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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The WA code does come up as a 3.73 ratio. Only way to know if it's really a Posi is going to be to take the cover off and look. usually, a factory Posi will have a tag on one of the cover bolts stating "Use Limited Slip Fluid Only", though it's not unusual for those to be missing. Your diff is the early 12 bolt, so it will have the 17 spline axle shafts. Thsi could have a bearing on rebuild parts for the Posi, if it has one. It will also effect things if you choose to install an aftermarket limited slip/locking differential, as thay are only made in the later 30 spline. This sin't too big of a problem, you'll simply need to go to a 30 spline axle shaft if you go that direction.
That rear will work just fine with a 350/TH700R4.
Bill Burmeister
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