Dana 70 and 70hd Use different gear sets? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Leedogg · 04-29-2011, 07:08 PM

Looking on Ebay(and the net in general) for gearsets for my Dually with a 70 hd...but all I am finding are Dana 70 ring/pinions....but 70 and 70hd master bearing/install kits. do they use the same gearsets? And best I can tell- a 3.54 is the highest gear I can find for it, is that tall as they get?

I'd like to be able to pull my car at 75-80 at about 23-2500 rpm....possible with a non OD trans?

b454rat · 04-29-2011, 08:56 PM

There are a bunch of variations of 70s out there, not sure what is different from one to the other. I know one of the model 70s that was put in the early Cummins trucks had 3.08s in them.

Check out Summit Racing or Ring-pinon.com, might be able to find the difference there.

78customdeluxe · 04-29-2011, 09:28 PM

Quote:

Originally Posted by b454rat

There are a bunch of variations of 70s out there, not sure what is different from one to the other. I know one of the model 70s that was put in the early Cummins trucks had 3.08s in them.

Dont hold me to it, but I'm pretty sure that the early cummins had whats called a dana 71 to house the 3.08's because of clearance inside the 70 housing. I know the fronts with 3.08's were actually a dana 61. Ring gears from a 60 will not fit in a 61, so i'm goin to assume that goes the same for the 70/71. I am fairly certain that any 70 gear set will fit in any 70 case. The differences are in the external bearing sizes. So you will want a bearing kit from a 70hd

BIG V · 04-29-2011, 11:20 PM

yes they use different ring and pinions there is different offsets on the carriers. there is a explanation on www.ringandpinion.com

04-29-2011, 07:08 PM	#1
Leedogg Registered User Join Date: Jan 2010 Location: Brewton AL Posts: 236	Dana 70 and 70hd Use different gear sets? Looking on Ebay(and the net in general) for gearsets for my Dually with a 70 hd...but all I am finding are Dana 70 ring/pinions....but 70 and 70hd master bearing/install kits. do they use the same gearsets? And best I can tell- a 3.54 is the highest gear I can find for it, is that tall as they get? I'd like to be able to pull my car at 75-80 at about 23-2500 rpm....possible with a non OD trans? __________________ 1989 Chevy Crew Cab Dually - 454/400, Trans Am Hauler, Future bagged project. 96 Trans Am: 383/m6 - 11.98@115 on 315 M/T D/R's - 408rwhp 394 rwtq 05 VW Passat TDI - 38mpg @75mph 07 Bandit 1250S - Two wheeled fun! Click here to see my FQuick Garage! Last edited by Leedogg; 04-29-2011 at 07:08 PM.

04-29-2011, 08:56 PM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,465	Re: Dana 70 and 70hd Use different gear sets? There are a bunch of variations of 70s out there, not sure what is different from one to the other. I know one of the model 70s that was put in the early Cummins trucks had 3.08s in them. Check out Summit Racing or Ring-pinon.com, might be able to find the difference there. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

04-29-2011, 11:20 PM	#4
BIG V Registered User Join Date: Jul 2009 Location: Northern California Posts: 411	Re: Dana 70 and 70hd Use different gear sets? yes they use different ring and pinions there is different offsets on the carriers. there is a explanation on www.ringandpinion.com __________________ 1991 Chevy suburban 3/4 ton 4x 4:56 and pulls great 1979 Chevy 1/2 ton long bed diesel 1974 Chevy crew cab short bed 3/4 ton 4x4 project 1991 Chevy suburban 2wd 1984 Chevy suburban 3/4 ton 4x 6.5 detroit with turbo 1961 Chevy pickup 1/2 ton 2wd 1975 gmc crew cab short bed 2wd

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