This valve body kit deals with these problems: 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 This Shift Correction Package offers regular and heavy duty applications in one package. The Superior 4L60-E kit helps prevent premature wear of the forward sprag. Improves overall performance and shift quality. Converts lock-up to an on/off system to help stop the TCC slippage code.