I recently installed the rear radius rods on my speedster project and the lower bolt on the left side of the backing does not line up with the hole
in the radius rod. I've checked and the diff. housing does not appear to be bent,to only have one bolt not line up would suggest that the housing is twisted like a licorice stick and I cant see that happening. I'm hoping to not have to pull the diff. apart after fighting with the rear spring the first time.BTW I tried a different radius rod with the same results. Fritz
By how much? Is it too far back or forward? What year? Are the front nut(s) loose or tight? Stock or modified? Not sure about 26/27 but you have to take the drive shaft tube off the install the rear radius rods off.
Check to make sure you have the correct year parts for the backing plate.
And sometimes the fork of the radius rod can be sprung open. Check the bolt spacing on each of the forks. The correct install is like Mark posted, the radius rods go in place prior to fitting up the driveshaft torque tube to the rear axle.
When someone doesn't do it that way, and tries to force the fork into place on the backing plate after the drive shaft is bolted up, the forks can be distorted quite a bit. Have seen some heavy hammer marks on forks where shade tree guys got that dang radius rod back in place