Originally Posted by Denny Graham
Been tryin' to figure it out but ya got me stumped cuz I'm not
a texter....what is MPC?
MPC stands for "Master Parts Catalog" Don't feel bad, when I 1st saw MPC I was stumped for a couple days.
U-Joint Illustration link from 1929 - 1957 Chevrolet Master Parts & Accessories Catalog on http://chevy.oldcarmanualproject.com/ Website.
The text on the page from chevy.oldcarmanualproject.com was not very clear so went to
This Page and This Page ---on--- http://www.gmpartswiki.com/browse and screen shot a close up and uploaded on my Photobucket Album.
The reason: www.gmpartswiki.com/browse is not very quick at loading pages sometimes, but the text is sometimes clearer.

Originally Posted by Achipmunk
DG, I think MPC refers to the Master Parts Catalog.
Correct.
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I would say This picture (scroll down) of the u-joint assembly shows the bushing type bearing.
Read under "Universal Joint" It says 'using bushings in place of needle bearings'
I think most of the bearings I have seen were of the Granodized Type.
Pic 1
Pic 2
Pic 3
Pic 4

Denny Graham,tclederman and Uncle Brad thanks for the Granodized Trunnion bearing explanation.
Pretty much clears up that mystery.

1954 Chevrolet 3105 Deluxe Panel Truck
w/Factory HYDRA-MATIC