Automatic Transmission - Improper Operation
88chevy11Number: REISSUE 87-276-7A
Section: 7A
Date: APRIL, 1988
Subject: AUTOMATIC TRANSMISSION WEAR
Model and Year: 1985-87 SPRINT WITH AUTOMATIC TRANSMISSION
TO: ALL CHEVROLET DEALERS
This bulletin is being revised to add additional information under the differential side and pinion gears worn heading. All copies of 87-276-7A dated FEB., 1988 should be discarded.
Some Sprint vehicles may experience improper operation of the automatic transmission due to wear of the differential side and pinion gears and/or wear of the direct clutch drum bushing.
Corrective action was incorporated in vehicles built after the following serial numbers (last 8 VIN characters):
For differential side and pinion gear wear.
HK740463 (2 Door) HK740416 (4 Door)
For direct clutch drum bushing wear.
HK746352 (2 Door) HK746297 (4 Door)
Vehicles exhibiting these conditions built before the above serial numbers, should be repaired using the following parts which can be obtained from GMSPO.
DIFFERENTIAL SIDE AND PINION GEARS WORN
Replace worn/damaged parts as required, using new transmission case assembly, P/N 96057455 following shop manual procedures.
DIRECT CLUTCH DRUM BUSHING AND ASSOCIATED PARTS WORN/DAMAGED
Three different sets of replacement parts are available from GMSPO and the appropriate set should be ordered according to the extent of repair/replacement required. The sets and contents are described as follows:
Pump Set, Oil P/N 96057153
includes: Oil Pump 96057143
Ring, Oil Pump Cover Seal 96057149
Drum, Direct Clutch 96057146
Seat, Return Spring 96057147
Ring, Clutch Plate Snap 96057148
Washer, Direct Clutch 96057150
Washer, Direct Clutch 96057151
Cover Set, Oil P/N 96057154
Pump
includes: Cover, Oil Pump 96057144
Ring, Oil Pump Cover Seal 96057149
Drum, Direct Clutch 96057146
Seat, Return Spring 96057147
Ring, Clutch Plate Snap 96057148
Washer, Direct Clutch 96057150
Washer, Direct Clutch 96057151
Cover Set, Direct P/N 96057155
Multi Disc
includes: Cover, Oil Pump 96057144
Ring, Oil Pump Cover Seal 96057149
Clutch, Direct Multi-Disc 96057145
Washer, Direct Clutch 96057150
Washer, Direct Clutch 96057151
Follow shop manual procedures when installing any of the above sets of parts.
Labor Operation Number: K7620
Labor Time: 4.6 Hours