FFR PDG GTM 2026 Teardown and Rebuild

[crash]

What we have were listed and sold as ZL1 hubs from a dealer. They have an SKF marking on them and are a direct fit replacement to the SKF and standard C5 hubs that we used previously. EDIT: Except for the spline count. The ZL1 runs the larger spline count, which IIRC is 33 splines. The bolt flange is larger diameter, it is also thicker. The hubs have an issue with some brake top hats, but not others because of the increased flange dimensions. Other than that there have been no issues. The ZL1 hubs use an external ABS sensor, and I am going to have to drill some holes and probably do some machine work to the C5/C6 uprights to get them to work. The ZL1 hubs I have do not have a GM type number on them which I was not expecting. Pretty much every GM part has a GM specific part number on them. I do find that a bit odd.

All bolt patterns are the same. Offsets I believe are either identical or very close to each other. I did not measure, but no interference issue when we swapped C5 for ZL1.