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  1. M

    Verifying that these rims fit & thoughts on looks

    As per Auroragirl's post from GM: https://www.gmt800.com/threads/gmt-t1xx-brake-upgrade.9501/post-28623 , it states that GM says that the biggest 20in tire that we can fit on our trucks is the 275/55R20. I currently have the 2025 factory 275/60R20 tires. So my tires are slightly bigger than what...
  2. M

    Verifying that these rims fit & thoughts on looks

    Finally got my nuts, lol The guy that I got the wheels from got ahold of the tire shop that installed his aftermarket set. They still had them, so picked them up. Saves me a chunk of change & not having to deal with the dealership. With the 2000 lungnuts installed. With the proper 2025...
  3. M

    GMT T1XX brake upgrade

    I have a Vin # for a 2025 Yukon at4 Ultimate 6.2L with the R4L rims & 4-piston calipers as I currently can not find a Vin for one the 6-piston setup. On GM's site, I select the 6-piston upgrade part package. It then asks for the Vin #, so I enter it. It then says that it's not compatible. The...
  4. M

    GMT T1XX brake upgrade

    I understand what you are saying. You're just the 1st person that I ever notice saying anything inregards to the ABS module when upsizing wheels. Even when I worked in shops that installed aftermarket rims. We did always tell people that the speedometer might be off, so they needed to it...
  5. M

    GMT T1XX brake upgrade

    This is the screen after selecting the more info tab. It doesn't specify as to which specific requirements are required. So I'm still at a lose as to why GM says that the Vin# that I have is no-go for the factory brake upgrade?
  6. M

    GMT T1XX brake upgrade

    Went on GMC's website to do some research. Went to the build a brand new vehicle link. It gave options for 2025 & 2026 Yukon At4 Ultimate. Tried with both the Turbo Diesel & 6.2L engines. The R4L Rim, which is what have, is the standard Rim. No optional rims were offered. Left everything as...
  7. M

    GMT T1XX brake upgrade

    Lots of interesting info. Never knew about the ABS module having tire specs in them. When selling them, we always matched the part number on them. Our system only gave a year, model, engine interchange on those. Didn't know about reprogramming them either. We usually just gutted the ABS system...
  8. M

    GMT T1XX brake upgrade

    Interesting read. I've never seen the rims referred to as "Glamour Wheels" before.
  9. M

    GMT T1XX brake upgrade

    Also, I don't see anyone mentioning about the dustshields. These are bigger rotors. So are the dust shields modified or replaced? I have asked these questions to several people who state that they did this mod, but no one has responded yet.
  10. M

    GMT T1XX brake upgrade

    Yes, what vehicle setup will make them say yes. Because theoretically you may need to swap those parts too? I know that the PPV comes with the 6-piston, but that is a different animal to compare against. Same as checking an Escalade. That is why I kept my comparisons strictly on the 2025 Yukon...
  11. M

    GMT T1XX brake upgrade

    While I understand that there are other differences involved for the older/smaller rims & the involvement about the quality/quantity of washers, that subject is beat to death on so many places & is not relevant to me as I'm using the larger rims that were designed to fit these brakes. I only...
  12. M

    GMT T1XX brake upgrade

    My original post states I've seen pictures of a 2025 Yukon At4 Ultimate with the same Rim as what I have but with the 6-piston installed. As of this past Thursday night, I could not find any for sale with that setup. GM offers the Brembo 6piston as a upgrade for the 2025 Yukon at4 Ultimate. When...
  13. M

    GMT T1XX brake upgrade

    This thread is about using the T1xx 20in rims with the brake upgrade. Yet people insist on talking about about is needed to be possibly done to fit smaller rims or regurgitating what I or someone else has already stated? Of course those older or smaller rims may potentially have issues, those...
  14. M

    GMT T1XX brake upgrade

    When I look it up, there are only 2 options. Without High Performance (4-piston). With High Performance (6-piston).
  15. M

    GMT T1XX brake upgrade

    Some factory 18s do not clear the 4-piston setup without grinding or spacers. I'm using the T1xx 20in rims that would've been paired with the 4-piston, so there won't be any clearance issues on that front. The 6-piston on the other hand, I conflicting info. As of right now, I can get a...
  16. M

    GMT T1XX brake upgrade

    I have read that before. Unfortunately nothing useful. It's mostly trying to fit 17, 18 or aftermarket rims on a gmt800 with 4-piston calipers. The T1xx came from the factory with 4-piston brakes, optional 6-piston. I'm trying to find the determining factor why some can have the 6-piston &...
  17. M

    GMT T1XX brake upgrade

    My truck, 2000 GMC Sierra SLT 1500 2wd ext cab. The 20in rims are from a 2025 GMC Yukon at4 Ultimate. RPO code R4L. Now that I've swapped to the 20in wheel setup, I'm looking to do the brakes. I'm looking to start with the fronts 1st. I didn't notice the info on this site. I did see info on...
  18. M

    My new to me 2000 GMC Sierra 1500 ext cab

    They are for the extended cab glass. The thought process behind these is that by being slightly longer, it'll make the glass tighter to the body when closed. Therefore reducing or eliminating a leak between the glass & window frame due to the age of the assemblies. This sounded sound to me...
  19. M

    My new to me 2000 GMC Sierra 1500 ext cab

    They are slightly longer than the OEM plastic version. Side by side comparison, so to speak. OEM is on top.
  20. M

    My new to me 2000 GMC Sierra 1500 ext cab

    A set of these just arrived from ebay, $14 shipped. These pieces are for extended cab model trucks and are made of aluminum.

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