matching diffs

[Vic Eaton]

HI ALL OUT THERE
Can any one advise me on the following i have just dismantled two axles to extract the diffs i need one for the radio truck you have given me advice befor on matching diffs well all the years i have had these trucks i have never seen inside a diff as chris vickery told me , divide the teeth on the pinion gear by the teeth on the ring . fine . but all i can see is the ring gear what else do i need to dismantle to see this pinion gear .
regards vic uk.