Big Tee, I don't trust Chevies of the 40s. Here's why. When I converted my '36 Chevy Pickup from 4.11 to 3.55 gears I used a '37 Chevy car rear axle because it is the correct width and will take the 3.55 hypoid gears that were in some Chevys in 1950-54. While I had it apart, I replaced the seal at the front of the driveshaft/torque tube. The required seal has an ID of 1 1/32" (1.031).
Chevies of the 40s claims to have the proper seal for that application. I contacted them to verify the dimensions and when I squeezed them hard they told me the seal they are selling for '37-'39 Chevy applications has an ID of 1 1/16" (1.060). An incorrectly sized seal should not be offered to the unsuspecting public.
I found it unethical of them to try to withhold that information, particularly because it is a huge project to change that seal once the rear end is completed and installed.
I did some research in a seal catalog and found a double lip seal with the correct ID and got it from a local bearing supplier.
Buyer beware!
