You can't say that one year or the other will have the dangerous rims that are split in the middle, So far I have seen them on a number of different years, and just as many if not more trucks of the very same years have the OK lock ring wheels.

Check out this Tech Tip: http://www.stovebolt.com/techtips/wheels/
It has some good info on wheels, including pictures of and info on the different types.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-