Chech ALL vacuum hoses. The tranny shifts by monitoring vacuum pressure.
could be a worn pinion gear or bad U joint or both
The first cause of the jump out from one to other gear is the loose shifter fork, which connects the shifting linkage and gears of the transmission. The second cause is loose shifting linkage itself, which connects the gear shifting knob and shifting fork. The shifting linkage and shifting fork become loose due to the rapid changing of gears from one gear to other at high speed of vehicle. The third cause is the misalignment of shifting linkage to the shifting fork.
try a new gas filter try a new fuel filter
That is the button that changes the shift points and hold points on your transmission gear shifting. pwr is for more aggressive driving. down shifts quicker and holds the gear longer in the rpm band before shifting to the next gear....or leave it off for normal driving for economy. Jeff Fort Worth Texas
Take it to get the gearbox replaced.
If your transmission is not shifting into third gear and overdrive it could be a parking pawl. This prevents the transmission from rotating.
The car isn't necessarily shifting into neutral its just staying in a lower gear and not shifting to the next gear, check your transmission fluid.
gear and clutch relation _ when clutch is disconnect this time gear shifting thats relation
When shifting a manual (or standard) transmission on a vehicle, if you hear excessive knocking noises immediately after shifting, you are probably:1) Shifting into the next highest gear too soon, or2) Shifting into the wrong gear - for example, going from 2nd to 4th gear, or3) Not running the engine fast enough after shifting to the next highest gear, or4) Your engine is out of tune if you know you're doing steps 1,2 and 3 correctly