Question about gears
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Elder User
Joined: Apr 2004
Posts: 552
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From: Midland, TX
Question about gears
Here pretty quick I'm gonna need a set of tires and I'm planning on going with some Toyo M/T's in 35x12.50 20R on my stock 20"s.
I currently have and hate 3.73's and I'm thinking of goin 4.10's but I wonder if 4.56's would be better for me. I do a lot of highway driving so the 4.56's would hurt a little but I pull my hunting wagon around fairly often and it with the trailer totals out to 12-14K.
Would the 4.56's be over kill with 35"s on stockers or would 4.10's suit me better?
As long as my mileage stays around 15ish I'll be happy but I like the grunt of the lower gears.
What do you guys think and if you have experience with 35"s and 4.10's or 4.56's let me know.
I currently have and hate 3.73's and I'm thinking of goin 4.10's but I wonder if 4.56's would be better for me. I do a lot of highway driving so the 4.56's would hurt a little but I pull my hunting wagon around fairly often and it with the trailer totals out to 12-14K.
Would the 4.56's be over kill with 35"s on stockers or would 4.10's suit me better?
As long as my mileage stays around 15ish I'll be happy but I like the grunt of the lower gears.
What do you guys think and if you have experience with 35"s and 4.10's or 4.56's let me know.
Posting Guru
Joined: Jul 2005
Posts: 1,617
Likes: 4
From: Denver, Co
Tow a lot at the 12-14K range = 4.56s to be happy with the towing & live with whatever impact there is on unloaded driving
50%/50% mix of medium/heavy towing & unloaded driving = 4.30s to find that "balance"
Mostly unloaded driving with some medium/heavy towing = 4.10s to be happy with unloaded driving & live with towing performance/mileage
Tough call...I'm sure some folks that have done gear changes will chime in at some point!
50%/50% mix of medium/heavy towing & unloaded driving = 4.30s to find that "balance"
Mostly unloaded driving with some medium/heavy towing = 4.10s to be happy with unloaded driving & live with towing performance/mileage
Tough call...I'm sure some folks that have done gear changes will chime in at some point!
New User
Joined: Jan 2008
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Tagging along on this thread!!!
I have an 06 F-250 SD 6" lift running 37MT's on 18"wheels should i swap out stock 3.73's or leave alone. I would like a little better fuel mileage but do not tow anything with truck. If sow what?
Thanks in advance
Wil
I have an 06 F-250 SD 6" lift running 37MT's on 18"wheels should i swap out stock 3.73's or leave alone. I would like a little better fuel mileage but do not tow anything with truck. If sow what?
Thanks in advance
Wil
Last edited by Wilstruck; Jan 9, 2008 at 02:29 PM.
Reads ***** rules!
Joined: Nov 2007
Posts: 1,105
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From: So.Ca./ N.E. UT
37's with 3.73 are said to be really hard on tranny, even if you don't tow. 4.10 would be closer to the stock set (3.73) with 37's, but then again what is your stock tire size? Check the drivers door sticker! For my truck the mfr's tire size is 34.1 (on 20's) and a stock gear of 3.73, either the 4.10 or the 4.30 will get me back in the range of the stock setup with 37's.
The effective gear ratio going from a 34.1 diameter to a 37 diameter with 3.73 is 3.44:1. To get me back to stock I would need a 4.05:1 gear ratio with 37's. I can choose either 4.10 or 4.30, 4.30 or above if towing, 4.10 can tow as well but 4.30 & up will give better tow performance while 4.10 will give better economy.
The effective gear ratio going from a 34.1 diameter to a 37 diameter with 3.73 is 3.44:1. To get me back to stock I would need a 4.05:1 gear ratio with 37's. I can choose either 4.10 or 4.30, 4.30 or above if towing, 4.10 can tow as well but 4.30 & up will give better tow performance while 4.10 will give better economy.
