pros and cons with 4L65E

[sobayshortbed]

I see the difference in appearence, but all im reading about is 4L60E and 4L80E transmissions. Is there any difference in getting a wire harness with that trans?

[clinebarger]

Originally Posted by sobayshortbed

I see the difference in appearence, but all im reading about is 4L60E and 4L80E transmissions. Is there any difference in getting a wire harness with that trans?

4L60E & 4L65Es are light duty transmissions, The 4L65E is a little stronger than a 60E. They are great for stock & mild 4.8, 5.3, 5.7 & 6.0s.

The 4L80E & 4L85E are heavy duty truck transmissions, They are heavy, & sap alot of power from the engine, But they handle alot of horsepower & torque. If your not making over 400 horsepower you dont need a 4L80E.

A 4L60E wiring harness can be modified to run a 4L80E & vice versa. The PCM will need to be programed to match the transmission your running.

[sobayshortbed]

thanks for the info, do you know what trans this is, i was told by the guy i got it from it was a 4l65e but im thinkin it is either a 6l80e or 6l90e.

[clinebarger]

Thats a 6L50E/6L80E/6L90E. You will need a Gen IV engine & controller to run that transmission, It WILL NOT work with a Gen III engine.

With engine are you using?

[sobayshortbed]

It is a complete setup and the motor is a gen IV, I have the wire harness but no brains for the motor and trans. Thanks for the info, is there any way to tell which one it is?
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[clinebarger]

Do you have a VIN for the truck the engine came out of? The good news is the TCM (transmission control module) is inside the transmission. I just hope you have the harness for the 6 speed (Not all Gen IV engines had this style transmission) & a VIN would be the easy way to know.