question about honda fourtrax rear differential
No rear differential swaps with the TRX300. The old 250 models were close enough that you can use a couple pieces, but the main parts you will need arent compatibile.
Any TRX300 rear diff will fit yours, but if you decide to go new, get one for a 99-00 model. They were made in the states rather than Japan and are several hundred dollars cheaper than the older model versions. The only change they made was the seal on the left side. If you go with this version, you will need to also buy the washer that rides up against that seal. It runs about $7.00 The late model rear end will set you back about $600.00 depending on the dealer.