A/T - ATF Entering The Differential
TECHNICAL BULLETIN # 255DATE: 1994
TRANSMISSION: 010
SUBJECT: ATF in differential
APPLICATION: VW Audi
A seal that is often overlooked during the rebuild of a VW/Audi 010 transaxle is the O-ring on the driven gear of the governor.
This O-ring is under pressure and can allow ATF to enter the differential which, over time, can result in serious ring and pinion damage.
The driven gear O-ring should be replaced during every rebuild.
The Volkswagen part number is 089 409 637.
Note
Be careful, the seal is easy to cut during assembly. Use plenty of assembly lube.