which gear ratio??
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Freshman User
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which gear ratio??
Hey guys I wanna get your thoughts. I just picked up a 2002 f-250 w a 5.4 v8. I just bought a 6" lift and 37" tires for it. Im not too sure on which ring and pinion gear ratio to go with. I dont haul too many heavy loads and will only be doin some light wheeling, this will also be my daily driver. I was lookin at 4.56's or 4.27's or would that be too low???
Also having trouble identifying the front axle, i found the rear was a ford 10.5". now not sure if the front is a dana 50 or 60????
THANKS
Also having trouble identifying the front axle, i found the rear was a ford 10.5". now not sure if the front is a dana 50 or 60????
THANKS
Senior User
Joined: Mar 2009
Posts: 392
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From: Middletown NJ
I believe the front is a Dana 50 axle, and what Gear Ratio do you currently have? How important is fuel economy to you? If it is really important, 4.10 could work, if you want a little of both worlds, 4.56 should be fine, and if you really want some acceleration, the 4.88 would be what you want.
If I were you I would go with 4.27s, because it will give decent fuel economy while still having a little kick to it.
If I were you I would go with 4.27s, because it will give decent fuel economy while still having a little kick to it.
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Joined: Sep 2000
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From: Stephensville WI
OK, assuming you started with a 3.73 ratio and the stock tires were 31.5 inches, you need to now install a 4.3812698412698 gear ratio to get back to the stock effective ratio. A 4.10 still won't offer the leverage you had with the smaller tires and stock gears.
A 4.30 ratio is very close, but you may want more depending on how your truck drove before the lift. A lifted truck and wider tires offer more wind and rolling resistance, so you may want to also jump a little with the gearing, to a 4.56 ratio.
A 4.30 ratio is very close, but you may want more depending on how your truck drove before the lift. A lifted truck and wider tires offer more wind and rolling resistance, so you may want to also jump a little with the gearing, to a 4.56 ratio.
Last edited by redford; Apr 29, 2010 at 12:55 AM. Reason: Fixed typo
Lead Driver
Joined: Jun 2007
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From: Corvallis, OR
What does the front being a D60 have to do with your gear choice? To me, the 5.4L should have 4.10s minimum stock, 4.30s if towing, so when you step up to 37" tires you need to increase that ratio by the same percentage as the tire size increase, which is about 15%. 15% more than 4.10s is 4.77, so I would go with 4.88s since you have a lot more rolling mass with the larger tires.
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in my first post i asked about my front axle wasent sure what it was. how close would this chart get me even though its using a manual tranny??Lift Kits, Tires & Wheels by 4 Wheel Parts
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Joined: Nov 2004
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From: So Oregon
Maybe I'm jumping in late, but stock V10 trucks come with 4.10 or 4.30 gearing and 265/70/17 tires (31.6" tall). So, you're going up 6+ inches in tire size, likely wider and it's not just the height/width to consider, but the weight of the new tires has an impact. Were it me I'd be looking at it kind of like 15 - 20% taller than stock and then figure I'd want about 20% better gearing, so I'd be looking at least 4.88. The reason I used the V10 as an example is because that's what I have and because the V10 has more power than the 5.4L V8. With the smaller engine you're going to have less "ooomph" on tap in the first place, so lower gears will be better...unless you're usually just cruising down the highway without a trailer, or if you're not going down many trails with mud and such.
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