Looking at the ratio is there a real advantage?
I don't have the ratio for the different boxes in front of me but years ago I discussed this with a CCKW expert (define as anyone who is crazy enough as to own ten or more CCKWs) at the time he and I were both running stock engines. We did a lot of traveling together here in New Hampshire (lots of hills) and neither truck seem to have a real advantage in speed or hill climbing. The four speed vs the five speed just meant that we shifted gears at different points.
So before the effort of changing the gear box take a look at the ratios. Some place I have an RPM vs torque curve for the CCKW engine and the 216 which would also be interesting to compare.
My CCKW expert said what you really want is a box with a 5th over. I'll send him this thread and see what he has to say.
Cheers Phil
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