1987 Chev S-10 Blazer Other - Drive Train & Driveline

Question: I have had my Blazer for about 2 years and it has always made a noise in 4 wheel drive. This only occurs in 4 wheel drive. It has never been a problem. Lately, when I put it back in 2 wheel drive the light that indicates that the front differential is still engaged does not go out and I can still hear the noise but not as loud. That tells me that maybe the 4 wheel drive is not disengaging completely. The rear tires are the only ones turning, as should be. I have adjusted the shift linkage for the 4 wheel drive and it is all working properly. It shifts smoothly from 4 to 2 wheel drive so I assume the transfer case is working fine also. I also checked the wiring on the shift lever that controls the lights and they are fine. The wierd thing, at least to me, is that if I let it sit for a couple of hours and then restart it the light is off and it is back in 2 wheel drive. Is there any electrical or vacuum mechanism that could cause this? I am lost. I would appreciate any help. Thanks.

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Technican: I am certain you do not want to hear this, but, REBUILD TIME! The noise is from a part of the assembly that is worn. The disconnect is sluggish and is not reacting as it should. That assembnly needs to be taken apart, cleaned, defective parts replaced, and reassembled with a good grease that is designed for 4 wheel drive service. Do not scrimp to save a penny or two. Such stinginess could have you back in the repair shop sooner, at a greater expense than the better grade of grease cost would cost.

Owner: When you say it needs rebuilding, what is it that needs rebuilding? The transfer case?

Technican: Yes, transfer case. The axles will also need to be looked at. There should not be any noticeable noise. Since there is, there is a mechanical problem and it needs to be fixed. The light problem indicates a switch is not operating properly. This is controlled, usually, by a mechanical device. This device, or the switch itself, is not operating as it should.

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