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Overdrive is a "creature comfort' 1980

posted by  someone claiming to be John McPhail on  Wed Jan 23 21:17 CST 2013 [RELATED]

Overdrive cuts down significantly on engine noise, but it does not improve gas mileage much (1 or 2 mpg at most in my experience) and the engine doesn't care whether it is turning 2,500 in overdrive or 3,000+ in 4th gear.

With a 3.91 rear end, you will probably spin 3,200-3,300 at 65 mph and 3,500 at 70 mph. Noisy but not a big deal.






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