Ok, this is a 1999XC70 - 130k miles - car slipping only in reverse, with or without driveshaft. Ordered a rebuild from volvo (from vin on car) 4speed not 5 speed.

Got new trans, installed, exact same issue, slips in reverse - no issues.

Took to dealer HO CODES from tcu - Nothing - nothing... cleared memory - double checked - no codes.

WHat are the chances of the exact same issue with a rebuild????