It Still Runs is the go-to destination for all things cars. From motors to radiators and everything in between, we've got you covered.


GM Transmission Torque Specifications

by Rob Wagner

Tightening General Motors manual and automatic transmissions to the engine block requires specific twisting force with a torque wrench. The torque wrench allows the mechanic to tighten the bolts at a specific pressure called pound-feet.

Small-Block Engines

Chevrolet small-block engines, produced by General Motors, include the 267-, 327- and 350-cubic-inch V8s. The torque specifications for the bellhousing that mounts the transmission to the engine block is 25 ft.-lbs. The harmonic damper's torque is 60 ft.-lbs. The clutch pressure plate is 35 ft.-lbs. The automatic transmission flexplate must be torqued to 60 ft.-lbs. The manual transmission's flywheel also must be 60 ft.-lbs.

Big-Block Engines

Torque specifications differ slightly between big-bock and small-block Chevy engines and transmissions. Big-Block engines require 85 ft.-lbs. of torque pressure for the harmonic damper. The flexplate, flywheel, clutch pressure and bellhousing require the same torque specifications as the small-block versions.

Smaller GM Engines

GM transmissions matched with 3.0-liter and smaller engines require different torque specs. The 2.2-liter GM engine matched with a Borg T-5 transmission requires 55 ft.-lbs. to mount the transmission in the bellhousing. The cover plate to the transmission is 46 ft.-lbs. The transmission to the engine block on all pre-1999 cars is 66 ft.-lbs. Model year 1999 and later models require 35 ft.-lbs.

More Articles