My 00 monte carlo ss will drive hit first second and wont shift higher first time i tried it hit 65 at 5000 rpm and im guessing went into limp mode i tried to jerk it into shifting higher and it just wont itll go into reverse and neutral just fine it had codes but all engine related that i had since cleared i came back home after about 5 months as i was gone for the military and now it wont even shift higher then 1st my turn signals and overall electric are tricky and kinda funky any idea what the issue could be

 

Gut says you are in for some transmission work. My first recommendation, check and ensure the transfluid is at the right level. If it is, I would suggest finding a reputable transmission shop to address this further.

 

So I have already replaced the filter and fluid I forgot to mention I mean and I’ve rebuilt so far 2 RWD transmissions the fluid was dirty but not terrible and the filter wasn’t terrible either no metal flakes or anything just a little dark like a fresh grape rather then the strawberry goodness haha what parts would I be looking to replace like a rebuild kit or a solinoid kit?

 

Everything. Clutches, gaskets, electronic parts, drive chain, seals, etc etc. It's a ton of labor to pull the trans, open it up and rebuild it. Last thing you want to do is have to do it again in 6 months because you didn't replace one thing.

Id get a complete overhaul kit like this:

https://tripleedgeperformance.com/on...4-0fbe8317e0ba

You may find you need additional parts (hard part damage or out of spec, worn bearing, etc) - but thatll cover all of the basics. You won't know what else you may need until you get it apart and start inspecting.

Unless this is a nearly new trans, I wouldnt spend a lot of time trying to find the specific failed component (unfortunately its not a common 4t65 issue so we can't really pinpoint it without more diagnostic info). They aren't particularly robust / durable transmissions, so if you're cracking it open you may as well get everything back to 100% so you don't have to worry about it again.

 

Sadly, I don't know what needs replaced, I lack enough knowledge on the inner workings of the transmission. If you are comfortable ripping into it, I agree with Bumpin, given the history on these transmissions for problems, I would consider a full over haul, get everything addressed to have it tip top again.

TripleEdgePerformance is known to be masters with the 4t65e in these cars. They have a very good reputation with these transmissions. If you wanted to do a full swap, they would be a good company to consider working with.