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?
84 buick lesabre 5.0L Limited
Keywords:Lesabre
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:
![thm200c transmission diagram](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNTAiIGhlaWdodD0iMjE0IiB2aWV3Qm94PSIwIDAgMzUwIDIxNCI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0iI2NmZDRkYiIvPjwvc3ZnPg==)
2.74:1 1st gear
1.57:1 2nd gear
1.00:1 3rd gear
2.07:1 reverse
The fourth gear is not actually a gear but instead the converter locking up.
Transmission Troubleshooting
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