Rear Differential Question???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BarryB · 12-22-2007, 06:38 PM

I have a 71 coil sprung rear(one legger) in my 68. I found a posi-unit in a 73-up 1/2 ton 2wd truck.
Can I can swap the carriers from the
73-up into my 71 housing and still use my 71 axles.
I am trying to learn has much as I can before I go and make a deal for the rear out of the truck. So any info would be appreciated.
P.S. Both diffs. are 12 bolts.

**special-K** · 12-23-2007, 01:53 AM

Later/earlier doesn`t matter.But over 3.73/under 3.73 does.There are two series in carriers and have to be same/same.I have 3.42s (posi) which never came in our years that I`ll swap into my truck`s rear soon,I hope.Mine has 3.08s but need replaced due to damage.

BarryB · 12-23-2007, 03:35 AM

Ok, now lets say the newer one had 3:08 gears, Does that mean I can put in a 3:42 on that carrier without much trouble?
I put 3:73 gears in Nova I had, it originally had a 2:41 gear. I had to put a spacer in between the gear and carrier.

12-22-2007, 06:38 PM	#1
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Rear Differential Question???? I have a 71 coil sprung rear(one legger) in my 68. I found a posi-unit in a 73-up 1/2 ton 2wd truck. Can I can swap the carriers from the 73-up into my 71 housing and still use my 71 axles. I am trying to learn has much as I can before I go and make a deal for the rear out of the truck. So any info would be appreciated. P.S. Both diffs. are 12 bolts. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

12-23-2007, 01:53 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Rear Differential Question???? Later/earlier doesn`t matter.But over 3.73/under 3.73 does.There are two series in carriers and have to be same/same.I have 3.42s (posi) which never came in our years that I`ll swap into my truck`s rear soon,I hope.Mine has 3.08s but need replaced due to damage. __________________ "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; 12-23-2007 at 01:54 AM.

12-23-2007, 03:35 AM	#3
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: Rear Differential Question???? Ok, now lets say the newer one had 3:08 gears, Does that mean I can put in a 3:42 on that carrier without much trouble? I put 3:73 gears in Nova I had, it originally had a 2:41 gear. I had to put a spacer in between the gear and carrier. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

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