If the transmission is an automatic, the electronic controls or internal problems could be the cause. If it is a straight drive, then the most common cause is a bent or worn shifter fork.
gear oil but not sure how much
The gear is probably worn. About the only thing you can do is either rebuild the transmission or get a replacment.
how do you put gear shift back into 1993 ford f-150 5 speed transmission
yes, its a possible but it depends on the drive train, your gear ratio, and if its an automatic or manual.
There isn't one - it uses a cable attached to a mechanical gear inside the transmission.
On my 1984 Ford F-150, the rod from the transmission to the accelerator linkage came loose.Hooked it back up and it's doing great.
The type transmission fluid for this car depends on the casing. If the casing is aluminum, then use Mercon V. If it is not then 90W-120W gear oil is needed.
buy individual gears to replace the ones that's are messed up
A 5 speed (Mazda built) Manual transmission requires Mercon or Dextron II automatic trans fluid. A 4 speed requires 80w-90 gear lube.
According to the 2005 Ford F-150 Owner Guide : Motorcraft MERCON automatic transmission fluid is used in the TRANSFER CASE
check vacum line to modulator, or replace modulator
Turns out it's the vehicle speed sensor (vss) located near rear of transmission