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Re: Higher gear for differential
Do you have leaf or coil springs? This determines the selection of rears you can use, unless you want to weld on the required mounting brackets.
I believe an overdrive transmission with a lockup converter would help your city mileage if you wire it to lock in 2nd and 3rd (don't worry, this was the stock setup on a lot of factory installations). This would not be true for an external O/D like the Gear Vendors or US Gear, because then you would still be driving through your original converter. Also, a version of the TH350 is available with a lockup converter. By itself, it should help your city mileage, but you would still need a rear end swap to address your highway issues.
Ray
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