I don't beleive there is a kit for your '38, but a similar approach to the kits made for '47 to '54 trucks might work. I paid $40 at a u-pull-it for the right power steering box to make that work.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...