Transmission Identification

Hydra-Matic 4L80-E Transmission ID Location:

Automatic Transmission:
Hydra-Matic 4L80E (MT1)
The Hydra-Matic 4L80E is a fully automatic rear wheel drive electronically controlled transmission. It provides four forward ranges including overdrive.

Oil pressure is supplied by a gear type oil pump. Oil pressure is regulated by a force motor solenoid, and shift points are controlled by shift solenoids via PCM/TCM operation. The [1][2]torque converter clutch apply and release is controlled by a pulse width modulated solenoid.

Major Components:
^ Torque Converter - with converter clutch and dual stators
^ Front and Rear band assemblies
^ Forward, Intermediate, Direct, Fourth and Overdrive multiple disc clutches
^ Three planetary gear sets
^ Overdrive and Lo roller clutches
^ Intermediate sprag clutch
^ Control valve assembly with two electronic shift solenoids
^ Input and output speed sensors
^ Bolt on case extension

Hydra-Matic 4L60 Transmission ID Location:

Automatic Transmission:
Hydra-Matic 4L60 (MD8)
The Hydra-Matic 4L60 transmission is a fully automatic transmission used in rear wheel drive vehicles which provides four forward gear ranges and a reverse.

Major Components:
^ [1][2]Torque Converter Clutch Assembly
^ Vane Type Pump
^ 2-4 Band Assembly
^ Five Multiple Disc Clutches
^ Two Planetary Gear Sets
^ One Sprag Clutch
^ One Roller Clutch
^ Valve Body Assembly

The 4L60 transmission has several variations of electronic control system types. Refer to transmission name plate for specific two letter model and third letter, transmission identification reference. See Automatic Transmission Wiring Diagrams.


Manual Transmission:
New Venture Gear 4500 5-Speed (MT8)
The New Venture Gear 4500 five-speed manual transmission provides synchronized shifting in all forward gears and constant mesh helical gearing for reduced noise.

Other features include an overspeed inhibitor from low to first gears, dual cone low to first gear synchronizer, and a lockout inhibitor from overdrive to reverse gear.

New Venture Gear 5LM60 5-Speed (MG5)
The five-speed 85mm overdrive transmission has a diecast aluminum case. They are in constant mesh and fully synchronized in all forward speeds. Gear shifting is done with a shift tower mounted shift lever.