87 S-10 rearend - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-21-2000, 08:50 PM Thread Starter
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87 S-10 rearend

Is the rearend out of trucks with 4.3 heavier duty than the rearend behind the 2.8? Is it a bolt on swap?

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post #2 of (permalink) Old 03-21-2000, 10:00 PM
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Re: 87 S-10 rearend

Starting in '88 with the 4.3, chevy had the 7 5/8 rear (you have the 7 1/2). I don't know if the '89 and up 2.8 had it or not. The ZR2's have the 8 1/2 rear that is 4" wider than normal S10's.
Never did it, but I'm pretty sure the 7 5/8 is a direct bolt in (assuming same ratio) and with the 8 1/2, you need some drive shaft mods.

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post #3 of (permalink) Old 03-22-2000, 11:56 AM
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Re: 87 S-10 rearend

The full size 10 bolt and the one in the ZR2 are the same 8.5 ring gear. This is the desirable of the 10 bolts. The newer 7 5/8 88Blazer is talking about is common in all newer S-10's. Its kinda a hunk o junk. In fact i heard from a GM mechanic they (factory) installed the wrong gasket on the rear diff and it does not get oil to the ends of the tubes the way it should. Don't know what years tho. Not many aftermarket parts available and I havent found a compairable axle in width to swap yet. Its 52 inces wide from back plate to plate. I think the ZR2's is 54" and is the perfect length.. Any one know of a good cantidate with no cutting of tubes??

-Troy 'WeaZle' McCarty

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post #4 of (permalink) Old 03-23-2000, 04:34 PM
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Re: 87 S-10 rearend

Hey WeaZle ,you know what the spring perch spacing is on that ZR2 axle
(same as the reg S truck??) wider in the as$ end wouldn't hurt my feelings.

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post #5 of (permalink) Old 03-23-2000, 05:58 PM
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Re: 87 S-10 rearend

Don't know about the perches. Trying to find one myself from 98 up. Has disk brakes.. that or a D-44 but not finding anything with out cutting axles and new shafts.

-Troy 'WeaZle' McCarty

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