modulator valve on the transmission.
on the bottom of the transmission
The shift motor on my 1996 Ford Explorer is located at the end of the transmission, around 1/2 way back on the left side of the under carriage. May be in the same spot for 02 models.
electronic solenoid
Mounted on the steering column.
I believe it is on the passenger side of the transmission ( A4LD ) behind a heat shield
my 2001 ford windstar wont shift out of first gear.
Possibly low fluid.
A bad transmission gear can cause your 1999 Nissan frontier to shift hard. Low transmission fluid can also cause the transmission to shift hard.
neutral safety switch is on transmission just below were shift cable connects to transmission
Transmission reProgramming required. The trans doesn't shift into 1st gear at the correct speed and causes a jerking of the vehicle when approaching a stop
There are several causes that an automatic transmission will not want to shift into second gear. The two most common causes are transmission pump issues and trouble with the vacuum modulator.
A seized up transmission can cause a Volkswagen Golf with an automatic transmission to not shift and racing RMPs after second. A worn gear can also prevent shifting.