gear ratio

TacomaTRD05 · 01-12-2006, 03:06 PM

i have 05 tacoma with a 6" lift with 33" tires on twenty inch wheels. it killed my gas mileage. i am thinking about putting a bigger gear ratio on my tacoma. what is the best gear to put on my tacoma with the size tires and wheels i have? i was thinking about 4:56 gears.

TacomaNova · 01-12-2006, 03:38 PM

with the 3.4 and 33s people ususally go with 4.56s, and if they had a 2.7 4cyl they they would go 4.88s.

so assuming the 3.4 and the 4.0 are close to the same, i would guess 4.56s as well

jon_7248 · 01-12-2006, 03:57 PM

Curious, you did add in the differeance of your Speedo and Milage gauge reads now that you have the bigger tires before calculating your MPG? Just wondering cause if you had the 4.0 and 33s... I would think it would still be alright. As long as you dont race it everywhere.

nilson · 01-12-2006, 04:24 PM

What is your current gear ratio?

TacoDell · 01-12-2006, 04:28 PM

I would 'ave thought with all that 4.0 power you'd be fine with 33's... You must have a suck ass gear ratio... Yeah what is it?

trd2001 · 01-12-2006, 04:35 PM

According to Toyota's Website, you have 3.73's. Thats what my 4runner has.

nilson · 01-12-2006, 04:49 PM

You definately don't want to go with 4.56s from 3.73s with a 2-inch change in tire diameter.

stock.....31/3.73 = 8.31
current...33/3.73 = 8.85
optimal...33/4.10 = 8.05

The lower the quotient is the higher RPMs you'll turn = more power. As you can see 4.10s is going to be the way to go, RPMs will not run too much higher with the larger tires and you'll get your power back.

4.56s would have put you at a much lower number, 7.24. I can't give you any information on the specifics of how much change in RPMs you'll get from different quotients; this is just something I came up with that seems to work okay for matching up gear ratios.

jon_7248 · 01-12-2006, 05:51 PM

well if he has 373s, I would think 410s would be alright.

firebox40dash5 · 01-12-2006, 09:35 PM

I'm running 33s with 4.10s, and I've got a 2.7... power is decent, gas mileage is still about 20 on the highway, and about 17 around town. I'd think 4.56s with the 4.0L would be overkill, and would hurt his mileage, they're only 2-3" over stock...

hytenor · 01-13-2006, 12:59 AM

Quote:

Originally Posted by TacomaTRD05

i have 05 tacoma with a 6" lift with 33" tires on twenty inch wheels. it killed my gas mileage. i am thinking about putting a bigger gear ratio on my tacoma. what is the best gear to put on my tacoma with the size tires and wheels i have? i was thinking about 4:56 gears.

when you find someone who makes aftermarket gears for the '05s let everyone know

with the v6 (4x4 or prerunner) you have 3.73s. only the 2.7s got 4.10s.

TacomaTRD05 · 01-13-2006, 11:41 AM

yea i have a 3:73 gears in my truck! thank u so much for all your help! i will let u know if they make bigger gears for 05's.

hytenor · 01-13-2006, 01:21 PM

Quote:

Originally Posted by TacomaTRD05

yea i have a 3:73 gears in my truck! thank u so much for all your help! i will let u know if they make bigger gears for 05's.

at the moment no one does

TacomaTRD05 · 01-13-2006, 01:34 PM

that really sucks. let me know if u find anything out!

hytenor · 01-14-2006, 12:43 AM

Quote:

Originally Posted by TacomaTRD05

that really sucks. let me know if u find anything out!

ARB should have the lockers coming out pretty soon but so far no one makes gears....o well.

trd2001 · 01-14-2006, 08:46 AM

Quote:

Originally Posted by hytenor

ARB should have the lockers coming out pretty soon but so far no one makes gears....o well.

Speaking of ARB's did you get yours back?

hytenor · 01-14-2006, 12:34 PM

Quote:

Originally Posted by trd2001

Speaking of ARB's did you get yours back?

no

doctaco03 · 02-03-2006, 12:26 PM

I have 03 v6 auto 4wd, running 33" tires with 4:10 gears!!! Warning, this combo sucks!!! In and out of overdrive constantly on the hwy!!! Consider 4:56 or 4:88!! Leaning toward 4:88 here the more I learn from other posts!!! Good luck in your search!!

hytenor · 02-03-2006, 01:14 PM

Quote:

Originally Posted by doctaco03

I have 03 v6 auto 4wd, running 33" tires with 4:10 gears!!! Warning, this combo sucks!!! In and out of overdrive constantly on the hwy!!! Consider 4:56 or 4:88!! Leaning toward 4:88 here the more I learn from other posts!!! Good luck in your search!!

yup, that's why regearing is the best fix.

4.56s if you do only occasional wheeling and 4.88s if you wheel it a lot and don't cruse at 80 on the hwy

4.56s will get you close to stock but a little lower at an "adjusted" ratio of 4.28:1. 4.88s get you to 4.58.
this is why you should stick with 4.56s if you don't wheel much as the slightly lower ratio will compensate for the extra rolling resistance of the larger, heavier tires. 4.88s is overkill for a street truck that only sees fire roads for wheeling but are awesome on the tougher trails.

01-12-2006, 03:06 PM	#1
TacomaTRD05 Member Join Date: Jan 2006 Location: North Carolina Posts: 55	gear ratio i have 05 tacoma with a 6" lift with 33" tires on twenty inch wheels. it killed my gas mileage. i am thinking about putting a bigger gear ratio on my tacoma. what is the best gear to put on my tacoma with the size tires and wheels i have? i was thinking about 4:56 gears. __________________ 2005 Black Toyota Tacoma extended cab V6 TRD 3" suspension lift kit 3" body lift kit dynomax exhaust system k & n cold air intake 33 irocs on 20" wheels JBA Headers

01-12-2006, 03:38 PM	#2
TacomaNova Veteran Member Join Date: Dec 2004 Location: Nor Cal Posts: 741	with the 3.4 and 33s people ususally go with 4.56s, and if they had a 2.7 4cyl they they would go 4.88s. so assuming the 3.4 and the 4.0 are close to the same, i would guess 4.56s as well __________________ 2000 Xtra Cab Tacoma, with a few things on it.

01-12-2006, 03:57 PM	#3
jon_7248 Veteran Member Join Date: Feb 2005 Location: San Antonio Posts: 1,281	Curious, you did add in the differeance of your Speedo and Milage gauge reads now that you have the bigger tires before calculating your MPG? Just wondering cause if you had the 4.0 and 33s... I would think it would still be alright. As long as you dont race it everywhere. __________________ My 2 cents = 1 peso -Jon

01-12-2006, 04:24 PM	#4
nilson Veteran Member Join Date: May 2005 Location: Tuscaloosa, AL Posts: 906	What is your current gear ratio? __________________ 1996 4Runner Limited / 3.4L V6 / 4x4 / E-Locker / 204,000mi and counting 2005 Honda CRF250R

01-12-2006, 04:49 PM	#7
nilson Veteran Member Join Date: May 2005 Location: Tuscaloosa, AL Posts: 906	You definately don't want to go with 4.56s from 3.73s with a 2-inch change in tire diameter. stock.....31/3.73 = 8.31 current...33/3.73 = 8.85 optimal...33/4.10 = 8.05 The lower the quotient is the higher RPMs you'll turn = more power. As you can see 4.10s is going to be the way to go, RPMs will not run too much higher with the larger tires and you'll get your power back. 4.56s would have put you at a much lower number, 7.24. I can't give you any information on the specifics of how much change in RPMs you'll get from different quotients; this is just something I came up with that seems to work okay for matching up gear ratios. __________________ 1996 4Runner Limited / 3.4L V6 / 4x4 / E-Locker / 204,000mi and counting 2005 Honda CRF250R

01-12-2006, 04:35 PM	#6
trd2001 Senior Member Join Date: Dec 2004 Location: Socal 805 Posts: 463	According to Toyota's Website, you have 3.73's. Thats what my 4runner has.

01-12-2006, 05:51 PM	#8
jon_7248 Veteran Member Join Date: Feb 2005 Location: San Antonio Posts: 1,281	well if he has 373s, I would think 410s would be alright. __________________ My 2 cents = 1 peso -Jon

01-12-2006, 09:35 PM	#9
firebox40dash5 insert originality here Join Date: Feb 2005 Location: Coos Bay Posts: 930	I'm running 33s with 4.10s, and I've got a 2.7... power is decent, gas mileage is still about 20 on the highway, and about 17 around town. I'd think 4.56s with the 4.0L would be overkill, and would hurt his mileage, they're only 2-3" over stock... __________________ Now with 105% more bent tubing.

01-13-2006, 11:41 AM	#11
TacomaTRD05 Member Join Date: Jan 2006 Location: North Carolina Posts: 55	yea i have a 3:73 gears in my truck! thank u so much for all your help! i will let u know if they make bigger gears for 05's. __________________ 2005 Black Toyota Tacoma extended cab V6 TRD 3" suspension lift kit 3" body lift kit dynomax exhaust system k & n cold air intake 33 irocs on 20" wheels JBA Headers

01-13-2006, 01:34 PM	#13
TacomaTRD05 Member Join Date: Jan 2006 Location: North Carolina Posts: 55	that really sucks. let me know if u find anything out! __________________ 2005 Black Toyota Tacoma extended cab V6 TRD 3" suspension lift kit 3" body lift kit dynomax exhaust system k & n cold air intake 33 irocs on 20" wheels JBA Headers

02-03-2006, 12:26 PM	#17
doctaco03 Newbie Join Date: Sep 2005 Posts: 12	I have 03 v6 auto 4wd, running 33" tires with 4:10 gears!!! Warning, this combo sucks!!! In and out of overdrive constantly on the hwy!!! Consider 4:56 or 4:88!! Leaning toward 4:88 here the more I learn from other posts!!! Good luck in your search!!

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