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Old 03-21-2006, 02:58 PM   #1
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Differential Drain

Ok so here is a stupid Question from a stupid Brit :o . What is the reason for not having a drain plug on the front and rear differential. In the UK our trucks spend their life in deep sticky mud and deep water so one minute everything is nice and hot and then the next minute it is stone cold . Even though I have all the breathers etc I personally still like to check the oil in the diffs, gearboxes etc for water on a regular basis, but this is going to be a real balls ache on my 97TJ

Everyone I speak to (who dont know Wranglers ) say that there must be a drain plug, I say there isnt we then get onto the conversation of why not

Who knows the answer??

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Old 03-21-2006, 03:04 PM   #2
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I've often wondered that myself, but have never seen nor heard from DC as to why they don't.

I'm assuming a couple of reasons.

A. Maybe because they can't get the plug low enough on the stock covers to allow the diff to drain completely. Since they are pretty small compared to a 14 bolt or a dana 60.

B. Another thought would be that in order to full maintenance your diffs it's a good idea to remove the covers and look at the ring gear and carrier. Also to see if there is any metal floating around inside.

However you can buy aftermarket high strength covers that do have drain and fill plugs built into them.

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Old 03-21-2006, 04:14 PM   #3
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Yes it is a Pain..,

My Nissan Titan's rear end was built by Dana for Nissan and it has a drain plug in the bottom of the case !

Sweet..
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Old 03-21-2006, 05:33 PM   #4
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Is there (I guess I could go look) a fill plug? Normally I would stick a finger in to see the color of the fluid, then top it off if needed. But would I be missing the water, does it (A) hang out in the bottom (heavier than lube) or does it (B) float on top so I could notice it on my finger, or (C) mix so the lube looks milky? Just curious.
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Old 03-21-2006, 05:40 PM   #5
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there is a fill plug. if ur fluid is water contaminated, it will look milky
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Old 03-21-2006, 05:48 PM   #6
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If you had water in your diff. it would turn a milky color. Chrysler recommends the diff fluids to be changed every 12,000 miles anyway. As long as your vent tubes are up high, I don't think you would have any problems with it. I also think that a reason for not having a drain plug could be so that you inspect your gears, while changing your fluid. Have been involved in re-gearing several Jeeps, and it was very evident that a visual inspection was well warranted. Everything from milky oil, to chewed up spider gears.
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Old 03-22-2006, 12:24 PM   #7
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A drain plug on the Bottom would be prone to being tore off wouldn't it? Sounds like a bad idea for a 4x4 to me.

If you want to change your fluid often without removing the cover you could pump it out, you won't get all of it....but beats pulling cover every time.

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Old 03-22-2006, 03:42 PM   #8
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Quote:
Originally Posted by NY94YJ
A drain plug on the Bottom would be prone to being tore off wouldn't it? Sounds like a bad idea for a 4x4 to me.
nope, its a flush plug hole cast into the case.. nothing sticks down to get tore off.

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