There is also a lot more heat generated in the rearend with the low ratios. The heat problem with 3.90's and lower wasn't much of a factor with the old Muncie because we worried about what the extended term RPM was doing to the engine. While we might have bumped speed up for a few miles with the lower gearsets, we didn't get on the freeway and go for an hour or more at high speed. We tend to forget that that little pinion is madly spinning away since the engine now loafs along in overdrive.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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