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06 RM 250 Transmission compatibility- RM guru please advise

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Can I swap the entire transmission from an 06 RM 250 into 03 cases? After hours of research, it seems that I should be able to swap the entire transmission into the 03, all the driven gears have the same part numbers and the 4 and 5th drive gears have the same part numbers. I am thinking they beefed up 1st 2nd and 3rd gear which explains the difference in part number for 06 but I just want to know if the entire 06 transmission will fit into the 03 cases.

 

The only real difference I can see in the cases are the 03/04 use different crank main bearings and right side seal then the 05/06.

 

I just lost the motor in my 06 (rod went through the cylinder and cases) I got an 03 motor but I want to swap my 06 tranny because it only has 15 hours on it.

 

Please confirm if I'm correct in my research.  

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Can't do it suzuki changed the tranny in 04 -08 to k4,k5 models

Have you tried? I understand they changed some parts, however If you are trying to swap all the parts I have been told that the cases will accept any year tranny 03-08. 

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From what I remember from my 03

123 gear is different aswell as the shifter forks and drum @ the case is a little diff aswell

But I havnt tried to swap an entire tranny so It wouldn't hurt to try n if it doesn't work you can always resell the cases

And the k123 tranny is the same from 2000 to 03

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