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1985 Honda TRX250 Fourtrax
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Will an ‘85 Fourtax 250 rear diff directly swap onto an ‘88 Fourtrax 300? If not does anyone have a good ‘88 rear diff? (Hey, never hurts to ask).
 

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Not directly - you may have to change the swing arm along with the brake assembly (if it will fit the 250 frame) - the short answer is no. BTW, it's not a differential - it's simply a rear drive gear case - the axle is solid from one side to the other (live axle).

Also to aid in your search, the rear gear case was the same for 88-94 TRX300 - to the best of my knowledge, no other gear case is a direct swap.
 
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