Brian, You need to be careful about ordering parts for your diff. I think a 1970 would have the early style bearings and seals (unless the rear had been changed somewhere along the way) as I did with my '69--installing a '73 rear. The early style will have the handbrake cable entering the backing plate at the top. As far as I know you need to order parts as individual pieces for the early type rather than as a kit (more economical) for the later type (same as all 240/260 models). The early type is a little trickier than the late--you use the open cage "nut" bearing retainer to set the axle end play and then lock it in place. If you can "feel" end play - but not "see" it -- that's about right. If in doubt use a dial indicator. -- Dave