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Overdrive in M715?

4352 Views 14 Replies 9 Participants Last post by  Mikel
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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you can build a dana 20 with dana 18 guts and get an Advanced Adapters kit to make it a divorced t-case like your np200.
you'd end up with a 2.46-ish low. then you can drop your gear ratio to 4.56 and not loose much in the way of crawl ratio. I'd question the durability of anything less than an NP20x series tcase or an atlas in that thing. seach in here on "O'brien gears" I think he was working on a 3:1 gear set for a np205, but not sure if it was ever done, but it'll co$t.
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