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180 THM Also known as 3L30 Used 1977-80. The 1981-92 version was called 180C and had an electronically controlled lock-up torque converter. There were MANY versions and were used in various GM models including some Chevettes as well many Foreign vehicles. The transmission was an hydraulically controlled 3 speed. Rear cooler line is the cooler return line. Band adjustments:
Gear Ratios:
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 Transmission (click on picture to enlarge) |
 Pan gasket (click on picture to enlarge) |
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