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Towing vehicle(tow truck) With single speed transfer case

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2 hours ago, Brizzo Jenkins said:

my only concern at this point would be If the rear differential and bearings are receiving proper lubrication.  I would think that it would not be an issue, but GM does some weird stuff in their engineering department. I have not had the chance to study if the lubrication system to those rear parts are independent, or pump driven. Maybe someone with further knowledge can advise us?

If the wheels are turning the internals are getting lubricated.  The ring gear picks up the fluid  as it spins the fluid goes where it needs to as long as the level is correct.

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