WR Trans in YZ426?

I imagine that the WR426 tranny interchange without a problem but what about like a WR450 tranny? Does anyone know if either of these are compatible and a direct swap into a YZ? I feel the gears on my 426 are to damn close together, it blast thru 1st thru 4th like its nothing

None of the 450 transmissions will interchange with any of the 426's. 

 

An alternative to the either/or situation presented by the question of which trans to use is mixing ratios from one to the other.  I installed the 4th and 5th gears from a WR450 in my '06 YZ450 to give it longer legs for desert races.  I still have a close ratio 1-3, and the first 4 gears are an exact duplicate of the ratios in an '03-'05 4 speed, plus the WR 5th.  Something to give some thought to.

Whats the difference in ratios between a wr426 5th and yz426 5th?

WR is .840 vs. .952  or 14% higher

 

WR426:

2.416
1.733
1.312
1.050
0.840

 

YZ426
1.846
1.533
1.278
1.091
0.952

 

YZ450 4 speed (for reference):
1.929
1.563
1.278
1.050

Looks like im going to change out 4th and fifth in my yz with 4th and 5th from a wr, i like those ratios. Does anything have to be done with the shift forks or the shift drum?

Nothing.

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