85w140 in rebuilt g/box HJ61

Submitted: Tuesday, Jul 26, 2005 at 12:18
ThreadID: 25061 Views:2959 Replies:4 FollowUps:2
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Hi there,

we just had the gearbox/transfer case on our HJ61 rebuilt in Kimberley. When we got home, I realized the mechanic filled them with 85w140 grade oil (presumably BP). We drove 5000km home to Wollongong, mainly in 5th gear. The gears now feel fine when they warm up, but when cold the 1st and 2nd are very, very stiff. I wonder if this wold be due to the high viscosity oil? Does this grade of oil give additional protection to the gears when they are still wearing in? In other words, should I change the oil to a lower grade, considering it is much colder here than in Kimberley, or should I keep it until the gears are worn in and just warm the oil up before driving off by running the engine in first gear with the transmission lever in neutral?

Joseph
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