01-08-2021, 11:09 AM
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#1
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running 285s, what gear ratio should I get for better mpg and speedo correction?
I made a post somewhere else, facebook or maybe reddit. whichever, I cant find the post now. I have a 3 inch lift, running 285s now and the speedo is off and the mpg is down a few numbers. What gear ratio do I need to look for when searching for a locker rear end?
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98 SR5 4wd, CS144, compass/temp mirror, 2nd gen Hilux Altimeter/Inclinometer ,Chinese knock off diesel heater, Chinese copy of Alpicool CX50, OME 3" lift, 1" Toytec body lift, Snorkel, 13WE, Borla catback, Android hu, LED H4
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01-08-2021, 12:08 PM
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#2
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This has been discussed profusely on this forum. Here is. good one.
Axle Gear Ratio's
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01-08-2021, 12:38 PM
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#3
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Quote:
Originally Posted by CWccw
I made a post somewhere else, facebook or maybe reddit. whichever, I cant find the post now. I have a 3 inch lift, running 285s now and the speedo is off and the mpg is down a few numbers. What gear ratio do I need to look for when searching for a locker rear end?
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What's your gears now? How much is it off at 75mph? Is it an auto or 5 speed? MPG's will not change significantly.
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01-08-2021, 12:56 PM
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#4
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Quote:
Originally Posted by CWccw
I made a post somewhere else, facebook or maybe reddit. whichever, I cant find the post now. I have a 3 inch lift, running 285s now and the speedo is off and the mpg is down a few numbers. What gear ratio do I need to look for when searching for a locker rear end?
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If you have ABS, then regearing will not affect your speedometer. ABS equipped vehicles use the wheel speed sensors for speedometer input. Non abs vehicles use a speed sensor on the transfer case.
Most people with 285's that are automatic regear to 4.88 to account for increased wheel size, wheel weight, and any additional weight from armor and accessories on the vehicle.
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2000 SR5 V6 Manual 4WD https://www.toyota-4runner.org/3rd-g...biography.html
2000 Limited V6 Auto E-Locker Sold 3/2022
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01-08-2021, 01:12 PM
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#5
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Since you have an SR5, you have ABS - and as the other poster said, gearing will not affect your speedo. You will need to get a speedometer calibrator to adjust the speed signal sent to your gauge cluster then ECU from the ABS computer.
I used the SGI-5 from Dakota Digital, install shown below (on my '99 - your wire colors may be different):
-Charlie
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01-08-2021, 02:28 PM
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#6
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Gear Ratio Calculator. good info put in your numbers, Auto - trans OD is off for 1:1 ratio.
285/75-16 10 ply 4.56 gears Auto my RPM's are 3150 I like it for how I use it, lower RPM's.
4Runner OE Lockers came with 4.30 ratio.
Last edited by 96RedRunner; 01-08-2021 at 02:31 PM.
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01-08-2021, 03:45 PM
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#7
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FWIW, I run 285/75/16 with stock 4.10 gears. Comparing GPS speed and tracking it appears I'm off by ~7%.
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01-08-2021, 05:54 PM
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#8
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Wasn't any concern on speedo for me, just kept in mind driving around.
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01-08-2021, 07:21 PM
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#9
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when im doing about 68-69 gps shows 71. Im not sure what my stock gear ratio is.
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98 SR5 4wd, CS144, compass/temp mirror, 2nd gen Hilux Altimeter/Inclinometer ,Chinese knock off diesel heater, Chinese copy of Alpicool CX50, OME 3" lift, 1" Toytec body lift, Snorkel, 13WE, Borla catback, Android hu, LED H4
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01-08-2021, 08:57 PM
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#10
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Quote:
Originally Posted by CWccw
when im doing about 68-69 gps shows 71. Im not sure what my stock gear ratio is.
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Says so on B-pillar label AO3A = 4.10 AO4A = 4.30
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01-09-2021, 01:17 PM
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#11
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Quote:
Originally Posted by Bad Luck
Most people with 285's that are automatic regear to 4.88...
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Thought long n hard on this 4.88 seems to be trail street gears, 4.56 street trail with 285's.
4.56's feel like stock performance on 285's with good mpg's, offroad, I'm dual locked so power gain from 4.88's
wasn't worth running higher rpm's where I spend most of my time. No plans for bigger than 285's.
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01-09-2021, 01:48 PM
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#12
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Quote:
Originally Posted by 96RedRunner
Says so on B-pillar label AO3A = 4.10 AO4A = 4.30
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I have AO3A/A340F
If I go to 4.56s would my mpg increase? I used to get 280+ to a tank now im luck if i get 225.
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98 SR5 4wd, CS144, compass/temp mirror, 2nd gen Hilux Altimeter/Inclinometer ,Chinese knock off diesel heater, Chinese copy of Alpicool CX50, OME 3" lift, 1" Toytec body lift, Snorkel, 13WE, Borla catback, Android hu, LED H4
Last edited by CWccw; 01-09-2021 at 02:04 PM.
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01-09-2021, 03:56 PM
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#13
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You'll get some mpg's back all I can say.
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