GMC T Series 1994 Repair Manual page 711

Figure 26 Removing Rear Band and Selective Thrust
Washer
INSPECT, CLEAN AND REPAIR
SUBASSEMBLIES
The assembly of some components will require
use of an assembly lube. It is recommended that
TRANSJEL™ J 36850 or the equivalent of petroleum
jelly be used during assembly.
NOTICE:
Do not use any type of grease to retain
parts during assembly of this unit. Greases other
than the recommended assembly lube will change
transm ission fluid characteristics and cause
undesirable shift conditions and/or filter clogging.