Trans slips in 1st gear, 1997 ax4n trans, changed fluid and filter

SOURCE: A4LD 4X4. trans. wont engage into gear

It grinds just sitting still? Will it do it with the transfer case in neutral or 4x4?

SOURCE: transmision ax4n not working

Possible bad valve body in transmission or a clogged transimission filter. The only way to check either is to pull the transmission pan.

SOURCE: 1995 ford f150 4 x 2 4R70W auto trans won't shift

check vacuum and electrical connections

SOURCE: Shifts hard and jerks under hard acceleration.

thottle positioning sensor? if trans has overdrive could be a lock up piece, dont remember name of it. there is a lucas oil product that might help. if it is the overdrive.

SOURCE: 1997 ford taurus 3.0 ltr trans wont shift into

Solenoid pack in trans. Position module,is just that. Wrong guess. What tran model do you have? You also have other sensors to consider but have to know the trans your working on and the computer and shift stratagy involved to solve this,even if your throwing parts at it.