About 3 weeks ago I was stuck in some mud, and I revved the engine, in Drive at 0 mph to get out of the mud and the truck reached about 3,000 RPM and then the check engine light came on. Code p0748.
Fast forward, I dropped the transmission pan, and the transmission fluid was very dirty. I knew that and hadn't been changed for about 5 years or about 35,000 miles.
In the bottom of the pan was a broken piece of a ring, which I've narrowed down hopefully to being overdrive clutch assembly? Ring or snap ring?
The truck has code p0748, which I've looked up and says Governor pressure solenoid. I bought a new governor pressure solenoid but did not install it when I had the pan off because I saw the broken piece of the ring and figured maybe there was a short in the valve somewhere.
I know I could have put the solenoid in to see if that would have fixed it, but with the broken ring I figured the solenoid was probably okay.
Upon a little bit of research, if it is the OD clutch assembly ring? Not sure if that's the proper terminology, I think you can repair it by taking the overdrive assembly off of the back of the transmission.
In which case and if it is this particular ring and the rest of the transmission is indeed fine, I would like to go this route. I'm looking for some help to clarify what options I have moving forwards.
When I took the transmission pan off the fluid was dirty, but it didn't smell burnt, and there were no metal shavings whatsoever, on the magnet, or in the pan, only the broken piece of ring.
I put a new filter and transmission fluid in, so the truck currently has fluid and is drivable in limp mode. If you put it in Drive it starts in third gear, then seams to shift 2nd then back to 3rd as you accelerate, but stays in third.
If you start it in 1st gear manually and shift up to second, then drive its smooth and fine. Drive still stays in third though. Stuck or shorted valve cause of broken ring?
So, I hope the rest of the transmission is sound.
I'm hoping to be able to just fix this one part and get myself back on the road. I'm a gardener and use my truck to make a living. Thank you for any help.
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Friday, January 14th, 2022 AT 3:19 PM