check out gear vendors,ive been thinking of putting one in a 87 i just bought.I drove for a long time a 79 ford with 460, and one of these installed from the dealer.I never had a seconds problem with it in 250,000 miles.believe it or not THAT truck got right at 20 mpg.A cheaper way might be to install an AOD transmission(not eod electric shift that requires computer control) they can be bought fairly cheaply,and with the right parts from a donor truck are a bolt on.lots of info on ford truck forums.before you spend a lot of money though,consider how you drive the truck and what advantage you would gain by swapping rearend gears.on mine by swapping to 3.08 gears(from 3.55) ,and changing from the stock @26" tires to a taller 30" i can gain 15%.drop 65 mph engine rpms from @3000,to @2500(calculated) which should make a better hyway effecient vehicle.with that and a aod rpms would be close to 1500,which would be so low on my engines(351) torque curve that it would likely be worthless.do a search on web for gear ratio calculators,and you can plug and play with different setups.keep in mind you dont want to get to far below your engines peak torque,3-500 rpms below peak torque is a good aiming point.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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