I've recently changed the rear gears on my Impala from the stock 3.08 to 3.73. Setup was very easy and gears are silent. One thing I noticed, when the rear wheels were up only the driver side is spinning, even when the cruise control was set to around 40, the passenger side wheel was barely moving and can be turned by hand either way. I thought the posi was shot, so after breaking in the gears I gave it a full throttle launch and had a perfect 11. Should I change the posi or leave it alone.

 

The clutch-cone 10-bolt Auburn posi units do wear out and they can’t be rebuilt. Auburn also makes a Pro-Series posi unit for the GM 10-bolts that come with a two year warranty exchange.

WD