I just bought this truck and was going down highway about 65 with cruise control on and lost power like something not catching and sat there for a while until I found out I had fourth gear only could this be something simple like a pin
My car has 150000 miles.
My car has a manual transmission.
There could have been something that went wrong with your transmission. Try driving in 1st, 2nd, 3rd, and reverse to see if the vehicle will move. If the vehicle only moves in 4th gear, then the counter shaft has burned up all of its teeth. 4th gear is straight through the transmission and not using the counter shaft. This gear is a 1 to 1 drive from the engine to the driveshaft. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transmission.
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