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I'm new here, first post. Purchased this '93 Fourtrax and have replaced CV Boot, new brakes on rear, hydraulic cylinder kits on front, general clean up, oil change & filter. Adjusted carb - runs good. 1. Downloaded Operator's Manual but no where in the manual does it tell me what lube for Front Differential and what level of lube. 2. When adjusting front brakes with wheels off floor I noticed the wheels won't turn - Full Time Locked 4 wheel drive? Thanks in advance to anyone who could give me this information.
 

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Welcome to the forums! Hypoid 80 gear oil is what you need, n both front and rear, here's a pic of the check plug, just fill it till bottom edge of the check plug hole and cap it n you be good to go! fourtrax 300s fwd have a clutch pack in the front dif, they aren't locked fronts, but there is a string in the forums about how to posi lock , i my self wouldn't do it...lol! I'd OP for a 424 kick out.
 

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Plus 1 on belray oils
 

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It tells you on the diff which grade oil to use...

Edit: Welcome to the forum :)
 

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Just make sure it is Hypoid Oil and not regular 80W. Unlike regular oil, hypoid gear oil is designed to operate effectively with hypoid gear designs under extreme pressures.
 

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Thanks for mentioning the transfer case guys. Just so you know @2Kings the chain case bolted to the front of the engine also requires lube. Read the manual from the link below
 

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I use Gn4 for the t case, i put in a splash of Lucas in there, and in the REAR pumpkin, (none in the front) fish is a mud bug lol, he uses the extreme pertection as would i, if i was a mud bug>> (seat deep mud)
 
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the OEM 300 rear ends taught me about keeping good clean oil in the rear ends , they ate me up , I went thru so many rear ends , bearings and seals , couldn't keep the oil in and water out , I must have 15 OEM 300 rears or more laying around here , I switched to the 250/350 rear ends and started using Lucas Hub Oil in them and have never torn up a diff in a 250/350 diff , yet , my wife's 300 and my blue 300 run Marine grease in front and rear diffs and transfer cases , I don't have a lot of time on the blue one yet , but the wife's bike has many hours on it , I shoot them with grease every trip , I really don't know , but seem to think the grease in the front diff makes the front grab better , I have rode her bike many times and watch her going thru and both her front tires are always turning , now maybe the PO has shimmed the diff for traction lock , who knows , but I have oil in the front of my red 300 and it don't pull the same as hers
 

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chain case bolted to the front of the engine also requires lube
fourtrax 300's don't have chain driven T-case, they are gear on gear.

some years required 10w40, later models brought up 80w hypoid, either way, you can run anything from motor oil all the way to ATF, it all works.
 

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chain case bolted to the front of the engine also requires lube
fourtrax 300's don't have chain driven T-case, they are gear on gear.

some years required 10w40, later models brought up 80w hypoid, either way, you can run anything from motor oil all the way to ATF, it all works.


Yeah idk why they changed the specs on it I don’t think there was any change to the tcase over the years


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I'm curruois as to why different (t case) oils over the years? My shop book covers years 95-2000, those years call for gn4 or equal. IMO should be gear lube......food for thought.
 

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I run 80-90 gear oil in my T case.
 

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I'm curruois as to why different (t case) oils over the years? My shop book covers years 95-2000, those years call for gn4 or equal. IMO should be gear lube......food for thought.
I would have to guess that Honda learned that a different oil done a better job , maybe it was too thin and causing leakage , I have never had any problems with a transfer case other than seals -------

Bobcat for years used the same oil in the engine as in their hydraulic/hydrostatic systems , then they realized that the engine oil has something in it that was deteriorating the seals quickly , they sent out a bulletin and switched oils in the hydraulics , I can a test to the seals lasting a lot longer now
 
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