Hi recently my car was sitting for a few months and I started driving it again a couple days ago but yesterday shifting to 3rd gear was rough and I heard a weird sound and the transmission service urgent light came on as well as the check engine light I got the codes pulled and will leave them below I just want to know if there’s a simple problem that would cause this, if I need a new valve body, or if the codes are major and I should order a used tranny today.
Po700- transmission control system(malfunction indicator lamp request)
Po751- (shift solenoid a performance or stuck off)
Po733- gear 3 incorrect ratio
Po734- gear 4 incorrect ratio

Any help is appreciated Also it’s the non turbo version

 

Those codes mean a speed sensor is picking up a different speed than what it expects to see. Usually because clutches are slipping.

 

sorry if I don’t understand I’m new to all this so this would mean I need a new clutch and that the slipping clutch could be triggering the transmission light, or that I need a new transmission and clutch put in?

 

There is a clutch for each gear in your transmission - they might be slipping in 3rd and 4th gear. The solution is usually a rebuilt transmission. The General Motors transmission in your car (04 2.9 6 cyl) has been used in many many cars and is not really known for longevity.

 

hi do you know the exact part number or name for the transmission, I looked online but it’s hard to filter through to find the exact one since I have the fwd non turbo model

 

https://en.wikipedia.org/wiki/GM_4T60-E_transmission

 

thank you a lot I fr appreciate it