Center/carrier bearing orientation - 76 C20 suburban

TheC5Surgeon · Thursday at 9:39 PM

Heard a clinking noise while running around testing the new build/motor. I think the culprit is the dust guard moving around that I put on the new carrier bearing I installed. Not sure If I was supposed to include that but any ideas on how its supposed to be installed? I could maybe epoxy it against the bearing so it stays in place? Also, I noticed after taking these pictures that my bearing is installed in the up orientation rather than upside down like i see in most pictures. Is that a suburban thing or did I screw this up? Pretty sure I installed it the same as I took it out. Plus I believe there is a section of x pipe right underneath that which would make it impossible to install the other way.

ali_c20 · Friday at 3:03 AM

Remove the dust cover, and add some grease to protect the bearing.
Everything you put on the driveshaft could cause an imbalance.
The rear dust cover is pressed on, not super tight but it's not coming loose normally. The front one is between the bearing and the thick part of the driveshaft.

Is this bearing the right part?

Bearing kits contain sometimes more dust covers as they are used on multiple vehicles and not all of them should be used.
There are directional and non directional bearings.
There are bearings that don't use a separate dust cover.

https://www.rockauto.com/en/catalog...rain,drive+shaft+center+support+bearing,12743

I think I raised more questions than I've answered....

TheC5Surgeon · Friday at 5:35 PM

It should be the right one. I initially bought a unit that was to small and had to order another from rock auto. I will have to take the drive shaft out and press it off if I remember correctly.
It doesnt look upside down though correct?

TheC5Surgeon · Friday at 5:36 PM

Those dust covers just move completely freely and do not seem to press on. At speed over 20-30 they make a loud clinking sound

PrairieDrifter · Friday at 7:03 PM

TheC5Surgeon said:
Those dust covers just move completely freely and do not seem to press on. At speed over 20-30 they make a loud clinking sound

That's not how it should be. That would wear through stuff pretty fast and the noise.

TheC5Surgeon · Friday at 7:55 PM

Ok well what about it being upside down or not? Most of the pictures ive seen are with it installed a different way. Just want to make sure this doesnt fall apart after a few more miles on the road.
Guess I will take it apart to get the dust cover right at the least

ali_c20 · Friday at 11:47 PM

TheC5Surgeon said:
Ok well what about it being upside down or not? Most of the pictures ive seen are with it installed a different way. Just want to make sure this doesnt fall apart after a few more miles on the road.
Guess I will take it apart to get the dust cover right at the least

It`s mounted in the right direction.

HotWheelsBurban · Saturday at 12:07 AM

The way I remember the carrier bearing being on the '84 and the '90 Burbs, the dust cover was a metal part that threads onto the external threads on the driveshaft. The zerk/grease fitting is on that shaft, and that was something I hit every grease job.

TheC5Surgeon · Saturday at 4:11 PM

HotWheelsBurban said:
The way I remember the carrier bearing being on the '84 and the '90 Burbs, the dust cover was a metal part that threads onto the external threads on the driveshaft. The zerk/grease fitting is on that shaft, and that was something I hit every grease job.

hmm it doesn't seem like those metal fittings press on or thread on to any part of the drive shaft or center bearing. I will have to take the drive shaft off to investigate further

HotWheelsBurban · Saturday at 6:52 PM

TheC5Surgeon said:
hmm it doesn't seem like those metal fittings press on or thread on to any part of the drive shaft or center bearing. I will have to take the drive shaft off to investigate further

It looked like a metal jar lid IIRC....both Burbs are long gone so IDK what exactly it looks like, or have measurements.

TheC5Surgeon · Saturday at 8:29 PM

HotWheelsBurban said:
It looked like a metal jar lid IIRC....both Burbs are long gone so IDK what exactly it looks like, or have measurements.

ok I will post some more pics after taking it off and report back

TheC5Surgeon · 2025-04-20T14:00:39-0400

pressed off the bearing today. Here is a pic. None of those dust covers fit snuggly into the bearing and are free to move around the driveshaft. Any idea how these are supposed to be installed?

HotWheelsBurban · 2025-04-20T14:05:11-0400

TheC5Surgeon said:
pressed off the bearing today. Here is a pic. None of those dust covers fit snuggly into the bearing and are free to move around the driveshaft. Any idea how these are supposed to be installed?

WOW, that doesn't look familiar. I haven't had to service this on my Crew Cab so not sure if it is different style on the OBS trucks.

TheC5Surgeon · 2025-04-20T14:32:08-0400

Also does anyone know where you can get the threaded dust cap that goes on the driveshaft right behind this bearing?

HotWheelsBurban · 2025-04-20T23:20:03-0400

TheC5Surgeon said:
Also does anyone know where you can get the threaded dust cap that goes on the driveshaft right behind this bearing?

That's the part I was thinking of. I looked at my OBS Crew Cab and it has that part too. Looks a little bit different but considering it's a newer generation and twenty years newer... this is to be expected. Still not sure about those other covers/washers. I don't recall having those on our trucks. I do remember how we had to do the '84 twice in a week because it was installed backwards the first time (we had not done this before and if there were instructions included with the part, they were unclear). So once we learned which way was correct, Dad ground an arrow into the base so we wouldn't make that mistake again.

Center/carrier bearing orientation - 76 C20 suburban

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