help confirm axle size and gearing options

[Gagliano7]

THey probably have aam rears leftover so the want to use them up. The rears will probably be all gm by next year model.

[FL335i]

Might have something to do with all the K2 shakerado claim....  I know I threw Yukon shafts at my axle and fought a leaking axle seal for years. And my R&P Backlash was way too high for me.  Overall a crappy quality axle. I'm glad to see something change.  I noticed something was different with the rear axle when watching the new T1 reviews and they were putting the cameras on the road and driving over them. I noticed a flange on the new axle, similar to a toyota. I just hope to god the T1 does not shake!

[asalinasz39]

I have noticed the RST z71 at my local dealer have 5.3L and 3.42 gear ratio. But my at4 came with 3.23 5.3L...so iam sticking to 305 65 r18 (33.5x12.5) when its time for new rubber that is.


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[Whiz]

Had my 2019 Silverado Dual Cab fail in the brakes department.  Actually dash lit up like a Xmas tree with errors.  Took damned near two feet to get it stopped.  Drove to dealer down the Interstate (50 miles) a day later.  They was a recall on the brakes I was told along with a recall (I had a copy of that) for the additional of some insulation under the seats.

 

I asked them to inspect the box I brought along to convert my 3.23's to 4.10's.  Was told the rear wouldn't work, nothing about the fronts.  Then called the place I got the ring, pinions, bearings, etc.  from and was told the rear WOULD work, but not the fronts.  Conflicting information.  Was also told the front ring could be a welded on ring.  Hated to hear that.

 

My RPO code for the setup is:  SU5, G80 (locking RR), and  GUS (3.23's).

 

Have made a helluva lots of Internet inquiries, phones calls and now I'm thinking NO ONE knows anything for CERTAIN of how/what to do the get this thing geared down.  Was also told I needed to purchase a GM 84557636 front diff assy for around $1,000.  Then, I was seeing that even that won't work on the 2019 LT Silverado New Body Style.  I only have 3,000 miles on it and it's kind of a toy for me, so gearing it down was kind of a fun thing to do.  I  used to do all this on my NHRA drag racer years ago, but boy things are not so easy now.

 

I guess I'll have to wait a year before any concrete information is "concrete".

 

If anyone has more verifiable info, I'm all ears.