bes217

All info copied from All Data City LLC, this is a recall on the transmissions:

A/T - Delayed Forward Engagement, Slips on Take Off
Number: 86-65

Section: 7B

Date: APR., 1986
Subject: DELAYED FORWARD ENGAGEMENT, SLIPS ON TAKE OFF, AND/OR 2-3 UPSHIFT BUMP OR SHUDDER

Model and Year: 1985-86 THM 440-T4 TRANSAXLE

TO: ALL CHEVROLET DEALERS
FIGURE 1 - THM 440-T4 TRANSMISSION NAMEPLATE WARREN, MICHIGAN



A 1985 or 1986 THM 440-T4 transaxle (refer to Figure 1) may exhibit delayed forward engagement, slipping on takeoff from stops, and/or a 2-3 upshift bump or shudder. The condition (s) may be caused by leakage in the 1-2 servo circuit, which controls apply and release of the 1-2 band.
-SERVO PIPES



-SERVO PIPES



Seals are included at both ends of the apply and release pipes (refer to Figure 2 and 3) and on the servo piston. A damaged seal in any position may affect operation of the servo. A leaking apply pipe circuit may cause delayed forward engagement and slipping on takeoff when in first or second gear. A leak in the release pipe circuit may cause a 2-3 upshift bump or shudder. A 1-2 servo piston leak may cause any/all of the condition(s).
On November 15, 1985 (Julian date 319) a revised production installation process for the 1-2 servo apply and release pipes/seals began, to prevent cutting the seals during assembly.

When performing transaxle service, check transmission fluid for burned condition (burned fluid loses its red color and has an acrid odor). Burned fluid may indicate major internal repair requirements, and is a condition to be considered for SRTA usage.

If fluid condition is proper, inspect the servo pipe seals at both ends of each pipe and the 1-2 servo piston seals. The original pipes can be reused in field service. Replace any damaged seal as outlined in the appropriate Service Manual. Refer to the following list for service part numbers:

PART NUMBER DESCRIPTION
8656567 Seal, 1-2 Servo Pipe To Valve Body
8656568 Seal, 1-2 Servo Pipe To Case
8658160 Ring, Oil Seal, 1-2 Servo Piston
IMPORTANT: When installing the servo pipes into the control valve assembly, it is critical that the pipes are correctly aligned with the assembly bore to ensure that seal damage does not occur.

Copyright © 2003 ALLDATA LLC
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GMTech

You do realize that:

A) its NOT a recall, its merely a bulletin that says if you experience this problem, this is the most likely cause and here is how to fix it, and

B) There is not a single thirdgen F-body in the world that has a 440-T4 transmission.

Randy82WS7

heh, maybe could be one in the world if someone was odd enough or bored enough to put an F body on a J body or similar chassis


heh