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Old 12-24-2005, 09:05 AM
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Suggestions for a rear axle

I have a 91 GMC Sonoma , 350 bored 30 over , 5 grand into motor , turbo 350 trans . Problem is , it has the stock rear end and need to put in a posi unit . Can anyone tell me what it has as OEM . Can i swap out a complete rear axle from another truck or am i best of to to just change the carrier with a 10 bolt posi . cost is a bit of an issue , The truck is driven mostly on the street , will see the track a few times a year . At 55 mph now it is turning 2800 rpms . Thanks for your help , Jim

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Old 12-24-2005, 10:54 AM
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If you have the original glove box door still on the truck, there will be a list of RPO codes on a decal on the inside. Check the codes against this list it should tell you the diff size, gear ratio and posi or not.
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Old 12-24-2005, 12:04 PM
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The stock axle in there is a 7.5" ten bolt. It was adequate for the 4.3 V6 if you didn't stomp on it

Later S10s with the ZR2 offroad package had the 8.5" ten bolt and disc brakes. It'll bolt in, but there my be differences like driveshaft length, ujoint usage, etc, but its as direct as you'll get.
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