GR Yaris Gearbox with diff?

Yes LSD is inside gearbox it’s the final component that connects to the driveshafts. 👍🏻 £2k 😲😲
 
Ah brilliant, thank you, so I just need to confirm this is from Circuit Pack in that case!

And yeah £2k is rather painful but I believe they're far more expensive from Toyota. Plus it could be useful to have a spare 'box.
 
Had a reply from seller and now I'm more confused so let's see what you guys reckon:-

Thanks for your message.
This is sold as per the images.
The front transfer box is not included . It is listed below -


Our car was the Circuit model yes.

Is the LSD part of the transfer box or has he misunderstood what I'm asking?

And yes, £2k again - oof
 
I have just spent ages looking at the parts catalogue. The diff is definitely in the gearbox case.

It is hard to read as they are on very different pages, but I think there are concentric shafts (one slipped inside the other), with the outer one driving the transfer case and the inner one running through and on to the right front wheel.

The outer one attaches to the diff ring gear so is driven at the fixed gearbox output rate, and the inner one fits to a spider gear so is 'differenced'.

This is similar to the Celica GT4 (although that was 3 nested shafts!).
 
Thanks Ventris, think I'll give this a miss then but I really want to get a front LSD for mine at some point to finish the drivetrain.

Roll-on more deliveries and write-offs! 😂
 
Fitting the LSD is a bit of a job, as you have to split the gearbox case with all the fun that entails when it comes to aligning the gears for reassembly.

Buying an assembled LSD box, fitting it, and selling your open diff one isn't a terrible plan, but it does require having the funds to have invested for a while.
 
For the same money you could do it properly with a plated mechanical LSD, including labour.
 
These parts are from a Crashed GR CP, which had a massive impact on the drivers side and looks like it ended up on it's roof.
2 of the Wheels took a massive impact too.
I would avoid parts from this car as you don't know how much shock went through the drivetrain.
You may get a warranty, but the time and effort won't be covered if you find out one of the gears is whining or the gearbox is noisy! 🤷‍♂️
 
I see what you're saying but until there's a bigger selection of crashed GRs that's a risk I'll have to take. For what it's worth, the car I got the rear diff from looked a lot worse!

I hadn't considered a mechanical LSD but I think I'd rather stick OEM parts as can't be arsed with maintenance (GRMN diffs would be nice though!). But maybe I could be convinced... would a mechanical LSD work so much better than OEM torsens?

Anyway, I wont be getting this one but will keep looking, thanks for all the advice.
 
Just so you know.. The GRMN diffs also have a short maintenance interval!
Mechanical diffs are better in some aspects, however torsens get you quite far already and don't need an oil change every 5000 KM -> I think the performance trade-off would be worth it for most people to not have to change the oils all the time. If one of my diffs was to fail outside of warranty I would probably consider a mechanical diff, since I don't daily drive the car.
 
If you like the rwd feel, maybe not having a front diff could be fun, esp. with a plated rear diff?!?
 
Onehp said:
If you like the rwd feel, maybe not having a front diff could be fun, esp. with a plated rear diff?!?
Click to expand...
Yes, I don't feel I need the front diff as it feels absolutely fantastic as-is. I'd like it for completeness but I'm in no rush to get one.
 
@TheManWithTheStick

Other than getting the complete CP gearbox from a non front-ended write-off, a Quaife LSD might be an option.

Unlike the Cusco units that require shimming, the Quaife units are a direct drop-in replacement affair (as per Quaife’s recommendation). This is the difficult part of the job for any would be installer (shimming/preload/backlash).

In my experience with Quaife, albeit the rear differential, the LSD was closer to the factory WSM tolerance/spec (compared to the OEM open diff) when measured after installation when using the existing shims.

Garage Whifbitz sell the Quaife units & I believe they also offer installation too. I also know a company near Doncaster who wouldn’t be afraid to tackle this job provided you gave them all the associated single use parts (bearings/seals/bolts) as per the WSM.


Hope this is more a help than a hindrance,

Food for thought!
 
Do the Quaife diffs need regular maintenance? For some reason I thought all aftermarket ones did so OEM Torsen would be best for me. But if these are plug and play and forget then it's definitely an option!

Are they 'better' than OEM torsen though? I mean, would it be best to have matching diffs front and rear or would it be just fine with this on front and OEM on rear? Not dangerous or anything?

Hmm, you've got me thinking now... thanks for the heads up 👍
 
The Quaife ATB is just like a Torsen torque biasing differential & requires servicing exactly like the Toyota one does (same oil as oem & same change intervals). Quaife do supply OEM’s & are pretty well respected in the world of transmission systems. They say when testing these diffs on the test benches/rigs, the amount of torque they can handle will break the bench before the diff.

The ratio of torque biasing is a figure they don’t publish in regards to commercial advantage/purposes etc but I’d think it’d perform equally or better.

Plug & play as far as I know with the ability to keep your original gearbox etc (plus the replaceable bits like bearings/seals/torque to yield nuts & bolts as per the WSM)
 
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