u-joints or transmission?

my truck will go into reverse just fine while backing out of my driveway but when i put it in drive to go, it acts like it wants to go but just revs up! then it kind of sounds like it breaks lose with an awful sound and then starts to go.

 

Trans

 

Not your u joints!! How's the fluid lookin?

 

Stuck rear brakes? Will it roll if you put it in neutral and push?

 

the fluids fine thats the first thing i checked! and once im going it shifts fine, the problem only occurs when going from park to drive.

 

If you go from park to neutral will it roll easily?

 

Defiantly not the universal joint .

 

Brake or trans

 

If the vehicle is moving when you do it, it could be the torque converter. Just one of many options.