300 Fourtrax 2x4 ring pinion gear into 250 Fourtrax 2X4 Dif

8419 Views 26 Replies 4 Participants Last post by retro, Jun 20, 2017

87Fourtrax25

Discussion Starter · Jun 19, 2017

So I was wondering if it's possible to use a 300 Ring pinion gear in a 250 Fourtrax Rear diff.. I'm going to replace the bearings and seals, but my 250 Fourtrax's rear end sounds way worse .. it only grinds doesn't move at all so I figured there's gonna be more than just replacing some bearings to it.. All i can find on ebay is a 300 Ring pinion gear.. its cheap.. I want to keep it that way .

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87Fourtrax25

Discussion Starter · #21 · Jun 20, 2017

retro said:
You mentioned earlier that you have new wheel bearings for your rearend I think..? Are they OEM? If not, then they are most likely china junk. Whether they are OEM or aftermarket branded, you'll need to pop the rubber seals off from them and pack some high quality grease in each of them. Bearings nowadays are shipped out by the manufacturers with insufficient grease in them... china made bearings may only have a trace of yak fat in them... wash those out good in solvent and blow them dry, then pack them with high quality grease.

Be careful taking those rubber seals off... use a very small and narrow flat blade screwdriver to begin to pry it out on the outer diameter of the seal only. Never poke anything under the seal lip on the inner diameter of the seals cause they are thin and fragile and will be ruined if you try. If a seal gets bent a little when you are popping it off, flatten it back carefully in your fingers before walking them back in place by squeezing the outer diameter (and sliding your fingers along) of those seals between your fingers carefully.

You'll get decent bearing life by repacking... and you'll be buying them again if you don't.

they're cheap china ones pretty sure .. i'll see if i even install them in the new diff i ordered.. may ride it out with whats in the new one if they are any good. the shaft I'm looking for is a 250 fourtrax rear end 85-87 like what my fourwheeler already has since the king nut won't come off.. the rear end diff i bought is the atc 250 rear end..

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retro

· #22 · Jun 20, 2017

87Fourtrax25 said:
they're cheap china ones pretty sure .. i'll see if i even install them in the new diff i ordered.. may ride it out with whats in the new one if they are any good. the shaft I'm looking for is a 250 fourtrax rear end 85-87 like what my fourwheeler already has since the king nut won't come off.. the rear end diff i bought is the atc 250 rear end..

Sounds good, have fun with it!

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87Fourtrax25

Discussion Starter · #23 · Jun 20, 2017

retro said:
87Fourtrax25 said:

they're cheap china ones pretty sure .. i'll see if i even install them in the new diff i ordered.. may ride it out with whats in the new one if they are any good. the shaft I'm looking for is a 250 fourtrax rear end 85-87 like what my fourwheeler already has since the king nut won't come off.. the rear end diff i bought is the atc 250 rear end..

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Sounds good, have fun with it!

I ordered my new axle for 87 250 fourtrax.. hope everything goes well.. thanks for suggestions (If i do use the new bearings like i should.. lol i'll try what you said about greasing them.) Thanks for all the help! I'm sure i'll be back with some other issues.. lol got a new starter to put in and such.. she's old n rough but it'll be a good machine again..

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87Fourtrax25

Discussion Starter · #24 · Jun 20, 2017

Any one know if there is suppose to be a spring with the drive shaft when it comes out? or did I knock something free from the transmission yoke??

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retro

· #25 · Jun 20, 2017

Partzilla is your friend...

Honda ATV Parts 1986 TRX250 A SWINGARM Diagram

Clean & repack your old wheel bearings too... they will live for a long time well maintained.

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retro

· #26 · Jun 20, 2017

There are no shortcuts throughout life that will allow you to avoid consequences. Any job worth doing is worth doing your best! So, do your best and you'll be rewarded, do less than your best and you'll suffer the consequences... pop the seals off from those wheel bearings and repack them all...

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retro

· #27 · Jun 20, 2017

Clean & repack the swingarm bearings too. Replace any that are worn into the outer race a lot or have rusty appearing grease in them. If the seals are going bad replace those too. Else I may grab ya by the short hairs an' flog ya...! lol

I'm sure you'll do a great job...

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