Won't shift into overdrive. Shop told me torque converter and something else and I can't remember second thing. Can you help?

wow no engine size stated, the 5.2L run a special trans... so....
hopeless to help you much.
zj jeep with automatic.
it didnt lie, it told you to service it, so take it to a shop and let the work on this old dog..
stuck , now what does that mean.
the shift lever lever stuck, or its cable failing end to end.? or?
or shifts from 1 to 2 and hangs there.
or down shifts from 3 to 2 and and hangs there
DIY ? question is that it? you never said intentions.....
so we open the 93 ZJ book and what do we see.
ax-15 stick box, seems not.
the aw-4 auto , electronically shifted with TSM (scan it yet?)
and the 46RH auto. used on the 5.2L, has no TCM brain.
its a Hydramatic.
here are the OD words off the 46h page

Overdrive Control Switch
The overdrive control switch is located in the instrument
panel. In the On position, automatic shifts
into fourth gear overdrive will occur. In the Off position,
the switch overrides the powertrain control module
preventing a shift to overdrive fourth gear range.
The switch has an indicator light that illuminates
when overdrive is turned off. The switch also resets
when the ignition key is turned to the OFF position
so that the automatic overdrive feature is restored.
The use of fault codes is employed to help diagnose
the electronic components that operate the overdrive
unit and torque converter clutch.

Sounds like the torque converter is slipping when it goes in overdrive. It is supposed to lock up.

Kinda sounds like it works when fluid is thick and not after it warms up. If it has been awhile since trans fluid and filter were changed it is the most simple thing to change. The torque converter is a big pump, it may be going and not providing enough pressure. This could be checked on most transmissions by a shop expert. Sometimes pressure can be adjusted externally.

I would say torque converter but there are a few thing that control a torque converter the torque on off solenoid switch the valve body in the bottom of the pan where the filter is. The fourth gear shift accumulator. I would start with changing the fluid and filter first and get the system flushed first.

Torque converter is probraly going bad, the automatic gear selector having trouble seeking or going into another gear unless high rpm to select it out to another gear. Could also be your 1gear is getting bad. you may need to take it to the shop as in the long term, it can damage more. You could check to see if fluid is up to level too, as this does happen when it's low in transmission fluid.

Need to verify if its overdrive or the torque converter locking up. If its when it engages overdrive these transmissions are noted for the 4th clutch hub splines stripping out and 4th clutches slipping, Need to verify. Have vehicle checked for trans codes, a code P1811-long shift, max. adapt could be many things. If it just when the torque converter locks up it could be the converter itself or an EPC solenoid sticking especially with a P1811 code. Either way it is proablly handled best by a professional.

Boy O Boy, Don't throw that old trans away, It is most likely OK. Did you change the filter and fluid. A bad speed sensor or a bad torque converter lock-up solenoid will result in a loss of overdrive function. Perform an OBDII scan of the stored faults And look for Speed sensor and lock-up solenoid faults. Watch out for those shops, they will skin you.

i think you answered your own question.. torque converter clutch or overdrive solenoid. also your overdrive band could be a little worn and about ready to **** the bed for good but i'd check the other things. if you had transmission work done on it before when they put the torque converter on maybe it didn't get re-seated properly. push and turn it will click do it 2 more times clicking a total of 3 times

First thing,

lets start with a transmission flush and filter change. then have you checked any of your vacume lines. A bad vacume line is the number one thing that causes any form of transmission mis shifting. When it gets warmed up the lines alow cracks to open up and mess up the function of the vacume line. Also you need to have the torque converter checked. You also need to have a computer scan on the vehicle. a bad sensor or coputer could cause any of these problems.

let me know what happens when you check these out.

your transmission is slipping