89 F150 Aod - Ford Forums

08-15-2003, 05:15

I have shifting problem on 89 F150 302 AOD. When going into OD, there is a hesitation and then it will "slam" into OD with a shuttering bang. I've replaced EVERY sensor,new plugs/wires, replaced torque converter. Upshift is smooth. Downshifts fine.

big1 · 08-15-2003, 09:40

If it up-shift's and down shift's fine where's the problem? If it's only slaming in OD try adjusting the TVA cable? it may help.

08-15-2003, 10:30

The problem is that it "slams" into OD. I've adjusted the TVA cable and it did not correct the problem

89F150 · 08-16-2003, 04:19

The tV wouldnt have anything to do with it if its shifting fine in reverse and into drive. The Throttle V alve linkage needs to be adjusted when the trans downshifts too much or at the wrong speed. I'm just guessing here, but arnt the gears controlled by valves? If so the valve controlling OD could be sticking or something.

89F150 · 08-16-2003, 04:23

Also, do you have any photos of ya truck. Post em here if ya do. For some unknown reason i like 89 model F150s.

big1 · 08-17-2003, 08:04

Thank you "89F150" for your correction. Your right, the OD is controlled by a solenoid. It's allowing the line pressure's to get to high prior to the shift. It's an easy fix, if you've done tranny work before.

08-17-2003, 10:42

THANKS Big1! Now I have to find somebody around here to check into it.