Last week I bought a 94 XJ off a buddy for a grand. Not the prettiest shape, but nothing terrible either. My vehicle info isn't complete because the Jeep is still at his place and haven't done too much research on it yet.
My buddy loaned the Jeep, when he had it, to a mutual friend so he could make it to a job interview. The jeep was left in 4 hi and was traveling at highway speeds (70mph here). This is where the problem started, but I'm told it shouldn't have caused these issues, but I don't know; first jeep, only third 4x4.
When it first starts up for the day, putting it in drive or reverse, it will drive fine. Wait about five minutes, there's a slight buzzing sound, and the trans acts like it is dead. We don't know if the buzzing sound is related, because you only hear it with the good up and outside the vehicle.
Shutting the jeep off for a few minutes (say 5-15), it has forward and reverse again until 5 mins or so, then acts like a dead tranny. I believe trans is an AW4 (19 bolts on the pan). Anyone know what this problem is? Unplugging the TCU didn't help and it still had the problem shifting manually (if I unplugged the right electrical box, right under the glove box on that trim piece above your knee on pass. side of course) and the wiring under the dash is a nightmare. (It would also be very appreciated to know what color wires are what all over the interior.)
It's all fine until it loses the gears. Literally no sign its about to happen. Then poof. No more moving for a few minutes. I'm thinking the fluid is just really old as two P/O's that I know haven't touched it. But it is full and unburnt. Still gotta do the codes, forgot about it last time I was out screwing with it.
had the exact same problem on my 95 with the aw4, Your tranny filter is clogged. go buy a transmission filter kit and some dex III and youll be good to go. What was happening is that i would start it up and it would drive fine for about 3-5 minutes then loose all gears "dead" like you said. it was picking all the junk up off the bottom of the pan and clogging the filter so it didnt have enough pressure to engage the gears. id shut it down and all that crap would drop off the screen and back into the pan until i fired it up again.
Well if it wasnt the filter, i have an 87 trans am that this happened to. I was going about 90 on the highway and it ran perfectly fine. I got home and back in town then went to leave my house for a softball game and it would do this exact same thing. I had to get it completely rebuilt it was completely ruined. The rebuild was only like 1200 so not awful but yea.