Quick transfer case question

[Parksy]

Hi all

Do the internals of the transfer case rotate while in 2wd? I am just wondering how the rear driveshaft bearing gets any lubrication if only driven in 2wd.


Andy

[Rustyboner81]

Hmmm dunno.
It would have to be connected wouldnt it, just the gears would free spin in neutral untill 4wd was selected???

Good question

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[krbrooking]

As far as I understand it. It would be the same as the gearbox when in neutral the shaft would spin which in turn would lubricate everything, just the gears would not be engaged. Could be wrong though.


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[BigRAWesty]

https://www.youtube.com/watch?v=K1qj...e_gdata_player

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[Parksy]

Thanks guys. I have a good understanding of how it works now westy , but doesn't really explain how it's lubed. Here's a vid of a gu box that's been opened up,
Unfortunately he only runs it in 4wd, so its hard to see how it would get lubed in 2wd. I'm assuming the chain is used to splash the lube around being the front wheel driveshaft gear sits in the oil bath.
http://youtu.be/ReqaGtW0SSE

[taslucas]

It's often said to put a vehicle into 4wd occasionaly to lubricate everything

[Parksy]

I have heard that taslucus and it is good practice to regularly run it in 4wd as a preventative, but I do find it hard to believe that something as vital as an output bearing would rely on this, especially if doing alot of highway driving. 10 mins of highway driving and the bearing would be red hot and dry as a bone.

[taslucas]

It obviously doesn't hurt it, as it's not too common for the bearing to go

[Parksy]

That's true. I've heard that ATF is recommended if you have auto locking hubs. Apparently heavier fluids can cause the front driveshaft to spin and inadvertently lock the hubs.

[mudnut]

Yeah, the transfer case in a 94 is recommended to run ATF. I replaced the fluid as the old stuff was totally had it and the transfer case was making clanging noises when pulling up in low gears. Two mechanics told me it was a stuffed diff, which I replaced. The clanging has diminished, with the new fluid, but is still there, so I was thinking of changing to a light gear box oil. I only have manual hubs, so I will have to live with the front diff rotating until the transfer case warms and thins the oil.