Rear end ratio options
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Junior User
Joined: Jul 2007
Posts: 61
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From: Surprise, Az
Rear end ratio options
So I was building my own cyberspace truck and noticed that the highest rear end ratio I could go with a dually was 3.73. The other options I saw were a 3.31 and a 3.55. Is this true? Is this the solution to increase mpg? A diesel truck with a 3.31 or 3.55, seriously? What about those of us that want to tow something? They also upped the 5th wheel tow capacity with the 3.73. How can they let you tow more when nothing changed? Even the 450 is stuck with a 3.73. Please tell me I'm wrong.
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Junior User
Joined: Jul 2007
Posts: 61
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From: Surprise, Az
Well after doing some more digging it seems there is contradictory info on their web site. When I build a 450 it shows the 4.30 as an option but under the towing section it isnt an option for the 450 with the diesel.
Senior User
Joined: Feb 2007
Posts: 233
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From: Black Hills, South Dakota
Take a look at the gear ratios in the transmission before you make any final verdict. I don't know what they are, but having 6 gears to play with can give you more of a spread than you might think.
Freshman User
Joined: Jan 2008
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I believe the new 6spd has a 3.97 first, which would make overall gearing lower than previous years.
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Lead Driver
Joined: Jan 2010
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That is correct according to the December spec sheet.
4.30 limited slip standard for F-450
4.30 limited slip standard for F-450
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Junior User
Joined: Dec 2006
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From: Thousand Oaks
When I ordered my truck I was told I only had the option of 3.31 gears due to one of my options I picked (not sure which), I could pick either Electronic locking or Non Limited slip. I took the Electronic Locking option and I hope I am not going to be disappointed with the 3.31 gears on my new truck.
Elder User
Joined: Feb 2008
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Based on this calculator Potential Engine Speed (RPM) Calculator
The new diesel would redline in 1st at 22mph with the 4.3 diff (4000rpm)
29mph with the 3.31 diff. I would go for the 3.31 E-locker.
(based on Tire diameter 32.1")
The new diesel would redline in 1st at 22mph with the 4.3 diff (4000rpm)
29mph with the 3.31 diff. I would go for the 3.31 E-locker.
(based on Tire diameter 32.1")
Lead Driver
Joined: Jan 2010
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With the 6.7L, 3.55 e-locking is only available on the F-250 if you get the 4x4 option and one of these: heavy service front suspension, heavy service for pickup box delete, snow plow prep or camper package.
I got the 3.31 e-locking on my truck.
I am still a little apprehensive about it but we'll see.
Like senix said, they can be swapped later except a little more costly with a 4x4.
I got the 3.31 e-locking on my truck.
I am still a little apprehensive about it but we'll see.
Like senix said, they can be swapped later except a little more costly with a 4x4.
(admittedly driven like a grandma)