gear ratios
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
Originally Posted by GregsSD
Need to know what truck you have,gas or diesel, 4x2 or 4x4, stock or lifted, what size tires you have.
It all makes a difference!
It all makes a difference!
Got to give us more...sounds like you might be looking at a '08 SuperDuty with the new option of 3.55 gears and PSD 6.4L...right?
biz
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Well based on that info...IMO...go with the 3.73 gears. The towing...and mainly the lift (larger tires) are the reason here. However, if you were going to keep the SD all OEM stock...then the 3.55 would be the way to go.
biz
biz
Hotshot
Joined: Aug 2006
Posts: 17,400
Likes: 319
From: Whittier, CA
For Job 3 '08s with the 6.4L the 3:55 gears are now standard. They are trying to help us with the fuel mileage which has been a major complaint with the new motor.
They did not lower the tow ratings. So apparently Ford thinks the motor still has plenty of torque up to it's rated tow capacity. Considering the 6.0 had 70 ft/lbs less torque and was/is a very capable tow vehicle, I would say they are right.
So, unless I was towing a large trailer at near the maximum weight rating, I think I would go with the 3:55's. What you propose to tow is childs play for that truck, so stick with the 3:55's and enjoy a little better fuel economy. You will have plenty of power.
Bill
They did not lower the tow ratings. So apparently Ford thinks the motor still has plenty of torque up to it's rated tow capacity. Considering the 6.0 had 70 ft/lbs less torque and was/is a very capable tow vehicle, I would say they are right.
So, unless I was towing a large trailer at near the maximum weight rating, I think I would go with the 3:55's. What you propose to tow is childs play for that truck, so stick with the 3:55's and enjoy a little better fuel economy. You will have plenty of power.
Bill
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