1963 17 spline to 30 spline questions, is this such a unique diff?

[Jeremy 63]

Hey all Chevy fans,

For the past few months i have been recieving much information regarding my diff. The truck is a 1963 Chevy LWB C-10 2WD 1/2 Ton. The diff in question has the following markings:

GM4 - 12 Bolt
3.73 ring gear & pinion
Diff Date: F133 = June 13, 1963
Diff Nr:*3838227*N
Spline: 17
Pressed on backing plates, not bolted on (with 4 bolts).*

From the information that has been gathered, many people, along with companies have told us that purchasing 30 spline replacement axles for this rear end will be virtually impossible due to Chevy only making this rear end from 63 to 64.

I know we have to stay with 3.73 gear and pinion because of the housing.
I would like to change from the 17 spline axles to the 30 spline.
Since the rear is completely disassembled, I am also wanting to change to a posi track or locker rear end (nobody makes a posi or locker for 17 spline axles). I also need all the bearings and seals, plus a new 3.73 ring and pinion set.*

Is it possible to find 30 spline axles for this unique differential?

Any help would be greatly appreciated.
Thank you in advance.

Jeremy Franklin
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