4L60E Shift Improvement Kit * Bind up in reverse * Low and reverse clutch burn up * Delayed engagement in forward and reverse * Slide in 2nd * 3-4 clutch burn up * More lube oil * Clutch and band failure * Code 1870/converter burn-up The Superior 4L60-E kit helps prevent premature wear of the forward sprag. Converts lock-up to an on/off system to help stop the TCC slippage code.