No heavy duty bands I know of and of the 6 (?) clutch packs I measured only two needed new frictions. The steels were all good. No heavy duty steels or frictions that I know of. It is important to buy the correct “selective” retaining plate to give the reverse clutch pack the correct clearance. Also replace the flimsy OEM snap ring for reverse with a heavy duty one that will not pop out like the original.