my buddy is getting rid of his 450r and pieing off partd and is selling me his lonstar extended axel and i was just wondering if this thing will even fit on my quad

 

The axles are different on a 400 and a 450. I doubt the lonestar will work.

 

Hmm good ? i doubt it would work but you can give it a try and see I would get the carrier and hubs etc from the 450r also and give it a try before you go buying it from him you can try but I don't know if it will work of not.

 

i thought all hondas had the same rear end set up though minus suspenstion differences

 

I don't have a 400ex and never have so I couldn't tell you for a fact and the slines might be different on the axles I don't know just give it a try before buying it and if it works then buy it from him or buy a new one.

 

I tried it, owning both. I had a plus 4 swingarm for my 400, it didn't fit my 450r(correctly). They are really close but the chain would have been misaligned about 1/8 inch. All the parts seemed to be off that 1/8 inch, like honda did just to make me mad or something.