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Weird overdrive or converter lock out issue? Help!


JOLENE_THE_RANGER

Well-Known Member
Article Contributor
Joined
Apr 20, 2018
Messages
475
City
long beach, ca
Vehicle Year
1993
Transmission
Automatic
Hey everyone. So I’m the new owner of a 1994 explorer limited. It’s all stock and has been a blast to drive but it’s got a weird trans issue
4.0/ auto (A4LD) trans.
Shifter in the first D setting “OD”

If I accelerate on to the highway it’ll shift 4 times and drive for about 20 seconds in over drive. After about 20 seconds it’ll feel like it drops a gear. Rpm will jump up to around 3000 (55mph vehicle speed) and it will not shift back up no matter what speed I go.
Now, while cruising like this, if I shift down to the second D it’ll drop a gear (again?) and rpms will increase again from 3000 to 4000

I’m super confused in what’s happening during the first annd second increase in rpm since this trans is a 4 speed? Probably the torque converter unlocking?

also, a note to add is my cruise control doesnt work. Not sure if related or not.

I need overdrive to work.
Any help would be appreciated!

See pics below. Note shifter indicator position, speed, and rpm.
IMG_5946.jpegIMG_5945.jpeg
 
A4LD's are know to eat lockup solenoids.

3k in O/D at 55 even without it being locked seems a bit high though.
 

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