Please Help T-case won't shift

[bigcountrysg]

This problem has gone on long enough.

I have several trouble codes to go with this problem.

C1728 T-case unable to shift from 2wd to 4hi
C1729 T-case unable to shift from 4hi to 4lo
C1866 T-case problem servicing required

Now what I have done, replaced GEM, Electronic Shift Module, replaced t-case, none of this has resolved the problem.

I live in Michigan, I really need to get my 4wd to work again. I am on the verge of replacing the hole wiring harness. But I do not know how much the harness will cost. But at this point I believe there is a short in the harness. There for I might has well replace it. Being I can't find the short or broken wire.

[WakemanLM]

go to dealership. You might be able to tear into that harness and fix it. It may be mechanical. Take it in and let the diagnose it. Then if its too much $$$ you can fix it yourself.

Good luck man. let me know if i can help.

[bigcountrysg]

Originally Posted by WakemanLM

go to dealership. You might be able to tear into that harness and fix it. It may be mechanical. Take it in and let the diagnose it. Then if its too much $$$ you can fix it yourself.

Good luck man. let me know if i can help.

Took it to the dealership once last year for this problem. They wanted over 1,000 to just find the problem. Due to having to remove the t-case to inspect clutches.

My original t-case had over 200,000 miles on it. I got a used one for 250 with 35,000 miles on it. It worked for a while and now I am back to square one. I highly doubt it is mechanical.

I know it is electrical. I know this because sometimes my 4wd light is on. Even when the switch is in 2wd.

[bigcountrysg]

mid day bump

[dieseldan2005]

Ok, you and me are in almost in the same boat! MY truck will go into 4hi just fine, but when you go to 4lo the 4hi light goes off and nothing happens. I took it back to the dealer where i bought it because they are the ones that told me it was the t case motor. Well i replaced that and it didn't work. So today they said it was a broken wire in the harness somewhere. I don't know which harness, cause there are 2 going to that motor. The tech didn't really want to show me much when i asked to see. He just showed me the wire that he was tapping into under the dash. So i need to know also which wire goes to the 4lo side of the motor. Looks like we are gonna have to tear into these harnesses.

[dieseldan2005]

Oh and i am getting a P1867 code for contact plate circuit failure.

[bigcountrysg]

dieseldan, I am working on getting the part number for the wiring harness that goes to the trans and t-case.

The dealer I am working with will be contacting Ford in the morning. Seems the price for the harness is about 150 bucks.

Once I get the part number I will give it to you ok.

The harness runs up the frame to the driverside splash gaurd on the inner fender well. At that point it plugs into a connector.

[dieseldan2005]

yeah it is part of a pretty big harness. Mine goes the same way but connects in 3 places i believe, 2 under the brake booster and 1 up to the relays. Well chit for $150 i guess i just might replace it instead of trying to dig through the whole dang thing. I am gonna be one pissed off dude if i buy that and it doesn't fix my problem.

[dieseldan2005]

Another update. I got a part number for it but the guy said that he only showed 1 at the national parts depot. So he said there is no guarantee that it is even there and that ford probably won't make anymore. So basically we fooked and we'll have to find the break and repair it! WONDERFUL! Oh and the price he quoted me was the online discounted price of (are you sitting down) $330.

[bigcountrysg]

Ok update, my truck is fixed. 1200 dollars later but it is fixed.

Wiring that was previously repaired by a shop was all corroded and causing numerous shorts to the t-case. These shorts caused the t-case shift motor to burn up as well. 486 in labor, they charged me 80 dollars an hour labor, and 441 dollars for a new ford t-case shift motor. Oh and two brand new Ford batteries, they said mine were bad.

I know that 1200 dollars is a big chunk of change. But it is fixed.