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Charlie's Garage Sale

125 THM

Also known as 3T40

Used 1980-81.  The 1982-up version was called 125C and had an electronically controlled lock-up torque converter.  There were MANY versions and were used in various GM models as well as some Isuzus.

This was an hydraulically controlled front wheel drive three speed transmission.

Top cooler line is the cooler return line.

Band adjustments:
Intermediate = not adjustable
Reverse = not used

Gear Ratios:
2.84:1 1st gear
1.60:1 2nd gear
1.00:1 3rd gear
2.067:1 reverse



(click on picture to enlarge)


Pan gasket

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