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Old 07-02-2013, 09:45 PM
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looking for posi rear end

im looking for a good posi rear end for my 1985 chevy truck wanting 3.73 gears can anyone tell me a good rearend to look for or can anyone offer me a good one?


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Old 07-02-2013, 09:59 PM
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Originally Posted by greyghost85 View Post
im looking for a good posi rear end for my 1985 chevy truck wanting 3.73 gears can anyone tell me a good rearend to look for or can anyone offer me a good one?

Its a truck, get 4.10's
Oh and here's your "budget" heads from your other thread
ProMaxx Performance 2169 Patriot Performance SB-Chevy Aluminum Freedom Series Heads
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Old 07-02-2013, 10:09 PM
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this will get you looking in the right place ?

1985 chevy truck rear end 373 gears for sale
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Old 07-03-2013, 06:24 AM
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The '82 to '89 GM trucks had the 8.5 10 bolt with 28 spline axles. In '90 they upgraded to 30 spline axles. The rear end didn't change other than that. In '98 GM upgraded this rear end again to a 8.6 inch ring gear and they increased the differential bearing size to 3.062, the same as the 12 bolt. The reason for the bearing size increase was because when they increased the axle size in '90 they had to bore the hole in the differential case larger, which made the bearing journal too thin. They started having problmes with the left bearing breaking off of the differential case. If you want to increase the strength of the whole rear end then look for a '98 or later complete rear end. Many of the trucks in these years had 3.73 gears in them. Look for RPO code GT4 on the sticker inside the glove box. As far as I know all of the '98 and later rear ends had disc brakes too.

The problem with the GM truck rear ends is that the only limited slip differential that they used was the Governor Lock (Gov Bomb), which is not a good differential for high performance use. The Eaton Posi is a much better differential, but you have to buy it new and install it. Tom's Differentials is a great place to get the Eaton Posi.

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Old 07-04-2013, 10:51 AM
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This is the page from Eaton. They offer the Detroit Truetrac, Detroit Locker, Eaton carbon LSD and their elocker.

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