Re: Any experience with code 37?
The Jeep powertrain code (SAE) is P0740 (hex $94), No RPM drop at TCC lock-up. 9 times out of 10, the problem lies with an inoperative solenoid on the 32RE(TJ)/AW4(XJ)/42RE(ZJ) valve body. Most often an intermittent condition, and not the easiest to diagnose, especially w/o a DRB3 (or equiv).
Double check that trans fluid level, and make sure the TV cable is properly adjusted, with all other shifts clear and concise. If all else checks out, inside the pan is normally where the problem is. Not too hard a bill to swallow, even at a Dealership.
By the way, that solenoid on the shift cable is the Brake Shift Interlock, to prevent folks from pulling it into drive w/o their foot on the brake [img]images/icons/laugh.gif[/img]