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Hey all,

(I've already searched and could not find a problem exactly like mine)

Last summer after a 3-hour long drive in the 90+ degree heat, my automatic transmission would not shift past 2nd gear. It only started happening after I slowed down for the first time after going 80mph for a couple of hours. I pulled into the nearest gas station, let it sit for about 10 minutes, started it back up, but it still had the same problem. After I made it to my destination, I let it sit for about 6 hours before testing it out again. It was fine. On the return trip it was fine too.

I haven't had the problem since then. I want to eventually get the problem checked out to make sure it doesn't happen again. Can anyone diagnose this problem?

Some information that could possibly help: My car has a flaky speedometer/odometer that I have read tons about on various forums, and I know it's either the speed sensor or the speedometer connections behind the guages. Also, I used cruise control on the trip in which the transmission messed up.

Thanks in advance.
 

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Sounds like the transmission just overheated. Very common. Could be temporary blockage of fluid. The cheapest thing you can do that should be done with autotrans periodically is a flush and filter change. 10 minutes is not long enough to dissipate the heat. It may never happen again or might only show up when the temps heat up again.
 

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Agreed with above, also I had added an additional tranny fluid cooler on mine when I was auto. I don't think the rad is enough in extreem heat.
 
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