Hey guys, I bought a 2008 Screw, with 78,000 miles. It's a 4x4.

Now I didn't notice this on my hour long test drive but it seems it's happening more frequently.
When I'm driving through town, about 25-30 mph, the truck will rev up to about 2000rpms, and then shift. If I get on the throttle the transmission is very smooth, but it's when I'm coasting/lightly pressing the gas it does this.
I have a 3 month warranty through September so I would like to get this figured out ASAP.
I'm new to the truck world so let me know if this is normal. Thanks alot for any help.

Also, I took the truck to get looked over at the shop down the road before I bought, and he said it was a really clean truck. And it looked as though the dealership had changed the transmissiOn fluid recently? He said the gasket for the transmission pan had been replaced.

 

the tranny sounds like it slipping between 1 and 2 mine is doing that right now im having it rebuilt

 

Thats what I'm afraid of. I guess I should take it in then.