47-55.1 Mini-Spool for stock '50 3100 axle?

[Zenwren]

Before ya'll get out the pitchforks and torches, hear me out...

I've got a stock 1950 Chevy 3100 chassis and drive train that has been made into a yard vehicle. No body, just a bench seat and home built flat bed. I take it through some pretty rough terrain and realized the other day I would love a locked rear axle. I know it's a long shot, but does anyone make a cheap mini-spool for the stock torque tube style rear differential? I haven't pulled it apart, but I believe it should have 17 spline axles? I don't know if I've got it in me to just booger a perfectly good differential full of welds.