we haven't replaced seal yet ,,, looks like it would be a big project so was weighting till winter to do it ,, you mite be one of the lucky ones and not have to replace the seal ,, I would try the O ring first if isn't leaking to bad ,,, have you broke any axles or bent tie rods yet ,,if you do much hard riding thats next ,, there are some places to get some good after market axles atvonics.com and I can help you on the tie rod things