Can be done....but.....
HI John
The tranny swap can be done.... the big problem is that the 420 is much longer and you will have to spend $$$ to get a custom made very short drive shaft to link up to the Transfer case..... or move the engine forward or move the T-case and cross member backward. The original CMP 4 speed is incredibly short by todays standards.
Some additional problems maybe encountered when you install the emergency brake lever... it will probably bolt right on but be in a different location that will not match the floor opening.
Which CMP model are you working on..... C15a would be easier than the C60 because of the different system for engaging the front axle which bolts on the tranny for the C60....
Bottom line anything can be made to fit if greased with enough $$$$$
I had original plans to install the 4 speed that came with my 261...fully synchro.... would have been a dream...... gave up and went back to the CMP tranny to avoid all the headaches...
Boob
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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