I got a 02 f150 4 wheel drive engages and disengages like normal but the passenger side send to lock up and grind and if rolling in 4 wheel the truck well come to a stop because of that grabbing . need help first time owning automatic 4wheel drive. Doing know what it could be

 

I want to help you but Im having a hard time understanding whats going on.

 

Also not sure what you refer to.

If you engage 4wd on dry pavement, you will experience binding if you turn wheels and move. Or even on firm ground. The turn radius for front and rear axles is different, and that causes the binding in the drivetrain. 4wd is to be used where wheels can slip and rotate at different speeds and relive this. Fancy vehicles with AWD now have a center viscous coupling which allows this normally, and locks up when relative speeds are really different due to slippage.

Could this be situation?

 

Basically I put it 4 wheel drive , driving straight no turning and after about 10 yrds or so the truck binds up and comes to a stop. If I put it in reverse and back up the same distance there is a loud pop.

 

It sounds like your cv is shot to me. Buy cardone cvs from rockauto and save $200 and do it yourself. Its a 2 hour job the first go around.

If you want to test it undo the side toward the center section and just allow it to sit on the control arm. If it still binds after that then you have bigger problems.

 

Front CVs always turn, 4 wd or not. It would have to be in the differential or transfer case.

Does it have stock size tires?

Some people will put oversize tires on , like 35's, and only re-gear the rear end, figuring to only use 4wd when mudriding or something. Its a bad idea. Or decide to sell it when they cant find the right gear ratio for the front, or see the cost because it only comes from ford.

 

I know they always turn but im thinking if one is busted on the inside when power is put too it thats what causing it to bind. I was hoping for the least expensive way out.

 

When my CV's were bad they would bind much more when they were under power.

 

Makes sense, and much easier to fix.
Can even get parts from junkyard.
If quick enough

The vehicles at a pullapart near me get stripped by people selling on ebay, as well as by the yard employees, pretty quick.
In no time at all, vehicles are crushed and replaced.

 

Sounds to me like you're on pavement, or your front tires are a different size than your back tires, or the front and rear diff have different gears. Someone may have just swapped the rear gears for more power (with or without bigger tires), or the PO (or maybe yourself) had a bad front or rear diff, got a junk yard one, and that one has different gears than what's in the other axle.