Hub Bearing Going Bad

NV5600 · March 7, 2011

It seems way too common for these front hub bearings to go bad. I am going to have to change one on my 2005 Z71 with only 45K miles. I have a new Timken unit ready to go and have the old bolts soaking in PB Blaster. I have searched all over and I cannot find the torque specs for my year. I found numbers for 2003 which are probably the same but I'd like some reassurance. I need the axle nut torque and the torque for the three mounting bolts. I guess I'll need caliper bracket bolt torque too.

Thanks in advance!

Egghaus · March 8, 2011

I think the axle nut torque is 180 ft-lb, not sure on the other two though.

the hammer · March 8, 2011

I believe the hub-to-knuckle bolt torque is 133 ft-lbs.

Brake caliper bolts are 125 ft-lbs.

CV Axle Nut torque is 155 ft-lbs.

These values i got from my BDS lift kit installation instructions. Double check for yourself here (BDS Lift Kit Install Sheet. Go to page 14.

Hope this helps!

grimmysnr · March 8, 2011

Don't know if this is legal or not but here is the installation portion of that task in PDF format. I selected it based on your year and model but assumed it was a 4wd. Lemme know if this is accurate. I can get the full task for you but I wont be able to upload it here with the attachment size limitation. If you would like you can send me a message or something and i can look it up for you.

good Luck.

docSyskey_875921_pubCellSys.pdf

NV5600 · March 8, 2011

Don't know if this is legal or not but here is the installation portion of that task in PDF format. I selected it based on your year and model but assumed it was a 4wd. Lemme know if this is accurate. I can get the full task for you but I wont be able to upload it here with the attachment size limitation. If you would like you can send me a message or something and i can look it up for you.

good Luck.

Thanks for the replies everybody. Yes, I found a couple of big .pdfs while looking around They had information for thousands of different vehicles. I finally ended up subscribing to Chilton's since I plan to keep the truck. Maybe I can return the favor for ya'll.

asc08 · March 8, 2011

I'm sure you have seen numerous posts on this, but from what I gathered, many repeat, early failures are attributed to not properly torquing the axle nut on the 4x4 models. Otherwise, it appears to be pretty straight forward.

I don't have the 4x4 model, but was doing a lot of reading in preparation for a wheel speed sensor / possible hub replacement.

Good luck.

newdude · March 8, 2011

Per GM the torque spec for the cv nut is 177ft.lbs.

If I remember right, around 02-03 GM had updated it from 155ft.lbs due to premature failures.

the hammer · March 8, 2011

Per GM the torque spec for the cv nut is 177ft.lbs.

If I remember right, around 02-03 GM had updated it from 155ft.lbs due to premature failures.

I wish whatever it was they would have fixed it cause I had to replace mine at 70k and its an 06. If it was just bearings I wouldn't complain but having to buy the whole dang hub sucked.

Georgebaumann · March 8, 2011

yah both of mine just went at 80k and one was so rusted on there i cant get the 3 bolts off ven after i soaked it for 2 days with pb blaster. now i stripped two of the bolts and am going to shop to get in professionally installed