84 buick lesabre 5.0L Limited

When stepping into it between 3rd and 4th gears, it flattens out or looses power. It only does this after it reaches 4th gear. throttle spring, maybe? Has a thm200c transmission. Or maybe the governor ball has a flat spot on it?


1 thought on “84 buick lesabre 5.0L Limited”

  1. The 1981-87 version was called 200C and had an electronically controlled lock-up torque converter. This transmission was an hydraulically controlled 3 speed.

    Gear Ratios:
    2.74:1 1st gear
    1.57:1 2nd gear
    1.00:1 3rd gear
    2.07:1 reverse
    thm200c transmission diagram

    The fourth gear is not actually a gear but instead the converter locking up.

    Transmission Troubleshooting

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