is this trx350 an old model ?..if so..no..you cannot swap them out..the old models use an outter race bearing tube to hold the rear diff together. you didn't state which diff..front..or rear ?..i'm guessing the rear ?..if so..no..the outter case will not work..now..as far as the ring gear..pinion gear..i'm not 100 percent positive..but..i do know for a fact < i just used a rebuild kit for a 300 in my trx350d foreman > that the seals are the same !..the ring gear..pinion maybe different !..yu'll need to count the teeth and so forth on those. if you have never rebuilt a diff..and need some advice..holler at us..we'll point you in the right direction.I am going to hit a couple of salvage yards and ebay looking to replace my noisy differential. What different models and years would fit my 93? I found an add for a TRX350 Fourtrax Rear Differential final drive that looks similar but who knows.
I agree with you on that Shadetree. LOL.before you go out..and fork down alot of money on parts you may not need..you should take your diff out..and apart..and see what part is bad...if it's just the bearings and seals..thats a fairly cheap fix < providing you got the tools to do it >..it takes a couple spec tools < or home made ones < see's a comment comming from helmut here >..i would start there first.
If you don't feel comfortable doing the work, then I would have someone else do it or just go ahead and buy the whole differential. It will be a lot more expensive that way, though.I just been a little nervous trying to fix it myself. I kinda of learned in the past. I am 90 percent sure its just the bearings but I hate to take the ring off and then not put it back on correct and shell everythiing.
lol..thats why were here..to help you take it apart..and charge you a fee for telling you how to put it back together !!!j/k..lmfao..you get it apart...get all new bearings and seals..we'll guide you the rest of the way..lol.I just been a little nervous trying to fix it myself. I kinda of learned in the past. I am 90 percent sure its just the bearings but I hate to take the ring off and then not put it back on correct and shell everythiing.