Hey guys, I'm lookin for a B-body differential guy in the DFW area. I have a 68 Coronet with a 3:55 sure grip 489 under it. I replaced the pinion seal,tightened everything back up about a month ago.Everything was smooth until I noticed a whine coming off the freeway here in Mansfield last Friday nite. Jacked it up tonite, dropped the drive shaft and checked the fluid and then the yoke to see if there was any slack.Fluid aok and No slack. But noticed a roar coming from the rear end as I turned the wheels FORWARD by hand. Smooth as silk and no noise whatsoever if I turn them backwards. But have this mild roar as I turn them forward.
Does anyone know someone that properly diagnoses AND works on these in the DFW area?

 

I would think in the DFW Metro area there is going to be numerous shops that can 'fix' your problem, but I would bet that your "tighening" everything back up is a different spec than whats needed. If the rear uses a crush sleeve its a guarantee that its now different. I would find a driveline shop pretty quick to address the issue and fix.... Otherwise you will end up with a whine no matter what you do...