I have no experience with this...
If I recall from 5 years ago while on a road trip through CA with my 52 when I met a guy with a 1/2 ton with T-5.
While I was looking at his truck, he explained that he used the cross-member from either the S10, or was it an Astro van? and the driveshaft from an Astro van. Supposedly the cross-member fits inside the frame and holes can be drilled to bolt it in, very little work.
Take this as a suggestion that a stock later model cross-member may fit, as again I have not done this.


Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-