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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 82Shortbed on August 10, 2008, 09:09:32 pm

Title: Which series 10 bolt?????
Post by: 82Shortbed on August 10, 2008, 09:09:32 pm

I've been looking at slapping a posi unit in my truck, and probably even bumping up to a 3.73 or 3.90 gear.  Which series carrier?  I've seen like 2, 3, and 4 series!  Gahh!  ANd How many splines?  It's a factory '82 8.5 10 bolt.

Title: Re: Which series 10 bolt?????
Post by: 81Cheyenne on August 11, 2008, 08:39:39 am

I believe that you're loking for a 3 series with 28 splines. I have an 81 10 blt and that's what it calls for.

Title: Re: Which series 10 bolt?????
Post by: VileZambonie on August 11, 2008, 10:17:54 am

It should be a 28 spline.

Title: Re: Which series 10 bolt?????
Post by: HAULIN IT on August 11, 2008, 01:32:00 pm

The 8.5 has a pretty large carrier run. I believe it's 2.73 up to 3.73 is the same...3 series. Some companies make the "thick" ring gear in some ratios to use with the lower number carrier also. Lorne

Title: Re: Which series 10 bolt?????
Post by: 82Shortbed on August 12, 2008, 01:21:50 am

Just what I needed, looks like a series 3 goes from 2.73-4.56.  So I'll be doing that here soon too!