Advice on 1978 suburban limited slip differential in 1970 c10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Montierth · 01-27-2023, 12:48 AM

I would like posi/ limited slip rear end in my 70 c10. Currently have a 12 bolt w 3.08 gearing with 350/350turbo with leafs setup. I found a 1978 suburban rear end that is 12 bolt limited slip. So questions or advice 1. Will it fit without too much work ie driveline/ width etc. What to look for to make sure it's not worn out and need a rebuild. Thanks.

**Palf70Step** · 01-27-2023, 08:07 AM

I know the leaf springs brackets/saddles are in different positions. You'll have to cut and move thm inboard a bit on the newer axle. They should be same width as 70 was th change year. Even if you had leftover with the slightly narrower rear, the new one will work. The new one probably also has the bigger/HD (wider shoe), meaning more breaking power. Other than the saddles everything else should be fine.

Montierth · 01-27-2023, 10:33 AM

Quote:

Originally Posted by Palf70Step

I know the leaf springs brackets/saddles are in different positions. You'll have to cut and move thm inboard a bit on the newer axle. They should be same width as 70 was th change year. Even if you had leftover with the slightly narrower rear, the new one will work. The new one probably also has the bigger/HD (wider shoe), meaning more breaking power. Other than the saddles everything else should be fine.

Thanks for the info. I'm gonna try to contact the seller today and see if he knows the gearing. With my 350 tranny I have read dont want gearing much over 3.42?

I guess the other question could have been - would you guys just buy something like a Yukon limited slip kit with gearing like 3.42 and pay someone for the work or DIY?

**Palf70Step** · 01-27-2023, 12:10 PM

With a non overdrive transmission, I would stick with a 3.08 or 2.76 unless you are towing a lot. Not sure which way I woulkd go with ur question. For rear end stuff, if I need to go inide it, I normally take it to a local shop to get it setup right.

airdale94 · 01-28-2023, 09:28 PM

I wouldget a corporate 14bolt you can find them with I think most of them are 8 but there are some 6 lug.Maybe you could convert them to 5 lug

01-27-2023, 12:48 AM	#1
Montierth Registered User Join Date: Dec 2016 Location: QUEEN CREEK, AZ Posts: 272	Advice on 1978 suburban limited slip differential in 1970 c10 I would like posi/ limited slip rear end in my 70 c10. Currently have a 12 bolt w 3.08 gearing with 350/350turbo with leafs setup. I found a 1978 suburban rear end that is 12 bolt limited slip. So questions or advice 1. Will it fit without too much work ie driveline/ width etc. What to look for to make sure it's not worn out and need a rebuild. Thanks. __________________ 1970 GMC C1500 short fleet Sellers Regret - 1950 GMC - 1967 Chevy C10 - 1970 GMC C2500 Dually Flat Bed - 2003 Silverado

01-27-2023, 08:07 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,268	Re: Advice on 1978 suburban limited slip differential in 1970 c10 I know the leaf springs brackets/saddles are in different positions. You'll have to cut and move thm inboard a bit on the newer axle. They should be same width as 70 was th change year. Even if you had leftover with the slightly narrower rear, the new one will work. The new one probably also has the bigger/HD (wider shoe), meaning more breaking power. Other than the saddles everything else should be fine. __________________ 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!

01-27-2023, 12:10 PM	#4
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,268	Re: Advice on 1978 suburban limited slip differential in 1970 c10 With a non overdrive transmission, I would stick with a 3.08 or 2.76 unless you are towing a lot. Not sure which way I woulkd go with ur question. For rear end stuff, if I need to go inide it, I normally take it to a local shop to get it setup right. __________________ 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!

01-28-2023, 09:28 PM	#5
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: Advice on 1978 suburban limited slip differential in 1970 c10 I wouldget a corporate 14bolt you can find them with I think most of them are 8 but there are some 6 lug.Maybe you could convert them to 5 lug __________________ 68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member).



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