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Old 09-14-2017, 03:06 PM #16
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Good time to snag an e-locker rear diff too for a retro-fit.

If you're gonna go through the trouble for a 2wd, might as well give it a little bit of off-road capability while you're at it. Could be fun on a beach and/or packed trails.
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Old 09-14-2017, 03:43 PM #17
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Originally Posted by SpidermanGeek View Post
Good time to snag an e-locker rear diff too for a retro-fit.

If you're gonna go through the trouble for a 2wd, might as well give it a little bit of off-road capability while you're at it. Could be fun on a beach and/or packed trails.
Even better with 2WD - no front diff to match! (and a 4:30 or 4:10 will both work great)

-Charlie
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Old 09-14-2017, 03:45 PM #18
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Quote:
Originally Posted by JDM_4Runner View Post
Ok, so does anyone know the axle code for the 3.90 gear? If I go hunting at the salvage yards I'll need to know so I can hopefully specify the correct axle. It seems like I can find everything except the 3.90 code when searching.

Or, should I just purchase a new 3.90 gear set and have my rear end serviced with new seals and bearings? Can anyone recommend a good/trusted brand for the gear set?

Thanks!
Eric
I would not waste time on the 3.91's - get at least the 4.10's or 4.30's. And get a speedometer calibrator to compensate for the different gears/tires.

Just a fyi, the typical codes for the 96-02 4Runners are as follows:
A01A 3.73
A02A 3.91
A03A 4.10
A04A 4.30
A05A 4.56

This is not a guarantee as there are some that have been swapped and some that are just anomalies.
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Old 09-15-2017, 12:32 AM #19
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Thanks Fellas! OK, so I'm sold on the 4:10 gear. I found this chart on off-road.com, which helps confirm your suggestions.

Toyota Gear Ration and Tire chart: Off-Road.com

It seems to illustrate pretty easily roughly where you should be in terms of gear ratio per tire size. This site also helps covering tire sizes...https://tiresize.com/calculator/

I was thinking of upgrading my diff to an Eaton 913A610. Does anyone have any feedback on this unit?

https://www.summitracing.com/parts/dtl-913a610
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Old 09-15-2017, 12:51 PM #20
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As others have said, 4.30 only came on 4wd, Limiteds with e-locker.
Hmm. My 96 lists as 4.30's on the sticker, it is an SR5 w/o e-locker. Need to do the spin test.
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Old 09-15-2017, 02:28 PM #21
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Quote:
Originally Posted by JDM_4Runner View Post
It seems to illustrate pretty easily roughly where you should be in terms of gear ratio per tire size. This site also helps covering tire sizes...https://tiresize.com/calculator/

I was thinking of upgrading my diff to an Eaton 913A610. Does anyone have any feedback on this unit?

https://www.summitracing.com/parts/dtl-913a610
Just don't pay much for a 4:10... they should be all over for nearly free!

As for the LSD - Torsen-type LSDs are great for street driving. Always working, completely smooth and seamless operation. If you are ever going to be in a position that lifts a rear tire off the ground, it won't do anything - so not great for off-roading.

My personal plan for my 4Runner involves front and rear Truetracs, along with some other stuff...

-Charlie
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Old 09-16-2017, 01:48 PM #22
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Thanks Phattyduck!

I'm going to start hunting for a set of 4.10 gears.

So perhaps a locker would be better for me since I'm 2WD and I do occasionally like going on trails. However, I also like to visit my friend in Reno Nevada and have driven through snow, I wonder what the temperament of the locker will be. I guess the traction control will keep things in check.

Here's the Eaton locker...
https://www.drivetrainshop.com/Detro...t-187sl61b.htm

Any thoughts guys?
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Old 09-16-2017, 04:35 PM #23
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If the car doesn't feel *too* slow, I wouldn't bother with the regear. The difference in your speedo is probably not that great. If you want to calculate the difference, it's super easy:

1) Divide the new tire & wheel diameter by the old. This is calculated with the following formula:

(Wheel diameter) + (Tire width x Aspect Ratio x 2) = Tire % wheel diameter

Note that you need to convert the wheel diameter from inches to mm.

2) Multiply the fraction you calculated in step 1 by what the speed is reading. This will give you the correct vehicle speed.
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Old 09-16-2017, 04:59 PM #24
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A2toHgt, thanks for the info. It definitely doesn't feel too slow but I need to regain a little more power back since I'll be towing my track car on a trailer.
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Old 09-29-2017, 01:19 AM #25
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Quote:
Originally Posted by JDM_4Runner View Post
A2toHgt, thanks for the info. It definitely doesn't feel too slow but I need to regain a little more power back since I'll be towing my track car on a trailer.
Total towed weight (trailer plus track car) shouldn't exceed 3000-3500# to be safe with a 5000# vehicle, and I would want trailer brakes more than an eLocker for that task.

EDIT, I just noticed a post of yours saying you drive to Reno, my gf lives there. How Ironic. I've done both 395 and I-80 with snow in my 2WD, it did fine with ECT mode and no chains. I have a 4.1 rear and 16" wheels.
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Old 09-29-2017, 01:39 AM #26
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Quote:
Originally Posted by octanejunkie View Post
Total towed weight (trailer plus track car) shouldn't exceed 3000-3500# to be safe with a 5000# vehicle, and I would want trailer brakes more than an eLocker for that task.

EDIT, I just noticed a post of yours saying you drive to Reno, my gf lives there. How Ironic. I've done both 395 and I-80 with snow in my 2WD, it did fine with ECT mode and no chains. I have a 4.1 rear and 16" wheels.
Yeah I'm hoping to score a lightweight aluminum trailer at just over 1,000 lbs. and my track car weighs 2,250 lbs., so I definitely expect to be in a good range.

I drove my 4Runner back down the 395 a day after heavy snowfall and had to drive on ice packed road. I was really impressed how well the traction control/stability assist kept my truck in check and safe with no chains.

I would like to add a little more overall capability to my 4Runner, just not sure if a locker or LSD satisfies 1. Towing 2. Occasional Snow 3. Occasional Off Road
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Old 09-29-2017, 01:46 AM #27
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I won't difinitively take a position here but I'm a fan of LSD for all around use, wheeling specifically an eLocker seems to be the hot ticket (read 99 Limited) but I can't comment on towing from experience.
I can say that if you have 16" wheels and are gonna tow 3K to Reno and back you might want the bigger Tundra Brakes. I'm sticking with stock brakes, personally.

What color is your rig? We may have passed each other on 395 - I always notice other 3rd Gens.

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Old 09-29-2017, 01:55 AM #28
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Quote:
Originally Posted by octanejunkie View Post
I won't difinitively take a position here but I'm a fan of LSD for all around use, wheeling specifically an eLocker seems to be the hot ticket (read 99 Limited) but I can't comment on towing from experience.
I can say that if you have 16" wheels and are gonna tow 3K to Reno and back you might want the bigger Tundra Brakes. I'm sticking with stock brakes, personally.

What color is your rig? We may have passed each other on 395 - I always notice other 3rd Gens.

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Thanks, kind of what I was thinking. And yup, I did the Tundra brake upgrade about 2 months ago and I'm loving it! I'll need to post up everything about my 4Runner soon, once I find a good way to share images since photobucket screwed us haha.

I've only made it up to Reno once, earlier this year to visit my buddy and his fam. I'm hoping to go back up in November to visit again. I wouldn't be towing the car up there, mainly Buttonwillow and Willow Springs.
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Old 05-12-2021, 01:29 AM #29
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Hey Guys! Haha long time no update! I suck sorry, just don't have as much time as I used to. So here's where I'm at. I bought a whole rear end for $100 bucks from member 1904runner out of San Diego who said he upgraded his rear end to an E-Locker. "I have a 4.10 rear axle that was recently taken out of my 3rd gen. Worked perfectly fine before I replaced with a a locker axle. Located in SD"

I finally got around to swapping out my original 3rd member a week ago for the one that's supposed to be a 4.10. Guess what...when I hit highway speed I get the same damn exact result as I did with my original 3rd member! Yup, that's 70 at the cluster around 2,400 RPM, while GPS is saying I'm doing 75. WTF???

I tested the same GPS on my bone stock 02' Civic, 70 at the cluster and 70 on the GPS.

So, did I get gypped by 1904runner? Or is there some other explanation?
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Old 05-12-2021, 01:43 AM #30
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Quote:
Originally Posted by JDM_4Runner View Post
Hey Guys! Haha long time no update! I suck sorry, just don't have as much time as I used to. So here's where I'm at. I bought a whole rear end for $100 bucks from member 1904runner out of San Diego who said he upgraded his rear end to an E-Locker. "I have a 4.10 rear axle that was recently taken out of my 3rd gen. Worked perfectly fine before I replaced with a a locker axle. Located in SD"

I finally got around to swapping out my original 3rd member a week ago for the one that's supposed to be a 4.10. Guess what...when I hit highway speed I get the same damn exact result as I did with my original 3rd member! Yup, that's 70 at the cluster around 2,400 RPM, while GPS is saying I'm doing 75. WTF???

I tested the same GPS on my bone stock 02' Civic, 70 at the cluster and 70 on the GPS.

So, did I get gypped by 1904runner? Or is there some other explanation?
It seems you may have missed the post below from 2017 letting you know why re-gearing wouldn't fix your speedometer.

Quote:
Originally Posted by phattyduck View Post
All 4Runner door stickers list 15" tires... so that's no clue.

V6 auto 15" wheel trucks will have 3.73 gears. That's what my '99 had.

Changing gear ratios will not change the speedo on any 4Runner with ABS (which all 2001/2002's had). The speedo is driven by the ABS system from wheel speed sensors. You will need to put a speedo calibrator on the signal from the ABS box in the passenger footwell that goes up to the gauge cluster. Imgur is having an issue, otherwise I'd show you a pic of one in my truck...

You will be happy with 4:10 gears, which will get you very close back to how your truck was stock. You should be able to get the stock diff from many 4WD 4Runners that have been upgraded.

-Charlie
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