[JKPWEB]

Originally Posted by Allbert

I think your car has either the 4T40E or 4T45E transmission, depending on whether it is a 4 or 6 cylinder engine... LS probably is a 6, so that would be the 4T45E. If you're vehicle stays in 1st gear all the time, there should eventually be some sort of trouble code to give you a hint of what's wrong. If you're speedometer is working, it's probably not your speed sensor. If you still have reverse but don't have any of the other forward gears (2nd through 4th), then it sounds like your 2nd clutch is not engaging. This could be that the clutch itself is burned up (if you really do have nasty/burnt fluid, then this is a good possibility) or possibly that the 2nd clutch controls are not working. If it turns out that the clutch is burnt, you need a rebuild. If it's just the controls, then it could be as simple as a shift solenoid failure (both A and B are supposed to be OFF for 2nd, so no 2nd would mean that one is stuck ON. Solenoid A is ON and solenoid B is OFF for 1st, so could be solenoid A is staying ON) or it could be some of the downstream components in the valve body (stuck shift valve, leaky accumulator, etc.). In either case, you'd have to get to the valve body to troubleshoot and replace any of these items, and that is a pain for the 4T45E since the side cover has to come which involves a good bit of work to get to. My advice, if you want to keep this car, is to shop around and ask some friends if there is a tranny shop that they really trust in your town. It sounds like you're probably going to need professional help.

I have an issue with 4T40E 2nd gear. Stays in 1st until road speed reached 20+- level load 3500 rpm and then will shift into 3rd upon slight release of accelerator. Does not engage 2nd at all. If 2nd gear clutch pack is not the issue, what would be the possible problems...stuck valve? Thanks.