Rear end change out
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Senior User
Joined: Nov 2007
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From: DeWitt Ne.
Rear end change out
I am looking to change out the rear end in my truck. 77 F250 2x4 with a Dana 60. The reason you may ask is desire for better fuel mileage. The 60 right now has 4.10's in it an the only towing I am worried about is my boat. Any suggestions?
Elder User
Joined: Jan 2004
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From: NW Kans
if you are concerned with fuel mileage i would go with probably a 3.54 gear if you have a 460 and maybe a 3.73 if a 351 or 400. or maybe keep the 4.10's for towing and add a Gear Vendors overdrive for mileage.
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Senior User
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From: DeWitt Ne.
Pulling a 17 foot Tri Hull, motor is a 400, tires are 245/75/16's. I havent sat down with fuel numbers other than watching my gauge. I burn very close to a quarter of a tank on a 20 mile round trip. That is at 55-60 with a bout 2 miles of that being in town. Truck is also a 4spd.
Post Fiend
Joined: Jul 2006
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thats about a 30 inch tire. You should be at about 2900 rpm at highway speeds.
should u decide that a 3.5 gear is what you want. that would be almost the same as running a 33 inch tire out back. That would be like a P275-65-16 or there abouts.
See if you can borrow some tires and try this. If you find that it helps then run with it. You can change gears, or find a rear end with the right ratio.
Dont think it will help much. These are large trucks and without a reference with actual mileage, its hard to show any type of improvement.
should u decide that a 3.5 gear is what you want. that would be almost the same as running a 33 inch tire out back. That would be like a P275-65-16 or there abouts.
See if you can borrow some tires and try this. If you find that it helps then run with it. You can change gears, or find a rear end with the right ratio.
Dont think it will help much. These are large trucks and without a reference with actual mileage, its hard to show any type of improvement.
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Joined: Nov 2007
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From: DeWitt Ne.
Thanks, I would love it if I could go good with changing out the tires. I have 285/75/16's on the front now. They were good tires that I picked up used for a very good price. I will throw those on back and see if it helps out some.
