what axle ratio?
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Freshman User
Joined: Oct 2010
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what axle ratio?
Hi Everyone,
I have a landscaping company in San Francisco and currently drive an 03 f350, 6.0., cab and chassis. I do 90 percent of my driving in the city and pull a dump trailer in excess of 16K up and down the hills of SF on a regular basis. I bought the truck new, am on my 3rd tranny and second rear end. I think its because it has 3.31 rear end and too much pressure on the drive train.
Anyways, I am buying the new 6.7 and can't decide whether to go with the f450, 4.3 gear ratio or go with the 4.8 gear ratio which would require that I get the f550.
Also, although I want the new truck now, should I wait 6 months or so for the 2012 or does it not make a difference?
Thanks all,
Paul
I have a landscaping company in San Francisco and currently drive an 03 f350, 6.0., cab and chassis. I do 90 percent of my driving in the city and pull a dump trailer in excess of 16K up and down the hills of SF on a regular basis. I bought the truck new, am on my 3rd tranny and second rear end. I think its because it has 3.31 rear end and too much pressure on the drive train.
Anyways, I am buying the new 6.7 and can't decide whether to go with the f450, 4.3 gear ratio or go with the 4.8 gear ratio which would require that I get the f550.
Also, although I want the new truck now, should I wait 6 months or so for the 2012 or does it not make a difference?
Thanks all,
Paul
Lead Driver
Joined: Jun 2007
Posts: 6,757
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From: Corvallis, OR
The 6-speed trans in the 2011 has a much lower 1st gear, so the differential doesn't have to be as low. 4.30 will be plenty low, it will seem probably two times lower than the 3.31 behind your 5-speed. 4.30s would have been a good fit for your 6.0L with that kind of usage.
Senior User
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I have a 6.0 with the 4.88's, works fine for that setup, but on my ordered 2011 6.7 I skipped the 4.88's in favor of the 4.30's. seems better as the motor makes more torque at lower rpm and it does not rev as high. I think that 4.88's would be overkill and keep it reving out of its power range.
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4.88 gear
Thanks for the imput. If using the truck to haul 16k dump trailer up and down the hills of San Francisco on a regular basis doesn't warrant the 4.88 gear ratio, what is the 4.88 made for?
Thanks
Thanks
Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
You can get the 4.88s if you want, but if you're 6.0L did it with 3.31s then the 2011 won't even break a sweat with 4.30s and the lower 1st gear in the transmission. If you get the 4.88s you'll hate it on the highway.
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