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If you would be getting something like a TH400/3L80 backed by a GV overdrive it wouldn't be so bad, but would be more cost-effective to just get a self-contained 4-speed OD transmission (or even a 6-speed if you can deal with the controllers). Working around a secondary transmission would definitely be too much of a PITA for eventually getting a slight mileage improvement if you would manage to cross-shift properly...
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