not necessary .. Toyota rear axles are larger then chev 1/2 ton ..

buddy had a 327/350hp in his rig (almost beat my Vett in a race ) ..stock toy axles and 36" swampers .. never a problem .. and I'm NOT that aggressive .

besides .. this rig is NOT a rock crawler , it will be a DD /tow rig , as I have stated !! <img src="/forums/images/graemlins/cheers.gif" alt="" />

Shaft diameter, perhaps, but not ring gear side...

Brian K. Gallus
I have nothing important to say.