CAUSE: The cause may be, that you have adjusted the intermediate band incorrectly, or the seal rings on the 1-2 accumulator piston are leaking.
CORRECTION:
We have gotten into the habit of adjusting the intermediate band with a visual adjustment during the rebuild process, before we install the bottom pan. This is a grave mistake on the 42RE transmission. You must tighten the adjusting screw to 72 inch pounds, and then back the adjusting screw off exactly 3-5/8 turns, as shown in Figure 1. In some cases we have also
had to install the previous design 1-2 accumulator piston with steel seal rings as shown in Figure 2.
To know more about auto repair, you can get some hot car tools like maxiscan ms509 and Creader VI.
