Quickly searched it up and found a thread on adding a diff lock option for a 2001 300 arctic cat so wondering if theres anything possible for a suzuki 400. I dont know much about these quads so dont know if its even possible whatsoever.
Here is the thread I was talking about http://forums.atvconnection.com/arct...diff-lock.html

 

Bump, anyone have any info about this? Anything at all would be helpful.

 

I kinda doubt anyone is going to know. The 300 cat is a 300 suzuki copy, that's why the suzuki diff will work on the cat. The 400 is uncharted territory.

I have a diff from a 250 4x4 and can give you measurements and spline counts if that will help. Because its a 400, everything is probably bigger. The 300 is really a 280 and that's not far from the 250, so the diffs are the same.

 

I don't have much knowledge when it comes to this stuff so probably would not get far with measurements and spline counts. Thanks for the offer though. Was just curious if there was a trick to lock the diff in when I need it but I have noticed there isn't allot of information on these quad so probably not gonna find anything.