I have a 1969 M715 for which I'm building an Olds 455. I plan on driving the truck as a semi daily driver but don't think the engine is going to like the 5.88 gears. I was thinking of regearing to 4.56, but I don't want to lose my crawl ratio. I've been going through the archives and it seems that there are several overdrive units, such as the AA Ranger or the Warn overdrive. Will these work with a T-98/NP200 combo? Any other alternatives? Is a 4:1 gear set available for NP205's?
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