Or will the whole swing arm assembly change over? Not sure of the gear ratio's either. If not, how much is a good used rear diff from the 86 350 worth? (CDN) I notice used rear diffs are pretty scarce.

 

Not think will work. 350 fourtrax has two rear shocks,and final drive case and gears are different size,has axle housing tube,. What do you need? I can get aftermarket one for 300 fourtrax

 

Thanks Papa. The ring and pinion are shot and judging by the fluid so are all the bearings. So it would be easier if I changed the whole complete housing assy.
Kel

 

If you can find an good used one be good But make sure its not almost in the shape your is. If you are going to keep atv than put an aftermarket gear set and replace all the bearings and seals then you will know what you got when done.