Outlaw Star

One more thing to take into consideration is the torque converter. The torque converter has a stall speed, this is the RPM the converter must spin before engaging. When worn out, the engine will rev higher before engaging.

ct67_72

Convertors don't "wear out".
Check codes. Sounds like the trans is in "limp mode" which will cause 2nd or 3rd gear starts. This is not good for the trans and you will eventually burn it up. If you have to drive it start off in manual low and shift it up to drive.

Outlaw Star

Actually converters do go bad in transmissions. They are nothing more than a hydrokinetic clutch. Usally its the stator or bearings in them that fail. But usally they whine when bad.

Dumajones

What ? Please don't take this as a jab. But you can look all over the internet about this, They do wear out. Ive had Two car's in my life that needed the T-Convertors replaced. And when they were, it fixed the problem. so hmmm I think your Info is a little askew. A symptom of a torque converter going bad is the vehicle stalling when selecting a forward gear, reverse gear or slowing down to a full stop. This happens because it is in lock-up mode meaning that the clutches will not release and will not transfer the power as it should. It is the same effect as driving a vehicle with a manual transmission and not pushing in the clutch pedal when coming to a stop. it is equivalent to starting off in a higher gear in a vehicle with a manual transmission and not revving the engine as you get going. I'm just putting In my 2cents .

ct67_72

They almost never go bad. Not without something else making them fail.
I see plenty of people saying that they are bad, but very few that actually are. If the stator, or the one way clutch in the stator, was actually bad it would not be dependent on gear. It would be sluggish, very sluggish in the low RPM in all ranges.
If the trans takes off and operates properly in manual low than it is not an internal trans issue, well not a major one anyway, could be a faulty speed sensor, wiring, tcm, or a solenoid. Most likely not a solenoid though as they would still have to function for the trans to be in low, even when manually shifted.

ct67_72

Thats fine. A converter with the lockup clutch stuck applied is not "worn out" it is broken. There is a big difference. If you said that lockup shuddered or chattered than I would say it could be worn, as the only "wear" item in a converter would be the friction surface of the lockup clutch, which is not what we are talking about here. Stators, one way clutches, turbines, etc, are not "wear" items.
My information comes from years of running a transmission shop and rebuilding transmissions. Being registered with the ATRA, and ATSG, so I apologize if you feel my info is a little "askew" after the 2 units you have experience with.
You all obviously know much better than I do so carry on providing irrelevant information to this problem.
OP if you need any other info PM me. I am happy to help.

Outlaw Star

Now this is good info. At being a 94, the Xj still has a seperate TCM unlike the later models where it is integrated into the ECU. Any thoughts on the module being bad then?

timebomb0220

UPDATE:

The jeep is still acting the same way, question tho. My oil pressure is now reading almost 0 when im at a dead stop idle and roughly a little under 40 when im driving on the highway.

Could an oil pump be causing all this!

MonacaYankee

If the oil pump is bad the motor will lockup or blow up shortly.
I had oil pressure reading issues until I replaced the oil pressure sending unit. Some days it would peg out at 80 and other it would not read at all.

JK253

Sounds like separate issues; likely an oil pressure sending unit on the one and a bad fluid pump or torque converter on the other.

My trans was kind of doing the same thing. Just driving along one night and it started losing torque while the RPM went up. The fluid was dirty as hell (grayish) even though I'd just topped it off with fresh. Either the pump or converter started grinding itself to death, contaminating the fluid and essentially the whole tranny. It still drove fine for the most part but would occasionally give a harsh kickdown or just slip a bit under initial acceleration and it never felt like it was getting all of the power down. Just replaced it with a used one for $200 instead of hassling with the old one.