68 GTX Rear Axle Bearing Help

........68 GTX rear end in it...…..
If it's a true '68 Plymouth GTX rear end assembly I would think it's either an 8-3/4" or Dana 60.
In some cases the axle can hang on the bearing retainer studs. Make sure you don't bend the retainers up due to it hanging on the studs. Support the axle on removal so you don't damage the inner axle seal.
If it's an original 8-3/4" with the tapered bearings then you'll have side adjustment. The tapered bearings also need to be greased prior to axle install.

Is this the one then without buttons.

I believe these "buttons" would be on the clutch type sure grip unit and is necessary for the stock axles to butt up against when using the standard tapered bearings.

Clutch suregrip unit (or do you say "posi") with buttons removed for "green" bearing use...…
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Here's a post that may help...…..
https://www.forbbodiesonly.com/mopa...ter-diff-swap-whats-up.125064/#post-910600833