this is the one piece drive and trans the out put shaft for the doubled race and 2 bearings . i only remember a paper gasket .been on line looked at many just shows paper gasket.with the cover bolted on i have about a 9 thousand gap between cover and gasket.took cover back off put old race back with cover still gap.now its old case old cover and old race.this is exactly what was in there.still gap.i don't recall a shim of any kind. thanks for any help this is a 1976 borg warner velvet drive