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It is a fairly well known issue with the t-case and auto hubs using standard 80W90 gear oil. The gear oil caused enough drag to turn the drive shaft and to engage the auto hubs. There are few solutions.
1) replace auto hubs with manual hubs
2) mod auto hubs to only be manual hubs (there are a couple threads on this in that other Patrol forum)
patrol4x4.com/forum/nissan-patrol-gu-gr-10/hubs-converting-autos-manual-6524/
3) put in a synthetic oil - like Redline MTL
4) or put in ATF (this is what Nissan decided as the solution with post 91 models)
In my auto, I run the same ATF in the Tcase and Tranny. On my 5 spd, I run Redline in both the Tcase and Tranny.
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Last edited by NissanGQ4.2; 8th May 2012 at 10:29 PM.