A/T - Delayed Engagement In Drive/Reverse

91pontiac14

Bulletin Number: 92-7-4
Reference Number: 107105
Publish Date: 11/91


Subject: DELAYED ENGAGEMENT IN DRIVE/REVERSE
(REPLACE INPUT CLUTCH PISTON OUTER SEAL)

Models
Affected: 1991-92 6000, BONNEVILLE, GRAND PRIX
AND TRANS SPORT MODELS W/4T60/4T60E


The above condition could be caused by a rolled or cut input clutch piston outer seal. The initial comment is often a delay in drive cold. The condition will sometimes develop into a no/delay drive or reverse cold and delay hot over a 2000-5000 mile range. If this condition is encountered, it is recommended that the input clutch piston outer seal be replaced.

NOTE: An air check of the piston as a diagnostic aid could be misleading.

Refer to the service manual diagnostic section for other causes of delayed engagement. GM Powertrain is currently performing a root cause analysis on this condition.