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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 04-26-2007, 09:01 AM   #1
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Rear Differential Leaking Oil and Making Grinding Noise????

I have a '96 4x4 4runner with the e-locker. My differential recently started leaking oil from the rear driver side and now it started making a grinding noise around that same side drum? Is my differential busted or has my seals and bearings gone bad? Anybody else have this problem or has had this problem? I have no idea what it could be because the car still drives and it just makes a nasty grinding noise.
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Old 04-26-2007, 09:48 AM   #2
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Oil likely started leaking because your breather is plugged solid. Differential heats up when you're driving, pressure inside goes up unless your breather is working to relieve it, then gear oil gets pushed out through the weakest seal. Check out the breather... it sticks out approx 3/4" on the top side of your differential. When the gear lube leaked out (only one way for the lube to get out and that's through your sealed bearing), it has likely washed all the grease out of your bearing, leading to the noise.

Replace the breather with a threaded nipple, hose, and small inline filter run up to behind your gas filler door (Search for "extend differential breather". Lots of threads on here), replace your bearing and oil seal, and you should be good to go. Lots of threads here on bearing and seal replacements too.
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Old 04-26-2007, 11:07 AM   #3
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Thanks GSGALLANT. Any suggestions where I could get a good bearing and seal kit or should I just go to the local parts store?
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Old 04-26-2007, 11:25 AM   #4
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I haven't had to replace mine yet, but I plan on getting the parts directly from Toyota when I do have to replace them. The seal is cheap $15-$20, and the bearings up here are $100 CAD from the dealer. I suspect you can get one in the US for $40-$50 though. Markup is terribly high up here.

PM Phil (Member name on here: Strap22). He can probably get you as good a price as you'll get anywhere.
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TJM T15 Front Bumper & Warn M8000, 4xInnovation sliders, Sonoran Steel 1.2 Lift, Toytec LCA Skids, Tundra Brake Upgrade (231mm), Extended rear diff breather, Deckplate Mod, Andymod, Dual batt setup with Optima blue top aux battery, Hardwired 1000W inverter, Aux fuse box, Full time power to 12V plugs, Yaesu FT7800R Radio, "4-air" system for airing up/down tires.

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Old 04-26-2007, 11:25 AM
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axle, brake, constant, differential, end, grinding, leak, leaking, noise, oil, rear, supra, toyota, transmission, tundra

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