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The Hummer Knowledge Base
Transmission Naming Convention:
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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