The gear boxes breath through the shifter or some have a separate breather on top. Get in the right wind condition and gear oil fumes get sucked up into the cab, happens on my '85. I find Redline synthetic gear oil smells a whole lot less than dinosaur squeezins. But for a total fix, run breather lines from each gear box up to the firewall. That will be what I am going to do:

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r.c.brown@ieee.org
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Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code