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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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If you apply a little outward pull or leverage to the axle, does it move?
Can't tell exactly from photos but the axle may not be fully seated?
They look like they're out a little to me.
It takes quite a bit of effort to get them fully seated over the internal c-clip.
They should not move at all.

There is a c-clip on each end of the mini-splined shaft.
It doesn't matter which end is seated first when you re-assemble, but both ends must snap firmly into place. I had to pound mine in with a fairly large sledge-hammer.

I assume you have installed new seals.
 

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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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5,998 Posts
If they are moving outward, then I believe they are not seated.
They snap firmly into place.

I don't think you can set these up on a bench, not sure.
Also if you've moved them outward (testing them) then they again are no longer seated.

Again, both ends of the mini-spline shaft have c-clips, including end that connects to cv-axle.
None the less.. most of us hammer the entire shaft inward during reassembly.
I don't know what else it could be unless seal is damaged.
Driver side is tricky (regarding seal) because of the differential plate.

Note: put the old nut on the threads and whack that, rather than the threaded shaft directly. You should also be driving it in as straight as possible. I held my shaft in place with straps when hammering with sledge hammer.
 
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