duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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The two common are 3.73:1 and 4.10:
3.73:1 is 3.73 revolutions of the driveshaft to 1 turn of the ring gear.
4.10:1 is 4.10 revolutions of the driveshaft to 1 turn of the ring gear.
There are limited slip differentials, open differentials and locked differentials.
These are the common rear axles for the super duties from 99-03. After that I am not sure what was offered because I own an 02.
Now depending on tire size, driving conditions and all that. The lower the gear ratio the better fuel mileage you will get.
The higher gear ratio the quicker acceleration you get but lower fuel mileage.
As for fuel economy you want a lower gear ratio. This will keep your rpm's down, for top speed well they will all have the same top speed just depends on how quick you want to reach it.
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2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt