[RodneyB]

Hello,

I have a 99 GMC Suburban LS 4x4, auto trans. I just bought this truck and previuos owner had it sitting for 5 months. I have put 500 miles on the truck.

It shifts smooth as silk when running 20 minutes or less. If I run it longer, I get very HARD shift on 1st and a medium HARD shift on 2nd. Truck has 173k miles.

Trans fluid looks good and does not have a burned smell.

What steps should I take to resolve. Do the Trans coolers go bad and need to be replaced? Do I need to get a trans flush ? Do I ndeed a repair?

Any help would be apprecaited.

Thanks,
Rodney

 

[bigredtractor95]

your valves in the valve body are getting hot and sticking