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Code 68, 4L80E
This work truck seems well taken care of with only 45,000 miles. The trans will set a code 68 (ratio error) because of torque converter slippage. I can see this on the scan tool with TCC locked, I apply the throttle and can get up to 350 RPM slippage. Then the... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1991 Chevrolet K2500 Cheyenne 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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