They put some special c-clip Eliminator bearing in it which required a retube with special housing ends. Used a trutrac diff. Apparently you can use 8.75/Dana adjustable bearings with custom tubes also.

'72 Scamp, 3500#, 440, S400, blowthrough, meth. inj. 9.78 @ 139 so far at 12 psi, 11.00 @ 131 on real street tires.