Gears
Senior Member
Joined: Sep 2009
Posts: 422
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From: Medford Oregon
if i was too do a 4.10 gear what would my gas mileage be at? i have the 4.6 with a five speed, i dont want to have my rpms through the roof because i drive to school and back on the interstate every day and i do well over 60 haha. i doubt id go with 4.88s or even 4.56s cause im not wheeling the thing ya know. so im looking at like $600 for the gears and what not? i will due all the labor myself
Senior Member
Joined: Mar 2012
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Originally Posted by austin1
if i was too do a 4.10 gear what would my gas mileage be at? i have the 4.6 with a five speed, i dont want to have my rpms through the roof because i drive to school and back on the interstate every day and i do well over 60 haha. i doubt id go with 4.88s or even 4.56s cause im not wheeling the thing ya know. so im looking at like $600 for the gears and what not? i will due all the labor myself
I Like Tires
Joined: Aug 2010
Posts: 4,828
Likes: 250
From: Texas
Originally Posted by austin1
if i was too do a 4.10 gear what would my gas mileage be at? i have the 4.6 with a five speed, i dont want to have my rpms through the roof because i drive to school and back on the interstate every day and i do well over 60 haha. i doubt id go with 4.88s or even 4.56s cause im not wheeling the thing ya know. so im looking at like $600 for the gears and what not? i will due all the labor myself
It will actually put your around the same gear ratio as if you had 3.73 with stock tires so no noticeable difference on mpg or significant rpm change and better for your trans.
Last edited by BassAckwards; May 5, 2012 at 07:33 PM.
All 97-03 automatic's (besides the 7700) have the 4R70W tranny with the same 4 gear ratios;(regardless of engine) The only difference is the 5.4 with a 1.9 torque conv. and the 4.6 with the 2.3!
1-2.84
2-1.55
3-1.00
4-.7
I could run some numbers comparing the two (using a math program called mat-lab), but I can already tell you its going to be *TERRIBLE* at pulling, acceleration, fuel efficiency, and reliability(parts wearing out).
Senior Member
Joined: May 2012
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I had a 98 f150 with 3.55LSD, with 35 BFG MT's and I didn't notice the huge drop in power till I regeared it to 4.56 with an Auburn LSD. Theres an equation that tells you what ratio would bring it back to the stock get-up and if going from a 31' stock tire to a 35', the closest ratio would be 4.56. I could eat most trucks and cars up off of the line. The difference was night and day and would run 70mph on the freeway all day at around 2000rpm. I still have the full rear end and am selling it for cheap. PM me if interested. I'm in SoCal.
Senior Member
Joined: May 2012
Posts: 1,035
Likes: 78
Originally Posted by CaSCrew11
I had a 98 f150 with 3.55LSD, with 35 BFG MT's and I didn't notice the huge drop in power till I regeared it to 4.56 with an Auburn LSD. Theres an equation that tells you what ratio would bring it back to the stock get-up and if going from a 31' stock tire to a 35', the closest ratio would be 4.56. I could eat most trucks and cars up off of the line. The difference was night and day and would run 70mph on the freeway all day at around 2000rpm. I still have the full rear end and am selling it for cheap. PM me if interested. I'm in SoCal.
