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How To: Replace Front Wheel Bearing Assy on 2500HD/3500SRW (dually similiar):

165K views 557 replies 302 participants last post by  jd4230 
#1 · (Edited by Moderator)
Preface: If you are running oversized tires, high hp, or subjecting your truck to extreme shocks on the front, like drag racing or sled pulling, your front wheel bearings will not last much past the 36k mi warranty.

You can tell if the wheel bearing is shot by jacking the truck up til the wheel is off the ground, grabbing the top and bottom of the tire and try to pry it in and out. ANY movement is wear. A stocker will not move. Ours were worn to the point of more than 2" slop at the tire with 50,000mi on the truck. You can drive pretty far worn bearings without fear of the wheel departing the truck due to the captive design of the unit.

This is a sealed bearing assy that includes the hub, lug bolts, bearings, axle spline, wheel speed sensor, and cable. GM has recently updated the part number to #15225770 or AC Delco #FW289. Retail for the unit can be as high as $450 ea, to a low of $150 ea, so it pays to shop around.

Let's Begin/

What you will need:



You will need:

Floor jack
Jack stand
15mm socket and ratchet, wrench will work if you are strong.
21mm socket and BIG ASS breaker bar. Cutting torch will have better luck than a wrench on this *****.
36mm socket and breaker bar. Nut is actually 35.5mm, so a 1 3/8" socket can be beaten on it.
Sharp flat blade screwdriver.
Hammer.
Pliers.
Large C-Clamp.
Grease.
Loctite - Blue. Unless you're selling it, then use red. :D Blue allows for removal in the future, red is REALLY aggressive.

In picture, not absolutely necessary - impact wrench.

Not in picture, something a foot tall and will support 20lb, like a toolbox. And about 3 beers per side.

Step 1:



Jack side of truck up, and put a jackstand under it. Use frame rail.
Turn ignition to ON position and put in 4wd Hi, and set parking brake.
Remove Wheel.

Step 2:



Unplug the wheel sensor wire near the top of the shock. There are 4 push in wire retainers, you will not save them, so rip them out with pliers. You can cut off the wire if you think it will get in your way.

Step 3:



Use C-Clamp to compress the brake pistons so it will be easy to reinstall.


Step 4:



There are 2 loctited 21mm head bolts that hold the brake caliper frame to the axle support. THESE ARE TIGHT!!! Rotate the steering to get to them easier. Remove the bottom, then loosen the top one so you can remove it with your fingers. You will need to have something ready to support it when you remove the brake assy.

Step 5:



Pull the top bolt and set the brake assy on something that will not stress the brake line. You can destroy a brake line by hanging that much weight on it.

Step 6:



In this picture, the lug at 11 o'clock and 5 o'clock have a retaining washer that holds the disc on the hub for assembly purposes. Remove these by rotating them with a screwdriver, then pry them off. You do not need these, I suggest you throw them away. Once they are removed, you can pull the disc off the hub. If it does NOT come off easy? Torch and a mallet. Do not hit the rotor with a steel hammer or you can burr it up.


Step 7:





Pry the center dust cover off with a sharp flat blade screwdriver. Be fairly gentle as you will reuse this. It's not REALLY necessary, and serves no function whatsoever, but it looks prettier than the axle nut.


Step 8:



That nut in the center keeps the axle from wandering too deep into the differential. Other than that, it does nothing. It is not a load component. It measures 35.5mm, you can remove it with a 36mm socket and breaker bar or tap a 1 3/8" socket onto it. If the truck is in 4WD with the truck in park, it will not spin the hub. The nut is a locking nut, so it will be tight most the way off.

Step 9:



Once the nut is off, spray some WD40 into the center spline, then tap the axle into the hub gently until it stops. It will move about 1". This will make it easy to pull the hub off when it's time.

Step 10:





There are four 15mm bolts that hold the hub on. These are also pretty tight. If you turn the steering, it makes them easier to remove.


Step 11:



The hub should slip right out. You might have to tap the axle a bit more while holding the hub out from the base. Clean all mating surfaces, grease the axle spline and o-ring in base. Dust shield faces forward.

INSTALLATION







IMPORTANT TORQUE SPECS

Hub and Bearing Assembly to Steering Knuckle Bolts - 180 N·m / 133 lb ft
Axle Shaft Nut - 210 N·m / 155 lb ft
Caliper Mounting Bracket to Knuckle, Front - 300 N·m / 221 lb ft


Here's the new hub/bearing assy. There is some electrical tape on the wire holding them together, tear it off.

Line up the spline to the holes with the wire at TDC. If the bolt holes do not line up, you can either take the truck out of 4WD, or pull it off the spline and try to align it better. I suggest align it better. There is a lot of slop in the axle rotation, so you don't have to precisely get the right tooth on the spline for it line up. Screw the axle nut on by hand to hold it in place.

Use a few drops of Blue Loctite (yes I know it comes in a red bottle :D) on the 15mm bolts, and bolt the hub back down. Don't forget the dust shield. The wire goes UNDER the tab on the dust shield.

Tighten down the axle nut and washer on the axle. Tap the dust cover back on with the handle of the hammer.

Replace the rotor.

Hold the brake pads apart with your fingers and slide the brake assy onto the rotor. Use loctite and reinstall the two 21mm bolts. Do I know the torques? Uh... REAL tight? ;)

Snap the 4 wire holders into the same holes the old one came out of, and reconnect the connector near the shock.

Put wheel back on, lower truck..

IMPORTANT

Start engine and pump the brakes slowly several times. When you pushed the pistons back into the calipers, they are still sitting far away from the rotors and YOU WILL HAVE NO BRAKES.

Road test, and finish the last beer. :beerchug:
 

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#2 ·
Thanks McRat for fixing my truck :hug:
 
#3 ·
Thanks for the write-up and the pictures. One of the many reasons this site kicks a$$. :ro)
 
#6 ·
You beat me to the write up Pat. Now what am I going to do with these pictures I took?:p:

As usual, nice job.

I guess someone is going to have to park the Vette now and get use to picking on all the local kids with that big, heavy, slow truck.:lol:

I believe the axle nut torque to be 175lbs. Not sure about the others, perhaps someone with more knowledge than I will chime in.
 
#7 ·
Hub and Bearing Assembly to Steering Knuckle Bolts - 180 N·m / 133 lb ft
Axle Shaft Nut - 210 N·m / 155 lb ft
Caliper Mounting Bracket to Knuckle, Front - 300 N·m / 221 lb ft

Found these in various torque spec posts by GMCSID. These are for the 2500HD/3500 trucks. No wonder the caliper bracket bolts are such a PITA to get off, 221 lb ft :eek:

Other than 140 lb ft for the wheel lugs, I think this about covers all the bolts that you have to loosen and then tighten.

Post sources:
http://dieselplace.com/forum/showthread.php?t=2084&highlight=brake+caliper+torque


and

http://dieselplace.com/forum/showthread.php?t=1936

Thanks for the great write up Pat. Almost a carbon copy of what I did when I changed mine a few weeks back.
 
#9 ·
Thanks! I'll edit the tutorial.
 
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Reactions: Lilbuff63
#8 ·
nice job,thanks-
 
#10 ·
OPPSS!! Cannot edit the post to add the torques.

Silly rule. :(
 
#12 ·
Mine is slightly different in that the rotor comes off after the hub is off. (95 burb).

I have not been able to get the big nut to back out at all. Any suggestions?
 
#17 ·
I can't be of much help, I should have stated this was done on a 2004 3500SRW.

You should check the threads to insure they are RH threads. Some driveline parts on some vehicles are LH thread on one side and RH on the other.

All these fasteners in this how-to are all RH.
 
#16 ·
Still haven't got the nut off. If heat is used does the nut need to be replaced?
 
#18 ·
Make absolutely sure you are turning it the correct direction. It can be a left hand thread. Then apply heat in stages to the nut, trying it after each application. Should come loose long before it is red hot. Replace the nut if there is any discoloration.

If the spindle discolors at all, you will have to replace that also.
 
#19 ·
I checked the threads...they are normal. Lefty loosey.

I guess i'm just having a bad truck day. I was going to replace the front rotors and pads today but I wasn't even able to get the first nut off. Oh well...at least I didn't break anything. I'll just get a longer cheater bar and try it again next weekend.
 
#20 ·
On the 21mm bolts, I used a 24" long 1/2 drive breaker bar AND had to step on it. :eek:

Thank God I weigh too much!! :D
 
#21 ·
By the way...excellent post on how to change the hub!!
 
#23 ·
Excellent DIY article McRat. Very helpful and I will have to do mine soon because one of my studs is stripped from someone being too quick with an impact wrench on the lug nuts. :rolleyes:

PM me if you want me to edit the post and add torque specs.

Ben
 
#24 ·
Sure Ben!

Put this at the end:

"Torque Specs courtesy of Hookem:

###
###
###"


I would have done one for charger install, except:

Most the pictures did not come out.
Many things you cannot get a camera to.
I didn't know what the hell I was doing! :D

Usually for a how-to I need to do it once just to find out what works best, then a second time to do it right.

And I'm NOT doing a charger install again!!! :eek: :D
 
#26 ·
Hub and Bearing Assembly to Steering Knuckle Bolts - 180 N·m / 133 lb ft
Axle Shaft Nut - 210 N·m / 155 lb ft
Caliper Mounting Bracket to Knuckle, Front - 300 N·m / 221 lb ft
 
#27 ·
done! ;)
 
#28 ·
Nice Job!!!
 
#30 ·
Thanks McRat, I will be doing this tomorrow night. I have some Heavy duty wheel bearing grease and some disk brake grease. Not sure which one would be better. Probably go with the heavy duty. Hope I don't run into any problems.
 
#32 ·
That's the 21mm head bolts that hold the caliper frame to the suspension. Yes, they are WAY tighter than 80lbs.
 
#34 ·
job completed

Thanks McRat for the DIY write up. :thankyou2
The 21 MM fit so loose i ended up using a 13/16 and it fit perfectly. I wasn't having much luck breaking the 15mm bolts loose with my 1/2 breakover bar so i got out the 3/4...well i only had a 15mm in 1/2 so i used a 3/4 to 1/2 reducer...:badidea: broke that little jewel.
 
#38 ·
Thanks McRat for the DIY write up. :thankyou2
The 21 MM fit so loose i ended up using a 13/16 and it fit perfectly. I wasn't having much luck breaking the 15mm bolts loose with my 1/2 breakover bar so i got out the 3/4...well i only had a 15mm in 1/2 so i used a 3/4 to 1/2 reducer...:badidea: broke that little jewel.
I just did the passenger side. I had to use part of my floor jack handle as a cheater bar for my 1/2" breaker bar to get the 21mm bolts loose.
Did someone say these where on tight?
 
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