Replaced solenoid, now new transmission codes

[vandyboy]

About three weeks ago, my '05 Liberty with AT wouldn't shift into third gear. All I had to do was turn the car on and off. Last week, this happened again, the engine light came on and it was stuck in limp mode. I pulled the codes and they showed I had a bad solenoid pack. I replaced it, the transmission shifted fine for two gear cycles and then back to the engine light and limp mode. Now my codes are 733 and 734 - out of gear ratio for third and fourth gears.

Has anyone had this problem? What could possibly cause these codes? I hate to say this, but I think the transmission needs to be rebuilt.

 

[LibertyTC]

Yes it does sound like a rebuild as clutch packs are probably worn.
How many miles on the trans now?

 

[vandyboy]

It has 145K.

 

[HoosierJeeper]

Take it to a transmission shop and get the Clutch Value Indexes read, that'll tell you the exact condition of the clutches.

 

[vandyboy]

Will do. Thanks for all the answers.

 

[vandyboy]

By the way, is there any use in replacing the speed and pressure sensors before giving up on the current transmission?

I have access to an 07 AT Liberty transmission. However, it has an outside neutral safety switch and my friend believes a different wiring harness. Does that sound right to you and would it work in an '05?

 

[HoosierJeeper]

I think 07s had variable line pressure as well, which an 05 or 06 would not.

 

[vandyboy]

Does that mean I cannot install an '07 Liberty 42RLE transmission in an 05?

 

[HoosierJeeper]

I don't think you could but I'm not 100% sure how that system works and if you could disable it/convert it easily.

 

[vandyboy]

I don't think you could but I'm not 100% sure how that system works and if you could disable it/convert it easily.

Thanks again for your help. I have called a local Jeep dealer to make sure the '07 transmission in can be swapped to an '05. I found out from the service writer the '07 transmissions are 42RLE VLT.