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I have a 2006 1500 4x2 extended cab w/ 5.3 engine. I use the truck for towing my Jeep to the mountains for some offroad fun. Last weekend while climbing one of the hills, my truck started shifting erratically and by the time I got to the top of the hill I could have the throttle pegged and it still wouldn't down shift. After reaching the top and going down the road a bit the problem diappeared, any idea what the problem was? Need a better trans cooler? All fluid levels were good. Thanks for the help.
Mark
Mark