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Not yet. With the help of another guy near me that knows the transmissions pretty well we were able to troubleshoot it being a mechanical issue likely a stuck valve in the valve body. I'm waiting to get into a heavy diesel guy near me because messing with the valve body is a bit above my pay...

Awesome, thanks! You saved me a bunch of time opening a few hundred disjointed pdf files I have saved. Hopefully this is it!

Good thing to check out. Do you happen to have the TM chapter of the adjustment off the top of your head? The power fade 100% feels like just because of it being in way too high of a gear.

Ok, so I measured the temps of everything now that I know the IR gun works. At start up the gauge reads 150 and the pan, tranny cooler, engine block and radiator reads 100. After driving around a bit I got the gauge to read 270 before the loss of power. I pulled over integrally and the...

I appreciate the help. I'll test a few things out today when I can break free.

Awesome, thanks man! I'll verify my IR gun today. If the gun is reading right and the gauge is showing 275 but the gun is showing 170 at the pan and transmission case, could the temp sending unit being bad cause the transmission to shift early like it seems to be doing?

Gotcha, I'll see if I can put a test port on there. What do I put on that test port to measure the pressure? I know if I crack the sample valve on the oil cooler it sprays oil like 10 feet, but I can see what you're saying about pressure being different at idle and driving.

When I pull off, I usually let it idle for 5-10 minutes until the temp is 225 and then I'll shut it off and wait for it to cool down. Usually 35-45 minutes will get me back down to 150 ish and I can get going for a few more miles. Are you referring to the water pump pressure to circulate the...

I might have it, I'll check and see if it's in the trash still. What would I be looking for? When I let things cool down everything works as it should until the temp goes up over 250. I'm not losing gears, I can feel it shifting through them, but when it gets hot it shifts through them way...

I'm at my wits end chasing this down. Any help or suggestions would be welcomed. I drove my M925A2 home back in May. 330 miles went off without a hitch, but with 30 left the transmission was getting up around 275 on the gauge and it was shifting way early, bogging the engine and doing the...