Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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With the rear tire/wheels off, & rearend hanging in the car, I would remove both rear drums, then remove both rear axles. Examine both axles, its a good chance the axle side that is wobbling has a bent axle flange & that axle will need to be replaced. At that point, one needs to double ck what the rearend is. Many have been swapped out over the years. If the rear is an original Pontiac 8.2 HD Safe-T-Track rear, it originally had HD axles. Scott (69BlackJudge) had a pic up on the PY Forum, I believe about a week ago, of a pair of '68-69 HD STT axles he was offering for sale, maybe he can chime in with a pic. The HD versions are very very hard to come up with. Like the standard duty axles, the HD versions can also suffer from a seized axle bearing. Typically, when I've come across a chewed up early HD STT axle in a build or maintainance session, I just order a new pair of Moser axles. Mosers are far superior in strength to the value priced chinese junk axles avail from Internet sources.
Sealed axle bearing axles were used by GM in all '64-69 Pontiac A-body's, as well as Pontiac B-body's which ran sealed axle bearing 8 7/8 P series rearends up through the '70 model year. Sealed axle beings are NOTORIOUS for seizing & chewing up the axle under the bearing. When it comes to replacement, the RW507CR sealed axle bearing is one of the most affordable of sealed axle bearings, not like the original sealed axle bearings in early Olds VistaCruisers or '68-69 GS Buicks. Many many times I've replaced unknown usage 507CR's on friends & customers recently acquired Pontiacs which still had their early original 8.2 bolt-in axle rears, definitely gives peace of mind. Very gut wrenching to get a parts request/ or pics of really nice Pontiacs & Olds with a damaged 1/4 panel, after a chewed up axle decided to slide through the locking collar & depart the car. This typically occurs during cornering. All GM A-body rearends with bolt in axles received tapered bearing axle retention (with an external axle seal) for the '70 model year. Tapered axle bearings are the best for heavy side loading & rarely fail.
Last, on nice used (cked out axles) I'm either using in a build, or preparing to ship out, I nearly always replace the wheel studs. Too many 45-50 year old axles have really poor condition axle studs.