Archive Mega-Thread: X-Runner: Differential

Well, here my intro post and a question. I just got my X last week (Tuesday to be exact, it is Black and I have no pics yet http://www.CustomTacos.com/ubbthreads/images/graemlins/frown.gif ) and was thinking about getting the electronic shifting diff that is available for the pre-runners and 4x4's put in the X. Why isn't this an option on the X I'm wondering? A locker gives better traction at the strip and thats really what I want it for and when it is off it is still Limited slip for the twistys. Is this a bad thing to want, any disadvantages?

Welcome to the site and congrats on the X.
I don't think you can have both e-locker and LSD. You should be fine with the LSD that comes stock on the X.

The locking differential is only supposed to be used under 5mph, right. In case you get stuck. LSD keeps it from having only one wheel spinning.

An e-locker is _not_ 'limited slip' when it's disengaged - it's open. If you want strip + curvy road performance, you want the LSD, not a locker.

ok, thanks. I was hoping it was like the aftermarket diffs they make for Mustangs. Auburn gear makes one for the 8.8's that is an LSD and at the flip of a switch it becomes a locker. Oh well, one can dream. http://www.CustomTacos.com/ubbthreads/images/graemlins/grin.gif
The LSD is fine by me. A review I read confused me on that I guess. I do want the supercharger if and when it ever comes out and I hope somebody finds a way to make the scoop functional. I waited 8 months for this truck to hit a lot and now I'll just have to wait for the mods to start coming out for it. http://www.CustomTacos.com/ubbthreads/images/graemlins/grin.gif

just wanting to know if both tires spin at the same time, to where if you were to do a burn out you would leave TWO lines

A limited slip differential ('posi') is more likely to allow you leave 2 burnout marks, but not as likely as if you used a locker...

just wanting to know if both tires spin at the same time, to where if you were to do a burn out you would leave TWO lines



Yeah the LSD, makes both tires spin at the same time, two lines left after the burnout.

Yeah, mine hooks both up real nice. The other cool thing about the new elctronic lsd, is that it transfers the power accordingly to the wheel with the most weight being forced upon it. Supposedly it is designed for when powering out of corners and such.

That sound neat. Who makes one and how does that work?

Gadget

www.GadgetOnline.com (http://www.GadgetOnline.com)

Well, I guess Toyota is the one making it. It came in the new tacos stock. I was in the dealership having that damn rattle checked out last week, and they left me in their service depts. employee break room. Luckily, they happend to leave all their tech books and manuals on the new 05's on the table, so reading i went for a couple hours! Alot of interesting info on the motor design, vvt-i, and such.

Good. So where is the oil cooler on the XRunner?

Gadget

www.GadgetOnline.com (http://www.GadgetOnline.com)

well my 03 dub cab has rear diff lock but you have to push a button to engage it and if you dont and you keep it normal only one spins

ok I know I asked this before but no one could give an answer. I was wondering if anyone else has found out yet.
I really wanna get some 3.56 for my X just dont know what size the ass is on them. Is it same as the 4x4 or 2wd

i second that.............i need some gears too.

As far as I know it is the same 8.4" diff from the previous year Tacos. The axle housing is different.

Gadget

As far as I know it is the same 8.4" diff from the previous year Tacos. The axle housing is different.

Gadget



correct, it's exactly the same as the S-runner, but wider and with LSD already installed.

So if I look for gears for a non trd rear end from previous generations do you think they will fit up just fine

So if I look for gears for a non trd rear end from previous generations do you think they will fit up just fine



Strictly speaking.... Not quite as you stated it...

The later 8" (aka '8.4') differential is found in: Tundra, Sequoia, T100, Tacoma 4X2 V6 (including S-Runner), and PreRunners / 4X4's without the electric locking differential unit.*

* Because the electric locker was available as a separate option (e.g., in '04 on XC and DC 4X4's and PreRunners) you can't simply assume "non-TRD = good to go."

You have any good places i could maybe look at that might sell gearing for the XRunner. If its the same diff size as the SRunner like others have said.
I really like to get a set of gears in there as my next modification

I dont recommend buying the set from toyota.
I called them to see what a set of the 3.73 out of the v6 4.0 and they want 800bucks for just the ring and pinion..thats just INSANE

So if I look for gears for a non trd rear end from previous generations do you think they will fit up just fine



Strictly speaking.... Not quite as you stated it...

The later 8" (aka '8.4') differential is found in: Tundra, Sequoia, T100, Tacoma 4X2 V6 (including S-Runner), and PreRunners / 4X4's without the electric locking differential unit.*

* Because the electric locker was available as a separate option (e.g., in '04 on XC and DC 4X4's and PreRunners) you can't simply assume "non-TRD = good to go."



I found a set of 3.58 ring and pinion out of a 97 4x4 taco 4cyl.I am guessing it would be the 8.4 since the E locjer didnt come out till what 98 or 99.Do you think that is usuable or should I not go for the 4cyl version. I would think its pretty strong since it is the 4x4 one and its a toyota ring and pinion. They are asking 125 for it

NOTE: According to the 1997 Tacoma spec sheets (from Toyota.com) the 3.58 final ratio was stock on only one Taco type - the 2.4L **2WD** with the electronically-controlled automatic transmission. No Taco 4X4 had a final ratio of 3.58, according to the factory spec sheet.

(http://www.CustomTacos.com/ubbthreads/images/graemlins/shrug.gif No, I can't explain it - just reporting what's documented... http://www.CustomTacos.com/ubbthreads/images/graemlins/shrug.gif)

Taking this at face value, your 3.58 gear (a) isn't off a 4X4 and (b) wouldn't be from a '8.4' (later 8") differential.

In case this data would help with ID'-ing things.... The '8.4' differential supposedly common between SR's and XR's has twelve 12mm ring gear bolts and is a 30-spline pinion shaft. The earlier model diff's used ten 10mm ring gear bolts and a 27-spline shaft.

DAMN...is there any SR owners out there that did a gear change that could point me in the right direction

If it were me, I'd get in touch with an expert - i.e., contact a specialist shop / vendor.

Three that are often mentioned here on CT are Randy's, JAWS, and Drivetrain Specialties.

Be very careful when you buy gears. I personally only use Presicion Gear gears. They seem to be the best out there and every diff I have setup used the stock shims and it patterned perfectly.

There are some gears that are not cut to that level and the setup will drive you nuts trying to get it right. Another big problem is some venders do not carry the V6/trubo gear sets and will sell you the less strong 4 cly gear sets.

So, becareful what you are buying and don't just look for price because you may end up with something less then what you want and not know it.

I have always delt with Reider Racing as my gear source and they recently merged with Presicion Gear.

Gadget

Gadget:

Another 'name brand' I've seen mentioned a lot is 'Richmond Gear'. The Northwest Off Road website mentions something cryptic about Richmond getting into / out of making Toyota gears...

Got any opinion on Richmond?

... Just wondering ... Gears are on my mind now that there's a TrueTrac for the 8.4 (i.e., my '04 SR) .... http://www.CustomTacos.com/ubbthreads/images/graemlins/thinking.gif

I was looking at presicion but they only state 8" on their web page. I dont mind spending 200bucks for a ring and pinion set but not 800 like toyota wants.
Also on presicion page they didnt have anything listed under a 4.10 for the tacoma. Do they carry other ratios they just dont list or would they have to make it for me.
Thanks

I do not know anything about Richmond Gear.

You will love the TrueTrac. I have one in one of my 4Runners and I like it alot better then this crappy LSD in the XRunner. I will bet you that I will end up yanking it out and replacing it with a TrueTrac soon.

Gadget

I have no idea what they have or don't. I can tell you that they have had all the ratios I have every used in my 4x4.

Gadget

I am going to give them a call after 12:30 since they are closed for lunch

I called Prescision and the lowest they have for the tacoma is 4.56 So i guess they are out

Call them back and ask them which brand they recommend. You might be suprised at the info they give up to you.

Gadget

IS there an aftermarket one available? I know KAAZ makes one for the Tundra. This wouldn't happen to fit the Tacoma(specifically X-runner) also would it?

the truck comes with one already .

the truck comes with one already .



Yea ok, but that wasn't my question.

... Yea ok, but that wasn't my question.



All right, then...

The XR apparently uses the same '8.4' (heavier-duty 8") differential unit as some pre-'05 Tacos (e.g., the SR) and (at least some...) Tundras.

As of January 2005, there's (finally!...) a listing for a Detroit TrueTrac LSD for the 8.4 rear ends. The TrueTrac is a gear-based unit, in contrast to the clutch-based Eaton / TRD LSD's. There's a general consensus (at least in theory) that the TrueTrac is a better bet than the clutch-based Eaton / TRD LSD.

... And here's the (recently updated) thread where we'd been discussing the introduction of the 8.4 TrueTrac:

http://www.customtacos.com/ubbthreads/showflat.php?Cat=&Board=srunnertalk&Number=425767