The Hummer Knowledge Base
The 3L80 is a turbo 400. The 4L60E is a turbo 700-R4. GM changed the naming convention.
3 - 3 speed 4 - 4 speed L - longintudinal (rear wheel drive) T - transverse (front wheel drive) 60 - strength factor (weak) 80 - strength factor (strong) E - electronic control
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