Jan 252015

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?

  One Response to “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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