the synchronize in the transmission is bad, that why the jumping out of fifth gear
The shift censor may be getting weak. Also the linkage may be broken on the transmission between fourth and fifth gear.
It's the 5th gear synchro. Trans rebuild
problem with your transmission in 5th gear
There is no drive in a standard transmission car. In most cases you will have reverse, neutral, 1st gear, 2nd gear, 3rd gear, 4th gear, and 5th gear.
Ford 5R55S Automatic 5 Speed Transmission 1st gear 3.22 to 1 2nd gear 2.29 to 1 3rd gear 1.55 to 1 4th gear 1.00 to 1 5th gear .71 to 1 (This is a late model Ford Mustang Transmission) * not to be confused with 5R55E, 5R55N, 5R55W they have different gear ratios
Basically it is 5th gear in this transmission. With overdrive on, it will allow the transmission to shift to 5th gear, which will let the truck move faster with less engine rpm's. More fuel efficient. If you are towing or hauling a lot of weight (over 1000 pounds), it is better for the engine and transmission to turn overdrive off.
car can be started an does run fine.
Check your transmission fluid levels first
take tranny apart and replace 5th gear syncro
if 1st 4rd and 5th and reverse do fine, it would have to be in the transmission. clutch problems are noticable in all gears.
your syncronizers in the transmission are worn out in 5th gear. there what make the gears line up in speed so you can change them smoothly