Well this morning went to put my truck in reverse and it wouldn't go any where the engine rev'd up like it should. So after a push I got it out on the road put it in drive and it slips hits second seems fine hits third slips and goes into fourth I think when I go down the highway the RPMS bounce as if its slipping for a split second then catching itself please help me what could this be

 

I should add that I have a 2000 blazer Zr2

 

Fluid level good?

 

This may help FYI 4L60E common problems / failures | GM Truck Headquarters