Senior Member
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Join Date: Dec 2015
Location: Colorado
Posts: 1,181
Real Name: Ron
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Senior Member
Join Date: Dec 2015
Location: Colorado
Posts: 1,181
Real Name: Ron
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Not unusual. In the absence of overheating or contamination, gear oil lasts indefinitely. Unlike engine oil, there are no combustion products to contaminate the oil, nor is the gear oil normally subjected to a lot of heat.
Which is not to say you shouldn't change it every 50,000 miles or so - it's cheap insurance to do so. But it's normal for it to look just fine.
I pulled apart the transfer case in my '94 two years ago to make some mods. At 215,000 miles and 23 years of age it looked literally brand new inside. No staining, no sludge in the bottom, nothing. I had changed the oil a couple of times over the years, but I'm just using this as an example that normally, not much goes wrong in a gear box as long as it stays sealed up and isn't abused.
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2006 Sport Edition, V8, 206K miles, 2.5/1.5" OME lift, SPC adjustable UCA's, 255/75/17 BFG KO2's load range C @ 40psi. Regeared diffs to 4.30, with TrueTrac in rear.
1994 SR5, V6, 5-spd, Aussie locker front, Aisin manual hubs, Truetrac rear, 33/10.50/15 BFG KO's, stock suspension, OBA (Viair 400C), Front Range Offroad twin stick, 225K miles. Dual 2.28 transfer cases, for a 90:1 crawl ratio.
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