I'm with Pitbull on this. Your axle's life stages are:
1) it's fine: clean around the felt sweeper, clear diff fluid, no noise.
2) some 'gunk' around the lower knuckle bolts and/or a dark color to your diff fluid, no noise. (happens maybe around 100k, on average?)
3) your knuckle is dripping an oil/grease mixture, your diff fluid looks like liquid grease, and/or you hear a faint click when you turn sharply.
4) your knuckle is leaking oil like a sieve, your diff fluid is thick and might have very little oil remaining, and/or you hear loud pops.
5) it breaks.
Various people have opinions on what stage you should service your front axle. It depends on your preventative maintenance philosophy: how willing you are to risk breakage and serious expense, vs. the 'unnecessary' lifetime time/expense of 'premature' service. Cdan, B and others would maybe suggest service between 1 and 2, Pitbull is maybe at 3.
I just finished doing a complete front axle service (including replacing hub and wheel bearings) because it was in stage 2, and I do NOT recommend you do this unless you are a) single, b) you can't find someone you trust to do it, and c) you think your personal time of roughly two whole days is worth less than ~ $500 (8 hrs book x $65/hr shop rate).
Next time, I'm probably taking it in to a trusted mechanic. I'm a wuss, so sue me. For various reasons (including doing the work on a near-zero frigid weekend in an unheated garage, finding bad wheel bearings while in there, and not finding new ones on a Sunday), the whole job took about 20 hours, and I don't feel like I really learned very much. The solvents to clean the birf are nasty and I don't know what to do with them, I have oil stains on the floor, grease stains on my clothes, shoes, kitchen floor, I still have a scary solvent smell in the garage, I probably killed my one remaining brain cell from the unventilated garage (too cold to do outside) and so destroyed my ability to have more children.
Kenton
[quote author=Hltoppr link=board=2;threadid=10391;start=msg92947#msg92947 date=1074644838]
I'm sure there are plenty of people in the Texas area who would be willing to help you out. Many of us will hook up with others just to perform this service, which, while being messy, isn't that complicated.
These items DO need service, I think the standard mileage here is at 60K intervals. You can wait until they start to click and pop, but be prepared for a hefty parts bill if you have to get new ones. For me, it's easier to keep up with the required maintenance then get stuck SOL.
Read through the numerous posts on this subject and I'm sure if someone is close to Abilene, they may be able to help you out. Personally, with 99K I wouldn't put it off too long.
-H-
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