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post #1 of (permalink) Old 12-15-2007, 12:51 PM Thread Starter
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Oil Change Front & Rear Diff

I have a 86 CJ7 and I'm going to replace my front and rear pumpkin seals and oil and my two questions are,

Is there a preferred oil?

Is there any thing I should be looking for and or preventive maintenance I should be doing while I have the covers off?

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1986 stock CJ7 rebuilt 4.2L 258 more to come
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post #2 of (permalink) Old 12-15-2007, 01:02 PM
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I don't know about prefered brands, however I did find it easier to fill the diff with fluid by finding a peace of hose that would fit into the fill port and long enough to stand up from underneath the jeep with a funnel in the other end,take the little tapered spout off of the bottle and pour it into the funnel instead of trying to squeeze it out of the bottle under the jeep at a screwed up angle.
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post #3 of (permalink) Old 12-15-2007, 01:35 PM
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Good thing you are pulling the covers off....it's good to do a visual check...look for pieces of metal....if you do find some....it's not exactly a good thing...most likely both pumpkins will be fine.

I like using the synthetic oil.....you pay a bit more but the friction resistance is a little lower.

One note:...if your AMC20 (rear) is a limited slip, then use the right oil otherwise your friction plates will not work correctly.

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post #4 of (permalink) Old 12-15-2007, 02:25 PM Thread Starter
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Thanks for the tips. I have my manual with me so I can look up the SN numbers to find out what I have. I'll post my findings.

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post #5 of (permalink) Old 12-15-2007, 02:56 PM Thread Starter
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How can I tell if it's a limited slip diff?

1986 stock CJ7 rebuilt 4.2L 258 more to come
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post #6 of (permalink) Old 12-15-2007, 03:37 PM
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Only sure way to to take the cover off and look. The ID tag under one of the cover bolts should tell you, if you know what code to look for, but that doesn't mean that someone didn't change things some time in the past.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #7 of (permalink) Old 12-15-2007, 04:13 PM
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You might want to invest in lubelocker reusable gaskets. Never scrape gasket and sealer again.
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post #8 of (permalink) Old 12-15-2007, 05:38 PM Thread Starter
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Have you guys heard of using just RTV instead of a gasket?

Carnell

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post #9 of (permalink) Old 12-15-2007, 07:21 PM
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Yep. It works well. Permatex makes several grades for different applications. Read the label to make sure it's the right stuff.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #10 of (permalink) Old 12-15-2007, 08:06 PM
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Which one would work best for a leaking tranny case?
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