what exactly is this traction device in this dana 60. the axle is from 1972 era. its got 3.42 gears on it. and 5 lug semi floater. this was out of a 72-73 ih travall . kind of like are suburbans. had 44 frt and this 60 rear. had the divorced 205 tcase and is the same frame width as the chevy trucks we run.