I am working on my buddies 94 ford ranger it starts and run strong but we can not get it to move at all the reverse lights come on and we rev the engine but it does not move in neutral or any direction it is stuck we checked brakes but nothing we got the truck from some kids who put in a transmission in it not sure if the hooked it up right

 

Does the truck roll?

Manual or automatic transmission?

If automatic and this was the first time "the kids" installed an automatic then they most likely broke the front pump inside the transmission, so trans needs to be pulled out and repaired, full rebuild to replace the pump
Check transmission fluid level engine OFF, then check it engine running, if level is not lower with engine running then pump is broken
I did this on my first automatic install 40 years ago, expensive lesson

If manual trans its very common to install the shifter incorrectly so trans is LOCKED into a gear and can not be shifted, but vehicle shouldn't roll, if this is the case, and engine should stall when clutch is let out
Pull out shifter arm, manually move the 3 shift rails to center(neutral) then reinstall shifter arm

Longshot
Transfer case has been shifted to Neutral
Pull off the electric shift motor on the back of transfer case
The shift rod has a triangle shape, it should be pointed at 2H, like this: https://www.therangerstation.com/tec...ft_motor-2.JPG

If its pointed in exact opposite direction, thats NEUTRAL even though its not marked

 

The truck does not roll at all we put the truck in neutral and tried pushing it down the ramps it is on and with three of us pushing it would not budge one bit it is an automatic with 4 wheel drive