xB final drive swap

[Jason@SportsCar]

If anyone is interested, we have done the xB final drive (4.312) swap in our Yaris, fits and works perfectly.

Parts needed from Toyota/Scion:
33321-52110* this part has been superseded new number is 33321-52111 output shaft
41221-52270, ring gear
90105-11040, ring gear bolts (8)

Depending on mileage you may also want to replace bearings and seals, but you don't need to source those from Toyota.

[2manywheels]

Thanks for the info man!!
CUrious.. what does that do for the Yaris??

[Jason@SportsCar]

Originally Posted by 2manywheels

Thanks for the info man!!
CUrious.. what does that do for the Yaris??

Makes it accelerate quicker.

[2manywheels]

So.. if I had a second motor that was being "built" this could be a great addition to the package? I am assuming this is for the manual tranny

[darkMINI]

It works for manual or automatic, it changes your gear ratio. Similar to running shorter tires. Of course you will lose top speed considerably and your speedo will be off(reading faster than you are actually going), so if you do any highway driving ... you will be sad. :(
Nevertheless it's an awesome mod for the track and would probably benefit from the addition of a limited slip differential as well.

[Jason@SportsCar]

Originally Posted by darkMINI

It works for manual or automatic, it changes your gear ratio. Similar to running shorter tires. Of course you will lose top speed considerably and your speedo will be off(reading faster than you are actually going), so if you do any highway driving ... you will be sad. :(
Nevertheless it's an awesome mod for the track and would probably benefit from the addition of a limited slip differential as well.

The car will be quicker all the way to the 117mph speed limiter. Ever driven an xB, this is the same gearing.

You would think the speedo would be off with a gear change... But Toyota must be pulling the signal from the output shaft, or axle, because ours did not change at all. Its not like doing a gear change in a rwd car where the signal is pulled from the trans.

[ROCKLAND TOYOTA]

RING GEAR part# for AUTOMATIC is: 41221-52090.......

[hatchbackkid82]

Just called my local dealership they want about $580 for all the parts Any one know if this mod is really worth the cost of the parts and the hours spent taking the tranny apart?

Why not just get the XB tranny?

[Tamago]

Originally Posted by hatchbackkid82

Just called my local dealership they want about $580 for all the parts Any one know if this mod is really worth the cost of the parts and the hours spent taking the tranny apart?

Why not just get the XB tranny?

if it's worth it to you to have shorter gears, then it's worth it

the actual transmission case will not fit without modification (from the xA or xB) in the yaris (confirmed by Morgan)

however, you could purchase a used xA/xB transmission from car-part.com or a local junkyard for less than $200 and disassemble it yourself, you'd only need to buy wear-parts from toyota.

be careful that you don't purchase a transmission from an older ECHO, as they have a 6bolt ring gear, and the scions have an 8bolt ring gear.

i personally HATED the short gearing in the scion. 4300rpm at 80mph was annoying, and did not yield very good mileage. the ECHO transmission i had in the xA was awesome, and my mileage improved almost 10%. the only time i missed the shorter gears was on very tight autocross courses.

[hatchbackkid82]

HOLY CRAP 4300rpm at 80 mph

It's like you were always in VTEC

That would be hell for me considering, I have a modified nitto mid pipe with one resonator

Originally Posted by Tamago

if it's worth it to you to have shorter gears, then it's worth it

the actual transmission case will not fit without modification (from the xA or xB) in the yaris (confirmed by Morgan)

however, you could purchase a used xA/xB transmission from car-part.com or a local junkyard for less than $200 and disassemble it yourself, you'd only need to buy wear-parts from toyota.

be careful that you don't purchase a transmission from an older ECHO, as they have a 6bolt ring gear, and the scions have an 8bolt ring gear.

i personally HATED the short gearing in the scion. 4300rpm at 80mph was annoying, and did not yield very good mileage. the ECHO transmission i had in the xA was awesome, and my mileage improved almost 10%. the only time i missed the shorter gears was on very tight autocross courses.

[Tamago]

to answer the speedo question from earlier:

because the speedo ring gear turns the same speed as the axles, changing the ratios before it would not affect your speedometer readout.

it's possible that ABS equipped yarii derive speed from the wheel sensors themselves, but that would be a question to be answered by CTscott or someone who's looked over the ecu wiring for ABS/NON equipped cars.

[cali yaris]

Just called my local dealership they want about $580 for all the parts

You can pick up an xB trans for less than $500 and just pull the parts from that.

[Tamago]

Originally Posted by Tamago

however, you could purchase a used xA/xB transmission from car-part.com or a local junkyard for less than $200 and disassemble it yourself,.

Originally Posted by cali yaris

You can pick up an xB trans for less than $500 and just pull the parts from that.

exactly ;)

[Jason@SportsCar]

Just make sure if you are going to the trouble to do the gear change you put in an LSD at the same time.

[Jason@SportsCar]

Originally Posted by hatchbackkid82

Just called my local dealership they want about $580 for all the parts Any one know if this mod is really worth the cost of the parts and the hours spent taking the tranny apart?

WOW, we got ours from TRD for a fraction of that. TRD racer support program: http://www.trdusa.com/thegarage.cfm?team=grassroots

And after racing the car at Miller this past weekend, the gear change has been one of the most effective mods yet.

[2manywheels]

Any footage from Miller?? :)

hehe..
Video whore here.. lol

[Jason@SportsCar]

Originally Posted by 2manywheels

Any footage from Miller?? :)

hehe..
Video whore here.. lol

There will be.

[2manywheels]

Woohoo!!
Thanks for keeping us on on your trials and ventures!!!