New LC Differentials

[Brown98LC]

Undercarriage of the 300
50,000kms later of alot and I mean alot of offroading.
I was surprised how clean it looks.
Lots of beach driving
The fuel tank skid dent is sad though.

I pressure wash the undercarriage often so the dirt never accumulates

 

[Rednexus]

Just for clarity - the 8.9 or 8.7 whatever we end up calling it - it looks like it can have a front locker or a differential disconnect, but not both. Or at least not yet because it uses the same engagement mechanism for both options.

If it has the 2wd transfer case option with the diff disconnect on the new diff the engagement system connects the side spider to the axle shaft. Pretty straight forward. But if that's in there then there's no room in the case design to also fit the engagement magnet/cam system for locking the axle shaft to the carrier. In essence it would require two magnet engagement rings, one for 4wd and the second for locking it. I'm pretty sure it's possible to do both either with a 2 position clutch or with one on each side of the carrier. I'm sure someone will figure it out.

Are the fronts interchangeable enough that someone could just swap over the AWD front diff? Folks are doing that for Tacos sometimes, with a GX/4Runner limited front diff, to skip the ADD.

 

[cruiseroutfit]

Are the fronts interchangeable enough that someone could just swap over the AWD front diff? Folks are doing that for Tacos sometimes, with a GX/4Runner limited front diff, to skip the ADD.

In the case of the previous generation Tundra & 200/570, yes. You can use the Tundra/Seq front diff in the 200/500. The extension tube is where they made the change in full-time/part-time variants.

 

[NearJetties]

Diff on the GX550 Overtrail at the DC auto show. Axle housing has an RJ60 sticker in it

 

[Knowbuddy]

250 rear diff

 

[Joshuak172]

It’s seems there is more space between the LC250 and the GX550 than there is between the GX and the LX.

 

[Jeremy556]

Only a 1/4 fuel tank skid on the 250, wtf? My 4runner came with a full fuel tank skid.

 

[cruiseroutfit]

Only a 1/4 fuel tank skid on the 250, wtf? My 4runner came with a full fuel tank skid.

Good catch. The GX550 has full length. I'm curious if that is production.

 

[jdam]

Good catch. The GX550 has full length. I'm curious if that is production.

Wonder if it's a trim thing. Maybe the non-Overtrail 550s will have the 1/3rd length one as they did on the 460.

 

[TheLCProject]

Here's a new Sequoia Platinum rear diff.

 

[Joshuak172]

Here's a new Sequoia Platinum rear diff.
View attachment 3541053

Looks the same as the 600?

 

[TheLCProject]

Looks the same as the 600?

I don't know.

From the tech sheets posted previously and the photos, this is what I gather:

The hybrid Tundra (and maybe Sequoia) get the 10.7.
The gasser Tundra/Sequoia get the 9.7.
The J300, LX600?, most J252 (GX550) - likely all US models, and Trailhunter Tacoma all get the 9.5.
And then the LC250, some world market J252 (GX550), and the rest of the Tacomas get the 8.2.

We still haven't seen anything production for the 250 as far as I know but all of the photos of pre-production units appear to not match either the 9.5, 9.7, or 10.7, despite statements from others.

Perhaps the lower power and smaller engine (4 cyl) are going to bring the 8.2" rear diff but there appear to be exceptions (like the Trailhunter Tacoma). As I understand it as well, the J120 and J150 had the smaller diffs (8.2") so it wouldn't be unheard of to carry that on for the light duty platform.

It might also be worth a distinction too to separate the US-designed models (Tacoma, Tundra, Sequoia) from the Japan-designed models. The same building blocks are there for each but I can't imagine that some of the cultural differences in chief engineers don't bleed through into the final product. (i.e., a Sheldon Brown product might be a little different than a Koji Tsukasaki or Sadayoshi Koyari product).

I'm waiting the North America technical data from @OGBeno (if he obliges). Otherwise we wait...

"Don't let an often game spec on paper sway your opinion. We know the Toyota engineers wouldn't put the Land Cruiser name on it if it wasn't up to the task." - Kurt Williams

 

[Jstawgn]

One benefit of the 8.2 if they are the same is availability of different gear sets. 3.73 from 5th gen 4runner would bring it back to stock with 35 and 3.91 from GX460 would be good for 37. Not sure about the front.

I cannot find any aftermarket gear ratio for 300 series land cruiser. I might be searching wrong term. Looked in Australia and no one mention regearing their 300 series.

 

[Jetboy]

FWIW the non-offroad trims of the 5th gen originally had the half skid (more of a rock deflector).

Also worth noting that the current 8.2 rear axle does not have a multi piece welded design. Also the drain plug is on the other side - so if this is an 8.2 it's not using the old housing. It's a single stamped housing. All of the newer diffs look like a 2 part top/bottom with more square profile beam and welded on plates at the diff cover along with the welded on diff covers. A lot more parts and processes involved in the new rear axle manufacturing. Curious why the change.

There is another OEM gusseted 8.2 OEM housing, but it's still quite a bit different from the new LC250:

And - does the 8.7 or whatever it is called from the Tacoma/Fortuner continue in some versions or is that dropped entirely?

 

[Jstawgn]

All LC250 in US would get 3.538 gear same as Tacoma.

This does not make sense. Overtrail gets smaller front diff?

Based on this overtrail is 3.538 geared as that is the only locked version available.

I think
1 is open
2 is locked
3 is Torsen

This start to make sense. The only one that would get 9.5 BD24 is TRD sport MT with open diff and TRD off road MT with locking diff.
All the Hybrid and other would get BD21 and line up with Land Cruiser.

Sherrod Brown is not wrong it would get bigger diff, but only on MT equipped. MT are a lot harder to drivetrain due to more shock loading.

Now the fun stuff is on Overtrail with Tacoma MT gearing (4.30/3.538)x32.5=41.6" tires
38-39" would give stock performance

 

[Jetboy]

The Tacoma forum folks are saying that all hybrid and MT 4x4 models get the 9.5. I think we should know pretty soon when the part numbers get released.

 

[TWILLY]

Based on the spec sheet above, for Tacoma, gear ratios denote size among locking diffs, where the only 9.5 locker, BD24DN, is 4.3 ratio, and the 8.2 locker, BD21CN, is 3.583. Toyota’s website lists a 3.583 ratio for the Trailhunter and TRD Off Road hybrids; unless the spec sheet or website is incomplete/incorrect (such as those trucks using BD24CN, which is 3.583, like the GX, or another larger locking diff with 3.583), those hybrids, both with locking diffs, presumably use BD21CN… Unless I’m missing something (entirely possible).

Edit: I was apparently missing the fact that the Tacoma spec sheet is in fact incomplete and does not include diff spec for hybrid models.

 

[Jetboy]

Based on the spec sheet above, for Tacoma, gear ratios denote size among locking diffs, where the only 9.5 locker, BD24DN, is 4.3 ratio, and the 8.2 locker, BD21CN, is 3.583. Toyota’s website lists a 3.583 ratio for the Trailhunter and TRD Off Road hybrids; unless the spec sheet or website is incomplete/incorrect (such as those trucks using BD24CN, which is 3.583, like the GX, or another larger locking diff with 3.583), those hybrids, both with locking diffs, presumably use BD21CN… Unless I’m missing something (entirely possible).

View attachment 3554716

I don't think the parts spec sheets include the hybrid yet. Toyota is years behind on all of this and I think that may be part of why it's such a train wreck of a rollout. The max torque on the rear end will be in 4lo in some off-road scenario. I think the auto would be just as hard on it as the MT. Probably more torque than the little flywheel on the T24A has to drop. But I'm just guessing.

 

[TWILLY]

I don't think the parts spec sheets include the hybrid yet. Toyota is years behind on all of this and I think that may be part of why it's such a train wreck of a rollout.

Ah, I see - I was missing something. Thanks.

 

[TheLCProject]

Added this above.

2024 Tacoma TRD Bro (with iForceMax, I think) It had a prototype sticker on it though.