Originally Posted by AgTires4295
It's been a couple of weeks. Anything new on this?
I'm having the same exact problem & I'm 99.9% positive I know what your problem is: The boost valve in your tranny's pump is stuck. Also: Check the valves in your accumulators located on the bottom-front of the transmission just behind where your filter mounts. What's happening is there's some gunk in the boost valve causing it to stick open & it's not cycling oil to your R, D, etc.
If you have any trans experience, it's an intermediate skill level job & you'll have to take the transmission out. Otherwise, it's gonna have to go to a good transmission shop & I'm not exactly sure how much a job like that will cost. Let me know if you want me to go through the steps or if you choose the latter. Either way, while the trans is out, I'd recommend looking at some tranny upgrades & you'll be golden.