Service 4wd Warning

[Z_71_steve]

the other day i was out and i was in some mudd so i threw it in 4wd, she ran fine.. no odd or different noises... ran like a champ.. but then when i flipped it back into 2wd the service 4wd light came on... now when i got down underneath the truck i saw a little fluid dripping from the transfer case? how do i go about adding more fluid? sorry when it comes to the 4wd system on this truck i'll admit i'm quite the newb...

 

thanks for your help in advance..

 

steve

[jrrod2004]

Add fluid at the filler plug hole

[jrrod2004]

Service Information

2004 Chevrolet Chevy K Silverado - 4WD | Chevrolet Silverado Owner Manual | Document ID: 1228450 Four-Wheel Drive Lubricant checks in this section also apply to these vehicles. There are two additional systems that need lubrication.

 

Transfer Case

 

When to Check Lubricant

It is not necessary to regularly check transfer case fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired.

 

 

How to Check Lubricant

Manual Transfer Case

 

 

Automatic Transfer Case

 

 

To get an accurate reading, the vehicle should be on a level surface.

 

If the level is below the bottom of the filler plug hole, located on the transfer case, you will need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. Use care not to overtighten the plug.

 

 

When to Change Lubricant

Refer to the Maintenance Schedule to determine how often to change the lubricant. See Scheduled Maintenance .

 

 

What to Use

Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants .

 

© 2008 General Motors Corporation. All rights reserved.

[jrrod2004]

This may have happened to your transfer case:

 

 

 

 

Service Information

2004 Chevrolet Chevy K Silverado - 4WD | Sierra, Silverado (VIN C/K) Service Manual | Document ID: 1962218 #PIP4118: Improved Oil Fluid Wear Pump Clip - keywords 136 149 246 246EAU 261 263 263EAU housing leak case transfer transfercase - (Apr 17, 2007)

Subject:Improved Oil, Fluid Wear Pump Clip

 

 

Models:1998-2007 Light Duty Trucks and Utilities

 

 

Equipped with New Venture Gear Transfer Cases RPO NP1, NP2, NP3, NP4, NP8

 

 

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern:

Oil pump wear clip P/N 12470559 is broken or out of position. This may cause the pump to wear a pin hole in the transfer case rear half. If the wear is severe the transfer case may be damaged due to lack of lubrication. The clip may fatigue and break. The clip may become loose and shift out of position.

 

Recommendation/Instructions:

A new clip design has been released. P/N 89059653 is available for both production and service. This new part totally cancels and supersedes the former P/N 12470559. Only the new clip will be available.

 

This new oil pump wear clip should be used whenever a transfer case is opened for any type of internal service. See photo. GMSPO currently has inventory of the new part.

 

 

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

 

 

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

 

 

© 2008 General Motors Corporation. All rights reserved.

[jrrod2004]

hope that gives you a better idea

[Hammer2785]

If you have the autotrac 4wd it could also be the switch on the dash. It's about $40 if I remember right. Solved my issues.

[Z_71_steve]

thanks a ton mike! i appreciate all your help! i'm gonna take it in and see bout gettin it taken care of... but i'll definitly be adding fluid tomorrow!

 

thanks again for everybodys help!

 

steve