1990 rear differenial question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cheford · 05-27-2011, 06:35 PM

I have a rear diff from a 1990 2wd silverado that I would like to have narrowed by 3 inches. The axles can't be machined because they are under cut by the splines. I would like to maintain the 5 on 5 bolt pattern, does anyone know if there is another vehicle that might have shorter axles with the 30 spline and possibly 5 on 5 bolt pattern.

scotts62 · 05-28-2011, 09:13 AM

Moser axles will have some to fit it, all they need is the measurement on how much and they will take care of it. Not sure if your wanting to spend that much or not though..

cheford · 05-28-2011, 10:12 AM

Quote:

Originally Posted by scotts62

Moser axles will have some to fit it, all they need is the measurement on how much and they will take care of it. Not sure if your wanting to spend that much or not though..

Thanks, I'm going to check them out.

cheford · 05-29-2011, 07:47 PM

After checking out Moser Engineering I found out that the 1991 to1996 Chev Caprice has a 10 bolt differenial that is 60.7 inch wide and has a 5 on 5" bolt pattern. Now I have to find one.

Would a 10 bolt on a car be the same as the truck as far as gearing goes. It appears that most gearing in the Caprice's had 2.95's but found out today that the roadmasters had 2.56s.

cheford · 05-31-2011, 08:25 PM

Bump

BigBlocksRule · 05-31-2011, 09:08 PM

IIRC, they have different diameter ring gears, truck is 8.5, car is 8.25 and they're not interchangeable.
Have you thought about trying to find a 14-bolt semi-floater? They have huge axles that can be shortened and redrilled for 5-lug pattern and use old 12-bolt drums, backing plates and brake hardware. Their gov-lock is a lot beefier than a 10-bolt, too.

05-27-2011, 06:35 PM	#1
cheford Registered User Join Date: Apr 2007 Location: ontario Posts: 247	1990 rear differenial question I have a rear diff from a 1990 2wd silverado that I would like to have narrowed by 3 inches. The axles can't be machined because they are under cut by the splines. I would like to maintain the 5 on 5 bolt pattern, does anyone know if there is another vehicle that might have shorter axles with the 30 spline and possibly 5 on 5 bolt pattern.

05-28-2011, 09:13 AM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: 1990 rear differenial question Moser axles will have some to fit it, all they need is the measurement on how much and they will take care of it. Not sure if your wanting to spend that much or not though.. __________________ Scott 93 crew cab build Project 62

05-29-2011, 07:47 PM	#4
cheford Registered User Join Date: Apr 2007 Location: ontario Posts: 247	Re: 1990 rear differenial question After checking out Moser Engineering I found out that the 1991 to1996 Chev Caprice has a 10 bolt differenial that is 60.7 inch wide and has a 5 on 5" bolt pattern. Now I have to find one. Would a 10 bolt on a car be the same as the truck as far as gearing goes. It appears that most gearing in the Caprice's had 2.95's but found out today that the roadmasters had 2.56s. Last edited by cheford; 05-31-2011 at 08:24 PM.

05-31-2011, 08:25 PM	#5
cheford Registered User Join Date: Apr 2007 Location: ontario Posts: 247	Re: 1990 rear differenial question Bump

05-31-2011, 09:08 PM	#6
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 1990 rear differenial question IIRC, they have different diameter ring gears, truck is 8.5, car is 8.25 and they're not interchangeable. Have you thought about trying to find a 14-bolt semi-floater? They have huge axles that can be shortened and redrilled for 5-lug pattern and use old 12-bolt drums, backing plates and brake hardware. Their gov-lock is a lot beefier than a 10-bolt, too.



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