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No the tranny never shifts on it's own. The only time I can get it to shift is if I do it manually. Never upshift or downshift.

Thanks for all the replies. I have not done any further investigation really but I think I may have narrowed some things down. To clarify I don't have the AW4 I have the 42RE.

The unplugged...

4.3LXJ .... ok when I was up under the jeep changing the filter before we took the transmission pan off we seen this plug that had 3 exposed wires coming off of it. As your laying on your back...

Ok so could there be a fuse that would make all 3 of the solenoids throw codes or is it common for all 3 to go bad at once? Also, what is the damage to the vehicle if I continue to drive it without...

Alright so I think I just solved my problem! LOL. I was reading on another thread about how to check the codes manually and I am throwing codes 23, 22, 21 which are all the solenoids!

Ok so we just took it for a drive to see what was happening when it is "supposed" to be shifting. Usually in a non-broken vehicle you would see the rpms drop a little when it shifts. Getting on the...

I have watched the tach and it jumps up to 2k rpm before it starts to move. When you take your foot off the brake at a stop it doesn't move forward at all. Once it gets moving the acceleration is...

I think so but how can I tell? I don't feel it shift at all except when I put it in R or D from Park. Also it's only 2wd.

Ok so I just picked up a 1993 Jeep Grand Cherokee Laredo, straight 6, 4.0l. When we bought it I believe it had been sitting a while. We've cleaned it up vacuumed it out and what not. So here's my...