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Four wheel drive system not working properly

Tiny
A.BENNETT
  • MEMBER
  • 1999 GMC SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 206,311 MILES
Has new transfer case motor and new electric switch.
Will automatically switch from 4hi to 4lo or auto4wheel.
You think it's in 2hi or 4hi then when you start driving it will automatically do whatever it wants. Sometimes it locks in 4lo and has to be put in neutral or a gear to be taken out. The 4lo light will also flash when it's in 2hi or 4 hi.
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Saturday, March 12th, 2022 AT 3:14 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The first thing I would do is check the oil level in the case. It must be full for it to work correctly.

What kind of oil did you use when you changed it out? That is critical.

NVG 246-NP8. Automatic Transfer Case Fluid GM Part No. 12378508

Roy
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Sunday, March 13th, 2022 AT 1:54 AM
Tiny
A.BENNETT
  • MEMBER
  • 2 POSTS
Was not changed out yet, topped off with transmission fluid.
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Sunday, March 13th, 2022 AT 3:34 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Change it and use the exact fluid I posted. It is critical to use the correct fluid.

Roy
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Monday, March 14th, 2022 AT 4:34 AM

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