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Differentials and top speed?

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Old Jul 15, 2014 | 12:27 AM
  #1  
teag's Avatar
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From: No. Kentucky
Default Differentials and top speed?

New to the Forum just registered last night. Been reading a lot of the posts. I'm a long time Ford owner but this is my first real 4X4 I've owned. It's a 1995 F150, 302, 5 speed (O/D) Mazda tranny. It has a 8" suspension lift and a 4" body lift and the tires are 35/12.5/15's. The door label says it's a 19 axle. I did the test marking the tire and the drive shaft and the ratio looks about 1 tire rotation to 3 drive shaft rotations. My top speed is about 55 to 60 MPH. I have another daily driver but I'd like to get to the woods a little faster.
Thanks Teag

Last edited by teag; Jul 15, 2014 at 09:03 PM.
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Old Jul 15, 2014 | 12:36 AM
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frame lift? you mean suspension lift i presume.

12" of lift and only 35"??

Im not sure by the axle code what gears you have, but by your description you likely have 3.08. I would go for 4.56.
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Old Jul 15, 2014 | 12:44 AM
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Sorry about that yes it's suspension lift. I picked it up with the lifts already installed and I had access to a new set of TA's. Plenty of room for bigger tires but not in my budget. It sits at about 34 inches at the bottom of the door
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Old Jul 15, 2014 | 06:30 PM
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If you mean 19 under axle code its a 3.55 open, 3.08 is code 18.
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