ORIGINAL PROBLEM:
Auto transmission on my son's 97 Impreza Brighton was grinding and running rough.

FIX:
Replaced with an auto transmission from a low mileage 97 Impreza Outback. All part numbers on the replacement transmission are the same as the removed transmission.

OUTCOME:
Replacement transmission runs smooth, however when making a turn, there is a "bucking" coming from the rear-end.

FACTORS:
1. The car did not do this "bucking" before the transmission was changed
2. Only the transmission was changed (no other parts or adjustments)
3. If a fuse is put into the "FWD" socket under the hood, the car does not buck
4. Trying semi-aggressive figure-8’s did not correct the problem

SOLUTION:
The replacement transmission had sat outdoors for a period of time after being removed for the donor car. This may have affected the transmission disks.

1. A 4oz bottle of “MOPAR Limited Slip Additive Friction Modifier” (available at Dodge dealers) was added to the transmission

2. The engine was idled with the transmission in neutral for a few minutes

3. The car was up the block and back with the fuse still in the “FWD” socket under the hood

4. The fuse was removed from the “FWD” socket and the car driven in “AWD”. The rear end “bucking” problem is gone and the car runs smooth