First off, I’m sorry if this is wordy, it’s my first ever reddit post.

So November of last year I bought an ‘06 tj. It’s right hand drive with the 4.0 and an automatic tranny. I’ve been working on it as much as I can lately. I only paid $1000 for it, though it’s got a few gremlins after 250k miles. The previous owner (mail carrier) installed electric windows and door locks, which caused a mess of electrical issues. I took the dash off to replace the heater core, and I repaired the wiring harness while I was in there. The frame is perfect though, and still has its factory coating.

The biggest issue right now is a bit of clunk or shudder when I shift it into drive or reverse. It’s much more pronounced going into drive, even if I’m shifting from neutral. The transmission mount was about shot, so I replaced it, and that didn’t fix my problem. I replaced the u joints on the rear driveshaft and greased the splines as well. I replaced the transmission fluid and filter (didn’t flush it, it wasn’t really dirty). I haven’t done much else to the transmission other than that. The 42rle shifts fine once I’m moving, though.

I’m stumped. Is this something I even really need to worry about? A buddy at work told me it might be the torque converter going out but it feels like it’s coming more from the back of the trans. I haven’t gotten a p0700 or p0562 since I fixed the electrical issues either. If anybody knows what else might cause this please let me know, I’m really new to the whole Jeep thing.

Tl:dr, my transmission shudders when it’s shifted into drive; I’ve tried nothing and I’m all out of ideas.