Synopsis:

I own a 1993 4Runner/AT/2WD/V6. The truck is all original with 156K on the engine and AT. I decided to change the ATF with some 75K and up ATF, but when I did so the AT wouldn’t shift in to any gear.

Steps I took to change the ATF.


Drained the old ATF via the AT pan located directly behind the engine oil pan.
Once drained, I plugged the AT pan and added two quarts of 75K & up ATF via the dipstick.
I didn’t change the filter or pan gasket. I didn’t remove the pan at all.
I started the truck up and allowed the engine to warm up.
I shifted in the reverse and gear didn’t switch.
I shifted in to drive and the AT shifted but I had to apply more than normal RPMs to drive.
So, I added two more quarts and now the engine doesn’t shift at all. I don’t feel or hear the shifting and it does move in any direction.

I have no clue what has happened. Maybe the filter is clogged? Any ideas?

you might have broken all the gunk up in the tranny when you replaced the old fluid with new sounds like the pump went out in the transmission i just recent replaced my transmission bc the same thing happened it acted like it was in netrual or could be the vavle body on the tranny i would take it to a good shop to diagnais it for you b4 you buy a new one