Paging @Piper One. I think he's gone through this.

 

I won't lie I was too lazy to search.

 

Fair enough, it might be a bit until he replies. I'm pretty sure he's on the road trucking along.

 

In no hurry, I'm just thinking about doing the brakes right now.
I did at least do my due diligence by trying to figure out wtf the overall difference was lol

 

There is an old post on this, look for "different rotors" it listed the 4.84 for the 9900 axle. On rockauto if you scroll down to OEM it lists the correct one.

 

@Blackmax65 I’m not sure where you are seeing “OEM” on RA.

What trucks have a 9900 axle?

 

AC delco

 

https://www.duramaxforum.com/threads/brake-service-questions.998963/?post_id=12197403#post-12197403

Here is a thread on the topic which is all fine and dandy except does that mean that axles could be different hub sizes? That seems awfully strange.

 

PM me the last 8 of your VIN and I'll look it up in the GM system. Won't be until the weekend at the earliest tho. Busy week.

 

Just did my rear's, 4.84 was correct for mine, 06 LBZ.

 

I’m pretty sure the Duramax-equipped trucks were the largest one of the choices period, besides the medium duty trucks. The 11.5 behind the Duramax was the largest rear offered in the 3/4-1ton trucks

 

@Blackmax65 They both are AC Delco

However the GM Genuine seems to be the larger of the two, which means I believe I need the larger of the two. Wonder why the GM Parts Store didn't show me that...

@Piper One PM sending when I get a chance to look at the VIN

 

If you have a Duramax it will be the 4.63 ones. Why they can’t make their search engines sort the smaller ones out when putting in the engine option is beyond me.

 

Oh boy two different replies!

 

I was looking on XDP extreme diesel website and the difference is between a SRW and DRW, so it is possible that the DRW has a larger hub to accommodate the load. I believe Nate is right, Piper will get ya the correct specs.

 

had to take back the 4.63's, didn't fit on mine.
here's a pic of my old rear rotor ...

 

My bad you need the 4.84 inch ones. I should have looked them up to verify the measurements. Like this is what you need. https://www.oreillyauto.com/detail/...es/brake-drums---rotors/7145c118aa8d/brakebest-select-brake-rotor/br20/56828rgs

 

Don't feel like making another thread for this. Raybestos is the OE for GM brakes correct? I am 99% positive I just want one person to tell me I am right.

 

AC Delco Silver and Gold are rebranded raybestos, yes.

GM Genuine is not the same as AC Delco variants or the corresponding raybestos, at least from having compared them side by side over the years. But there was no way to verify with the lack of any markings other than a part number on the box.

I'm in the market for fronts now, raybestos hybrid pads suck (no wonder they were on closeout), and the ac deco gold rotors look terrible after a year and 17k miles or so. Going with akeobono asp pads front and rear, trying to decide which rotors to try next. The rear brembo brand rotors however are holding up nicely.

 

@pl_silverado I will probably just go Raybestos all the way around pads and rotors. I am very confident that is what GM is using for their ACDelco gold line.

I probably will have no issue since I am in a no salt state.

 

Their gold line is crap whether branded ac delco or raybestos.

I'd rate power stop pads better than raybestos, just my experience. Their geomet coated rotors were also nicer than the delcos. But as far as pads go, I only buy Akebonos anymore.


Beings my rears are ok, i might bite the bullet and order the gm genuine front rotors at $ 140 a piece and install them with the akebono pads. I'm tired of being the test dummy for cheap parts.

 

@pl_silverado Are the gold lines crap because of the coating or because they warp easy?

 

Warp easy.

I might give those black bendix fleet metlok rotors a try. Always had decent luck with bendix stuff on the medium and heavy duty trucks. But i swear by akebono pads.

 

Or break down and spend the $5k on wilwoods front and rear.

 

No go on the WW, have too many vehicles in line for them first…

SSBC offers a bigger caliper for the rear, a three piston.

 

My buddy has them on his truck, front and rear if i recall correctly and raves about them. IDK, if spending that much i'd just pony up for the wilwoods. I did an 8x180 conversion on my 3/4 ton burb, and the larger front brakes helped that thing immensely. That was $5k in parts itself using all new gm genuine parts. So wilwoods aren't terribly priced imo.

Ordered front Brembo rotors to match the rears, will throw it all together with new akebono pads and report back in a week or two.

 

@pl_silverado I wish 01-10 pickups could convert to another bolt pattern lol

I didn't see the fronts. I swear they used to offer them but I didn't see them last I looked.

 

They definitely used to offer them, as I’ve physically seen them with my own eyes. Not sure when they disappeared off their site.

You can convert to 8x180 using spindles/hubs/half shafts off a 2019 suburban 3500. But it gets expensive. Then you have to address the tone wheel tooth count via tuning, but I don’t see the options to adjust front and rears individually on the lbz / lmm like I was able to on the e38 ecm with the 6.0.

It might be doable with the trucks that only have front abs, but my lmm with the 4 wheel abs would prove challenging. I may attempt it one day just to see if I can pull it off. But the cost isn’t far off just buying the wilwood kits front and rear 🤷‍♂️

 

@pl_silverado Factory retrofits and swaps just get me going. If you know of a writeup for that swap I would love to read it. I will do some searching.

But why does it matter adjusting it individually?

 

Sent you a pm.