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Old 08-01-2010, 03:18 PM   #1
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how to change oil in rear diff currie

so I have changed the oil in everything in my jeep since i got it except the rear diff. I was told it is a Currie high 9" ford with detroit locker and 4:88 gears. Do i have to disconnect the driveshaft and undo the front housing on this just to change the oil i didnt see a drain plug and i couldnt get a hose inside the fill plug/hole to suck out the fluid as thats what i did on the front diff. Is anything going to fall out or get out of sync if i undo the front cover of this and also do yall think 75w-140 royal purple gear oil would be fine to use.

Thanks for the help
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Old 08-01-2010, 05:28 PM   #2
Knows a couple things...

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I've not worked on a 9" but I'll ask a friend who does.

Do not use a synthetic gear lube, especially in a Currie rear-end since Currie's warranty requirements specify mineral-based gear lubes only. Currie, after much work and to their surprise, discovered synthetic gear lubes cause R&P gears to fail more quickly due to heat buildup.

The very best lube you can use in that rear end is Torco 85W-140 which is a mineral-based GL-5 gear lube. Currie resells it on their website, relabeled with Currie's name on the label.

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Old 08-01-2010, 06:04 PM   #3
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Here's what my friend recommended...

"Pull axles, pull third member and catch oil as it drains, swab out the rest with many paper towels, clean surface on both sides, put down thin layer of RTV, install gasket, thin layer of RTV on gasket, reinstall third member.

Don't forget that the washer you removed under the nuts that hold the third in are crush washers and should be replaced to make them seal correctly."
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Old 08-01-2010, 07:11 PM   #4
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I'll swap you a 35 for that!
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Old 08-01-2010, 08:47 PM   #5
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DAMN that's a lot of work to replace the gear lube!
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Old 08-01-2010, 09:34 PM   #6
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Thanks for the help and yes that is a ton of work just for gear lube

I might tr to call currie in the morning to get the right fluid and to make sure that is the best way to change the fluid out
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Old 08-02-2010, 03:34 PM   #7
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Its easier than you think.Just remember that center chunk is gonna be heavy.

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