I Have Adjusted The Trans Cable Under The Hood Several Times In A Short Period Of Time. After Several Weeks Its Back Out Of Wack. It Now Shifts At 4000 Rps And Wont Shift From 2nd To 3rd Untill 4200. Under A Load It Redlines And I Have To Let Off In Fear Of Over Reving..any Suggestions? LAST TIME THIS HAPPENED IT WOULD NOT SHIFT INTO OVERDRIVE UNTILL MADE THE ADJUSTMENT...