RichP
NAXJA Forum User
- Location
- Effort, Pa
Motor oil does not have the shearing protection of gear oil, there's a reason is smells like sulfur.
What's wrong with changing out every 15 years?
I just changed mine ... it came out kind of looking like a semi-liquid tar. Better lubricating properties because it coats the gears better, right?
A no brainer. Change fluids regularly and use the mfg. recommended fluids.
If you don't, the odds are that "eventually" you'll be posting more questions here than answers.
A no brainer. Change fluids regularly and use the mfg. recommended fluids.
If you don't, the odds are that "eventually" you'll be posting more questions here than answers.
I dunno, gear oil seems to last a long time. I've seen countless Cherokees at the salvage yard with 200k+ miles that looked like the diff covers were never removed. On the other hand, my ZJ had the diff oil changed at 70k right after I bought it and at 140k, but then the spiders self destructed pulling out of the shopping mall. Gear oil still looked great except for the little bits of ground up spiders in it. I replaced it with a junkyard axle that looked like it had never been changed in 225k that looked great inside.
-Chris
(Yes, I broke a D35 while cruising the shopping mall.)
Was that a D35 or one of the hybrid D44's that ZJ's came with.
Hallo. That's strange, because in my service manual is mentioned, that each 40.000 km or 2 Years you have to change the Axle gear oil.
This manual is from the German Chrysler and has also control pages for stamps of the dealer. :dunno:
Maybe it changed from '92 to '01, or maybe the German's are just more fanatical in their maintenance. But I've never seen a normal (street driven only) vehicle have the differential go bad unless it ran out of oil. And only an occasional rear wheel bearing. Normal vehicles here NEVER get the differential oil changed (with the possible rare exception of positraction axles). Clearly, the rear axle should have vent hoses elevated to prevent intrusion of water for puddle forging.
In what I described the vent lets air OUT so water can get pulled in. Plug the vent and internal pressure would keep water out, not a good solution but about the best I can describe it.You still wouldn't want your vent under water either, but I see what you're saying. The vent probably couldn't take in enough air anyway unless it was bigger.
In what I described the vent lets air OUT so water can get pulled in. Plug the vent and internal pressure would keep water out, not a good solution but about the best I can describe it.
IMHO, when a hot axle gets chilled, the air inside shrinks in volume creating a vacuum. Without a vent to equalize the pressure, it would suck even more water past the axle seals. That's why we run vent tubes from dirt bike transmissions up as high as we can for water crossings.
wow, just wow. there definitely is a need to change the gear oil WAY before 195k miles. primarily to remove contaminates like very small metal shavings created through normal wear (especially break in) on the gears. i have seen some bearing races that were extremely pitted and one was worse than sandpaper caused by debris on the race. also oil breaks down over time and use and looses it lubricating properties.
what can i say about using USED MOTOR OIL in the diffs?!?!? that would be an idiotic move and then some. motor oil is designed to work in the engine- it has properties that make it best suited for that. gear oil is specially designed for gear applications and as properties specially suited for that purpose. but hey, does your daddy tell you to run old coolant in your trans or gas tank too? hey, i hear that dish water has great lubricating qualities so maybe you should use that in place of engine oil- it could also clean out some of that sludge...:skull1:
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