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Overdrive 4L65-E Transmission - Bionic Transmission

Inside GM's Stronger, Faster 4L65-E Transmission

By Barry Kluczyk

The 4L60-E came along in the mid-'90s, and shortly thereafter its design was changed from a three-piece construction to a two-piece design. Currently, the L60 and L65 have a separate, 360-degree bellhousing, which completely encloses the torque converter. This was done to increase powertrain stiffness and reduce vibration.

The electronic versions of the transmission also use an electronically controlled capacity clutch, instead of a mechanical lock-up clutch. This design lets the computer decide on the necessary amount of slip, which maximizes fuel economy.

SOURCES
GMs Performance Parts
By Barry Kluczyk
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