MRT Unbreakable Gear Sets

For some time now MRT have been at work with this new kit. With the Impreza comes some limitations, and we all know that as a production car its great, but the when pushed to the limit with engine modifications or if you get a bit abusive in your need to outpace that Mitsubishi Lancer beside you, it needs some help.

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For a brochure on this gear set click this link.

This kit is designed and manufactured in Australia. The ratios that are currently available are made for 4.1 and 4.4 gear sets based on the group N homologation ratios, plus custom road, race drag sets are also available. The group N set meets FIA 2001 rules for rally cars.

The gear set has the following features that sets it apart from any other Impreza gear set (that we are aware of anyway!)

GEAR SET Features:

latest F1 tooth profile
caged needle rollers on 1st to 5th gears
en36a material, gas carburised
shot peened
2 piece input shaft
fits standard gear housing for WRX
STi gearbox housing requires 3rd 4th selector rod to be fitted from WRX gearbox
WRX gbox requires no mods to selection rails
gears are approx %20 wider than OE
approx %50 - %60 stronger than OE !
overall design is lighter than std, giving less reciprocating mass and better throttle response.
Bigger is not always better!
less drag on engine due to spur gear design and zero thrust
less gear casing load longitudinally
ratios easy interchangeable, each gear is available separately as are dog rings
dog rings feature 6 tooth on 1st 2nd and 8 on 3, 4, 5 giving easier gear selection when stationery....
Shafts and gears are NOT press fit, are splined (43) and not keyways like other brands.

Some companies are selling gear sets that look big and impressive; need major housing mods to fit them; or are a compromise on dog / synchro design, the real benefit of this set is that it was designed for genuine motorsport and MRT has basically offered a full G’Tee against breakage! Even in drag race use! Don’t be scared that it’s a Dog shift set, it is designed so that it shifts easily (with 6 dog teeth on 1st 2nd gear to help).

Email Sales@MRTrally.com.au if you need more technical data on this

Combination 3rd/4th Comp driven also shows speedo drive wheel. Original (standard OE) shown on right.
Close up of 1st driven gear. Note the different tooth shape, high quality and added width.
Gear showing dog rings.
Failed original input shaft at top, compared to MRT equivalent.
3rd/4th Input showing dog rings.
MRT alternative LSD on LEFT. STi Mech LSD Diff on RIGHT
Whole assy gearbox ready to be bolted to matching half of case.
LEFT: MRT Kit MID: Other brand non-genuine RIGHT: STi Shown with front pinion fitted.

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