448,000 on my stock Tranny. Temp gauge hits oper temp at start up

[BryanH]

I have been pushing my tranny farther and farther and I think this past haul Miami-Minn,Mn- Lake H, AZ-Home (San Antonio) in 7 days put me to the end. It started grinding over 65mph and when you let off the pedal it grinds to a stop. I let the truck cool off for an hour and the noise is gone. It started up again on my way home after 2hrs of 70mph in mountains (empty). I get home and I notice the temp jumps to operating temp at start up. That is my question.
I know it should be dead, I know it has alot of pulling miles, I know it's worn out but I need this to stay together for another 6-8k miles or 3-4 weeks. I am just wondering if anyone knows about the temp gauge.

[lariat 7.3]

aftermarket temp gauge or the dash one? the dash one is just a dummy gauge

[BryanH]

It's just the dummy gauge, I think it's a sensor telling me something

[BryanH]

[QUOTE=lariat 7.3;2799298]aftermarket temp gauge or the dash one? the dash one is just a dummy gauge[/QU
The dash gauge is what I am talking about/.

[blue72]

Off topic but,....... how in the hell did you get 448K out of the stock tranny? Have you had the truck since new? What is your secret?