[Christopher L Cabral]

Hi everyone, Im new to the forum, I apologize if this is posted in the wrong section. So today im driving my 300 and after 5-10 min of driving i noticed that the tranny wont shift from 3rd to 4th gear. It would continue to drive and speed up and the rpms would clime, it isnt slipping but it just wont shift from 3rd to 4th. I shut off the car, started it back up, drove off normal and again after 5-10 min of driving it started doing the same thing. However if i use the auto-stick, it shifts no problem. Please can someone shed some light on this issue before i bite the bullet and take it to the dealership and have em bend me over

 

[rpsundquist]

Do a transmission service,(fluid and filter)Your car has a NAG 1 transmission that
requires the exact amount of proper fluid.This is tricky.I would let a dealer do it.
If that does not fix it.The valve body may have a solonoid issue,or a
transmission remap,may also be needed.