RE: please take a look
You need to figure out where in the drivetrain it is slipping. When you give it gas:
Is the flywheel spinning?
Is the clutchbell spinning?
Is the spur gear spinning?
Is the topshaft spinning?
are the outdrives spinning? One or both?
are the driveshafts (dogbones, cvd's) spinning? One or both?
are the axles spinning? One or both?
are either of the wheels turning?
You need to go through these questions with the truck off the ground and on the ground. This will tell you where your problem is.