Granite Granite 3s blx - - Rear wheels not engaging with any torque

[Nsrg]

Hey all, for the problem above I notice the truck grinds on acceleration and can't wheelie despite traction, the rear wheels spin when I lift up the car but not against any real resistance.

I can't figure out if I'm stripped between the clutch spur gear and the differential, or somewhere in the differential? I'll post pictures of the interface between the clutch spur gear and the differential, it doesn't look perfect to me but I can't tell if it's worn enough that that's the problem? Just trying to figure out what part to get and not eager to take apart the differential to explore it if I don't have to.
Thanks!

 

[Johnny b]

Check your slipper clutch. It may be to loose.

 

[Rowdyray]

Look through the window (bottom) of the power module. You're holding it. Is the plastic spur stripped? Is the pinion engaging with the spur? Open it up and see if the slipper clutch has loosened. That is the easiest of things to check.

If all of that looks good, it's the diff.