SUB KIT FOR INPUT DRUM REINFORCEMENT KIT
# 37590KS

SUB KIT FOR INPUT DRUM REINFORCEMENT KIT

The GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assembly is known to crack where the input shaft is pressed into it (where the overrun clutch rides).

Sonnax offers a hardened steel sleeve that reinforces the input drum to prevent this failure. OE overrun pistons must be machined when using this Sonnax input drum reinforcement kit.

  • Sleeve made from hardened chromoly steel
  • Can be installed in early- and late-model units*
  • Sleeve design will not block clutch feed oil

Note:
*Will not repair a cracked drum. Requires 96-earlier aluminum forward piston or billet forward piston # 37586, cannot be used with stamped steel forward piston.


Contents:

  • Reinforcement Sleeve
  • Overrun Piston Inner Seal

SONNAX Installation Instructions

Type of Product: Pistons
Years:
Alternative #: