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Originally Posted by Bored&Stroked
BTW, if you rebuilt it with "newly made" caged roller bearings, that may have been the issue. I do not know of any that are available that are correctly made - the "cages" are not anywhere near the quality of material and heat treat as Henry's originals. Take a fine file and see if you can file the edge of the cages - if you can, don't use them. Then take an original and do the same thing - you'll see what I'm talking about as far as hardness.
I only use good originals or NOS ones (if I can find them . . . hard to locate these days).
Also, the reproduction cluster and reverse shafts are junk - poor materials, not correct heat treat and .001 to .0015 undersize. Folks buy them - thinking they're doing the right thing and yet they are very poorly made. Use original cluster/rear shafts . . . good used or if you're lucky enough - NOS ones (which I haven't seen in years).
I actually made my own shafts for my 39 box in my 32 Cab. I used high-quality linear shafting material.
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I've had pretty much the same issue with those caged roller bearings I purchased some years ago. Lucky for me, I realized just how poorly they were made, and decided not to use them. I was also lucky enough to have a good collection of used original caged roller bearing, and used those.
Two of the best sources I've found for quality transmission parts are Mac Van Pelt and Michael Driskell, @ 3rd Gen Automotive.