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Old 02-19-2010, 09:01 PM   #1
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Puzzling FSM/owners manual maintenance schedule

I have both the factory owner's manual and the factory service manual for the '99 TJ. In the recommended maintenance schedule "A" (normal duty) there is no mention of changing the differential fluid for the life of the vehicle. In schedule "B" (towing, offroad, desert, etc. operation) it says to change the diff fluid front and rear every 12,000 miles. I thought this was kind of odd. My common sense tells me to change it, but a knowledgeable(?) friend says most vehicles don't need the diff fluid changed. My TJ just turned 67,000 miles so I doubt it's been changed. I bought it 4 months ago. It hasn't been offroad much except by me and nothing hardcore. Any Thoughts?

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Old 02-19-2010, 09:06 PM   #2
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If you are wheeling offroad in deep water especially you might be changing your fluids out frequently....even if you just drive on the street I think 25,000 miles is a reasonable interval for diff fluids. Since you just got it, I would change out and flush when possible all the fluids and inspect thoroughly

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Old 02-20-2010, 01:20 AM   #3
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I bought my 2000 last March with 81000 miles. When I changed the fluid in both differentials I found out it had been done previously. Changing both gives you the opportunity to inspect your gears and learn how the previous owner handled maintenance.

Then carried it one step further and changed the transmission fluid. Again found out it had been changed before. Lets me believe I got my moneys worth.
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Old 02-20-2010, 07:12 AM   #4
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25k on the jeep never changed diff fluid. Have a ram 2500 van 1997, changed diff at 125,000. fluid came out like it was new. I was wondering the same about that maint. schd. manual. Also I have always used a gasket for any device holding fluids. All the van had was silicone from the factory. I bought a gasket and also used form-a-gasket sealer. I have read on here RTV is all you need. Has anybobdy experienced a leak using this method? It seems like alot of work to end up with a leak. Any who I always wondered about that schedule and after seeing my vans 125,000 fluid I'm debating the whether to do it.
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Old 02-20-2010, 07:18 AM   #5
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Quote:
Originally Posted by scavanau View Post
I bought my 2000 last March with 81000 miles. When I changed the fluid in both differentials I found out it had been done previously. Changing both gives you the opportunity to inspect your gears and learn how the previous owner handled maintenance.

Then carried it one step further and changed the transmission fluid. Again found out it had been changed before. Lets me believe I got my moneys worth.
What evidence was there showing it was changed? Bought mine with 4000 miles so I don't think it was ever done. Topped off the manual fluid ,it was 1/2 quart low. But I couldn't tell if it was changed or not.
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Old 02-20-2010, 07:20 AM   #6
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I have always used RTV with no leaks. It is a lot easier to use than the black gasket garbage they sell.
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Old 02-20-2010, 07:26 AM   #7
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One other Item, rear diff has rubber plug just like my van. It appears at little higher than the three o'clock position which seems good for fluid level. However front diff has threaded plug approx 4o'clock position. It doesn't seem like you can get enough fluid in before it starts running out.
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Old 02-20-2010, 07:35 AM   #8
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Quote:
Originally Posted by chucky cheese View Post
25k on the jeep never changed diff fluid. Have a ram 2500 van 1997, changed diff at 125,000. fluid came out like it was new. I was wondering the same about that maint. schd. manual. Also I have always used a gasket for any device holding fluids. All the van had was silicone from the factory. I bought a gasket and also used form-a-gasket sealer. I have read on here RTV is all you need. Has anybobdy experienced a leak using this method? It seems like alot of work to end up with a leak. Any who I always wondered about that schedule and after seeing my vans 125,000 fluid I'm debating the whether to do it.
I wouldn't use a gasket AND an RTV gasket...use one or the other. If done correctly the RTV gasket will give you no leaks or other problems. I don't know what gaskets you have but I have heard of LubeLocker gaskets and they get much praise.
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Old 02-20-2010, 09:06 AM   #9
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I changed out my diffs, tranny and transfer case oils at 24k miles. Seemed like a good place to do it.
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Old 02-20-2010, 04:23 PM   #10
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12K ON THE DIFFS
30K ON THE TRANS
5K ON THE ENGINE
Check regularly. I plan on keeping mine forever.
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Old 02-21-2010, 01:09 AM   #11
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What evidence was there showing it was changed?
Based upon my best assumption. Appeared to be a hurried mechanic job.

Excessive amounts of RTV sticking out around diff. cover bolt heads, Royale Purple came out of diff. & trans., and use of teflon tape for transmission drain plug (teflon tape was shodily overwrapped).
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Old 02-21-2010, 05:30 AM   #12
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Quote:
Originally Posted by scavanau View Post
Based upon my best assumption. Appeared to be a hurried mechanic job.

Excessive amounts of RTV sticking out around diff. cover bolt heads, Royale Purple came out of diff. & trans., and use of teflon tape for transmission drain plug (teflon tape was shodily overwrapped).
Thanks, wanted to know what to look for

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Titanic's Captain Smith "What icebergs? Full speed ahead!"
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