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...

Full floaters arent gonna give you a bigger ring gear, tho... (i know you didnt say it)

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim