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1999 Blazer. Thing's to check. 4x4 problem. There's an actuator pump under your battery plate. Make sure its in good shape and its working proper. Next check the cable that runs from the pump to the front transfer case. Then check the actuator switch on the front transfer case. Then check the vacuum lines from the front transfer case to the rear transfer case, that should be right under the drivers side door. There's also a actuator switch on the rear transfer case witch two vacuum lines run out of. Check them also, and last check your fluid level in your transfer case. Start from the beginning to the end. Don't forget to use your 4x4 every know and then to keep it up to power. Its not like the good old days. Where a pull of the lever on the floor engaged the 4x4. I hope this helps.
Tires must be the same height, you may have to walk around it and measure the height of all 4 tires and they need the same air pressure . Sometimes the front tires will squat down from sitting even if they are all the same brand. The weight of the motor can cause this. A person in that Case can switch the back tires to the front and see what happens.
Sound crazy, but alot recommendations say thet when you pass from Hi to Lo must insure that you have foot on the brake pedal.
Loss of vacuum engages the front hubs; other for no 4 wheel drive and no indicator light. Go home pulled all the fuses
that had to do with the 4 wheel drive system, put them back in and 4
wheel seems to work fine now. And no there were no blown fuses.
I recently had same case and it was a
bad electric motor on the transfer case (31000 miles). The 4x4 light
wouldn't even light up or engage so I would lean towards it being
something different on your end.Also, could be the actuator pin or w/e the little plastic piece is that
engages the 4LO might be broke, or maybe a couple of other things.
Try moving the tire to a different position and see if the sound stays with the tire or stays in the right front. Does it do it when braking, accelerating, driving straight all the time? Also - if you get on a long straight stretch of road with no traffic - switch it to neutral and turn the engine off - REMEMBER - you will lose power steering and brakes with the engine off.
I think there is another other sticker in the back cover of the spire tire cover in the trunk, but you can go by the the tire pressure label on the tire it self and run the rear tire pressure 4 pounds less then the front. The front always have more since that is where the engine is and the rear has no weight so a softer tire will keep the rear end from hopping around bumpy corners. I believe the proper tire pressure on the Z24 if it's the correct tire is 42 lbs cold front and 38 lbs cold rear if you like the performance feel and if you like the softer feel, then drop it by 6 lbs both front and rear. Good luck and hope this helps.