Paging *Shane* Shep soon to release HD 4th gear.

[Pushit2.0]

Yes I bought the Evo 3 1st gear and input shaft, the full Evo 3 3rd/4th gear kit from jacks, And I am using a 92 intermediate shaft and center diff.

As for shims I fallowed the factory services procedure. I have it torn down now and from what I can see the gears are holding up great, I used the mitsu diaqueen oil. This tranny shifted like butter at 9500rpm.

~John

[FattyBoomBatty]

Straight cut gears should reduce spreading of the shafts, right? So, this will be better because it's straight cut. I don't know anything about stock or evo 3 4th gears though, whether or not they are straight or helical cut.

[Pushit2.0]

All dsm and evo 3 forward gears are helical cut. Look at the pic again, its a helical cut gear.

[FattyBoomBatty]

If it does have a helical cut, it's pretty slight. You can have straight teeth at an angle, can't you? It would just increase strength.

[Halon]

When saying straight cut, typically this is what people are referring to (straight cut dog gears like this):

http://minishop-portugal.com/loja/images/DSC00585.JPG

The generate much less (if hardly any at all) side load than a helical gear would generate.

[FattyBoomBatty]

I know, but it is possible, isn't it, to have straight teeth, at an angle, but without the helical (curved) pattern?

[Halon]

Helical Gear - A type of gear with slanted teeth.

Spur Gear (aka straight cut gear)- A type of gear that has straight, flat-topped teeth set parallel to the shaft


Taken from http://www.toolingu.com/definition-560100-25038-helical-gear.html