 Huh,thanks.I never caught that before. __________________ "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 ~

10-23-2010, 06:53 PM	#13
86454k30 Registered User Join Date: May 2008 Location: Spokane, Washington Posts: 596	Re: Question about D70 in a 89 1 ton 4x4 I just bought an 89 K3500 SRW, it too has a Dana 70 with 3.42 gears.



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