A/T - Turbine Shaft Seals

Number: 87-95

Section: 7A

Date: APRIL 1987
Subject: TURBINE SHAFT SEALS


Model and Year: ALL 1987 MODELS WITH
THM 700-R4 TRANSMISSIONS
TO: ALL CHEVROLET DEALERS


Solid (not "scarf cut") turbine shaft seals are used on 1987 THM 700-R4 transmissions that have an auxiliary valve body assembly (AUX VB). Refer to Chevrolet Dealer Service Bulletin 87-56 (Section 7A) dated January 1987 for details on identifying 1987 transmissions with or without an AUX VB.

If solid seals are not used during overhaul service on a 1987 THM 700-R4 transmission with an AUX VB, conditions of drive in neutral range and/or burnt clutches can occur.

Solid seals are not included in overhaul kits part number
8649965 (seals and gaskets) or 8649960 (complete). Solid
seals are available separately by ordering part number
8667035 (4 seals per package).

Use Kent-Moore service tools J-36418-1 and 2 to install and
size solid turbine shaft seals. Note: The sizing tool must
be altered to work properly. Grind the flange off of the
sizing tool. The flange, during use, contacts the housing
preventing sizing of the lowest seal.

Information in this bulletin is not in your 1987 Service
Manual.