wldrbob
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.79 od x 4.9 x 2000 x 43 in tires= 66 mph... .79 od x 6.72 x 2000 x 43 in tires=48 mph standard trans no od 1x4.9 x 2000 x 43 in tires is 52 mph so if you have a trans with no od its almost equal to a trans with od 4 mph faster i dont know how much putting in od costs bet its not 3600 though ..oh your top speed with od is .79od x 6.72 x 2600 x46 in tires = 67 mph and your truck with 4.9s .79 x 4.9 x 2600 x 46 =92 mph
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