driveshaft rumbling

[Steve-W]

So I posted this in my build thread, but perhaps this is a better spot for my questions:

situation 1) having driven my C10 lately without any noticeable issues I put it on the lift because of some rumbling sound at a certain speed. turned out my center driveshaft bearing was busted, so ordered a new one from Rockauto, but didn't check any further. So the new bearing comes and when taking off the old one I notice the play is not so much in the bearing as it is in between the bearing and the driveshaft.. so the seat(?) where the bearing mounts is all worn out.
what to do? get a new driveshaft or have it welded up and then machined to the required thickness? (i don't see many driveshafts for sale though)

situation 2) I have the tendency to buy stuff in the spur of the moment, which lead me to buy a 10 bolt G30 rearend a while back. I thought the axles would fit my GM 12 Bolt wanting to convert from 6 bolt to 5 bolt. Alas.. they are a tad longer, but the drums on the 10 bolt are wider as well. I guess I have 3 options here:
a) use the axels from the 10 bolt and transfer the wider brake shoes and drums etc
b) install the complete 10 bolt instead of the 12 bolt, and countering the gear ratio disadvantage by putting in a 700R4 (which I just bought last week)
c) order 2x USA STANDARD GEAR USA21629 1541H Alloy Axle; 30 spline; 30-3/4" long; 5 lug from rockauto. (and still get the 700R4 in for lower RPM at 65MPH)

what's the sensible thing to do fella's?

[mongocanfly]

The driveshaft can be fixed by a competent driveshaft shop....
Youd be better off just buying a set of axles like you want for the 12b

[Steve-W]

Originally Posted by mongocanfly

The driveshaft can be fixed by a competent driveshaft shop....
Youd be better off just buying a set of axles like you want for the 12b

Thanks for the quick and clear response Mongo, I'm indecisive at some moments, so this helps!

[GASoline71]

10 bolt axles in a 12 bolt truck rear end? Use the correct axles. Mixing parts usually ends up in failure. The longer axle shafts will not ride in the correct spot for the bearings and wear all wonky. I purchased a set of Moser 5 lug conversion axles to use in my 1969 housing. They are the correct length.

Gary

[Steve-W]

Originally Posted by GASoline71

I purchased a set of Moser 5 lug conversion axles to use in my 1969 housing. They are the correct length. Gary

thanks Gary, that makes 2 for 2. so ordering new axles it is.

laughed so loud I woke up the kids because of your signature:
OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN