1948-51 Clutch Minor & Major Service Operations
Read:
Under Minor service operations: Clutch Reacting Springs
Read:
Under Major service operations: 1. thru 5.

Troubles and Remedies page 1 scroll to bottom of page.
Troubles and Remedies page 2

1948-1951 Chevrolet Truck Shop Manual, Definition of Rattling or Grabbing might mean Shutter.

I had a 1982 Honda Accord with a bad clutch.
After installing a new clutch it started to shutter.
It turned out the passenger side control arm Ball Joint was bad, causing the wheel to shutter.
It certainly felt like the shutter was coming from the clutch.
It had front wheel drive.

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