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Old 12-09-2012, 08:11 AM   #1
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2004 LJ-need reccommendations

My son just purchased a 2004 LJ with 103,000 miles and we are in the process of replacing all the fluids. It has 4.0L I-6 auto with the 42RLE transmission, front D30 and rear D44 axles.

We found small leak at front corner of tranny pan, so I was thinking of using the Lube Locker gaskets for the diffs and tranny pan. Which gear oil and do I need to use additives?

I'm a JK guy so any advice on the TJ/LJ will be helpful.

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Old 12-09-2012, 08:41 AM   #2
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The rear is a limited slip so just make sure whatever diff fluid you use in the rear has an additive. Just check the back of the label. I use 90 weight and RTV no gasket on rear.

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Old 12-09-2012, 09:33 AM   #3
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I don't use gaskets for the diff covers either. And as stated.... use a gear oil that has the additive in it. I use Lucas 85-140 in both diffs. My rear is a trak loc and front is open....
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Old 12-09-2012, 03:00 PM   #4
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Make sure the tranny pan bolts are tight. I thought I had a rear main seal leak, because the oil pan showed signs of leaking and what not. guess what?! The fricken dealer mechanic didn't tighten all the bolts the last time I had it in for work. Infact, 1 bolt is missing. I will never use a dealer mechanic again! Too many strikes against the supposed professionals.
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