Little More Information
Hi Niels
According to the MB-C1 Manual C-30, C-60 and C-GT all share the same axle gear ratio 7.16 to 1 so a unit swap should be OK from ration point of view.
What is interesting is the track FRONT and REAR
C-30 Front 70" and Rear70 1/2" Tire Size 10:50x16
C-60 and C-GT Front70 1/2" and Rear 69" Tire Size 10:50x20
But as has been said the best way is going to be to look up the parts numbers for the different units. If you are going to acquire reprints of the manuals, parts book you should also try and find a set of the service bulletins as there is a lot of useful information in those as well.
Service Bulletins -B-62 for example has detail information on spring rates and what is interchangeable with what. One of the things that comes out in that is that the 1941 FAT and all 3 tons had 10 leaves and 1950 Load rating while the 1942 which would be Pat 13 it jumps 15 and 2900. (I'm not sure of the number of leaves at 15 may be incorrect.)
CMPs a lovely jig saw puzzle.
Cheers Phil
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