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I own a 2002 Yukon with 250K I noticed that when I switch…

Hello, I own a 2002...
Hello, I own a 2002 Yukon with 250K I noticed that when I switch from*****(2-HI) to (Auto 4WD) it automatically goes into 4WD and stays there on 4wd no different then switching to 4 HI? my question is, if it is on Auto 4WD should it only engage when necessary and not stay on 4WD constantly? Any help would be appreciated
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Answered in 1 minute by:
1/24/2018
Gary
Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 17,903
Experience: GCM master tech over 25 years
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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the clutches in the transfercase should slip so to say on purpose in auto to apply power when needed it still will turn the drive shaft and lock the front diff axle

usually what you are experiencing is dirty transfercase fluid which will keep the clutches from slipping in and out as they should and a transmission fluid change with the correct fluid will do the trick

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Customer reply replied 4 months ago
you think that a transfer case service should take care of it? it also makes quite a bit of noise when in 4WD. will the service this help as well?

it will if the fluid is very dirty or low

keep in mind if the fluid is very low changing it might NOT correct all the noise you are hearing as it was run with low fluid in it and there could be some bearing damage causing this noise

but a service usually helps alot

please dont forget to rate me here at Justanswer

you can always get me back for FREE for any follow up any time with this question even after you rate me here at Justanswer

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Gary
Gary, ASE Certified Technician
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Customer reply replied 4 months ago
Thank you! I will start with that first and see how it goes.

sounds good

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