1993 Dodge Dakota pickup truck trans problem

The truck has 145K on it and had a new trans put in recently. If I am driving along at a moderate speed (25mph or so) and accelerate the trans skips a bit and the tach jumps 2-3K and then comes back down. This also happens around curves and at high speeds as well when trying to pass.

Any suggestions?

Check the fluid level.

Exactly what NYBo said. With your vehicle on a level surface and the engine and transmission hot, Check the fluid level with the gear selector in NEUTRAL. (Be sure to set your parking brake)