Oil Pump

WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.

Install gasket on transmission case. Install forward clutch and oil pump assembly in transmission case. Install oil pump-to-case bolts except bolt in 10 o'clock position to check end play. See Fig 1. Tighten bolts to 18 ft. lbs. (24 N.m).

Fig 1: Pump Cover Attaching Bolts
Courtesy of GENERAL MOTORS CORP.

CAUTION: If turbine shaft cannot be rotated as pump is being pulled into place, forward or direct clutch housings have been installed improperly and are not indexing with all clutch plates. This MUST be corrected before pulling pump fully into place.
Recheck front unit end play. See FRONT UNIT END PLAY CHECK under TRANSMISSION DISASSEMBLY. Install remaining pump attaching bolt with washer. Install front oil seal.