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Old 01-23-2014, 01:42 PM
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Trailblazer Front wheel bearings

I've got a 2006 Chevy Trailblazer 4X4 with 81,000 miles and have gone through 7 front wheel bearings. I just put in number 8 and 9 today. I never 4 wheel with it. Sometimes I might go into 4 lo to get out of my snow covered drive. In the past I used Advance Auto replacements. Today I put in a set of Moog bearings from Summit Racing. I remove the ABS Sensor and made up a grease fitting to go in the hole. It takes 40 to 45 good shots (no air) from a hand held canister type grease gun before grease comes out of the seal. I remove the grease fitting and put the sensor back in and then install in vehicle. I've done this with the Advance Auto and the Moog replacements. When I add the grease I get 10 - 12,000 miles out of the Advance Auto bearing. Without adding the grease about 7-8000 miles. I'll see how the Moog units do after 15,000 miles. I followed all the torque specs to the letter. The front end is in line, tires are well balanced and wearing very straight, and the wheels and tires are stock. I'm hoping the cheaper replacements don't have the desired heat treatment or hardening and the Moog units do and they will last. We'll see. Have any of you run into this? What's your thoughts?

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Old 01-23-2014, 02:12 PM
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ok, did you buy it new. a few things come to mind over tightened or maybe a turn 2 loose. also the spindle may be bent. the rim maybe bent. are you using high temperature disc brake plastilube # 3 wheel bearing grease. if you are just using the same grease for u-joints and other suspension parts it will fail. also the wheel bearing needs to be "packed" properly before it is installed.


Last edited by killeratrod; 01-23-2014 at 02:17 PM.
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Old 01-23-2014, 02:21 PM
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Are you replacing the entire assembly or just the unit bearing?
I've never heard of trying to lube a hub through the ABS provision. I would guess that the cheap bearings are junk, which is something I have experienced myself.
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Old 01-23-2014, 02:38 PM
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These are sealed bearing assemblies with 2 bearings and the ABS unit between the bearings. You can't take them apart other than with a cut off wheel. I wish they were like my '71 Nova where you can take them apart, wash them out, inspect, repack, and reinstall.
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Old 01-23-2014, 02:50 PM
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Torque on the hub nut is very critical. 103 ft-lbs, no more and no less.
Other than that, I would be blaming cheap bearings.
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