Quote:
Originally Posted by RUQWIKR
On the rear knuckles, at some point late in 2017 MY, FE4 cars were changed to the FEA rear knuckles. You can look at the bushings or take a mirror up against the back of the park brake backing plate to look at the knuckle assembly PN. There are two numbers cast in place on the knuckle. The drill point next to one of the two PN's shows which one it is.
I've swapped in the FEA front lower links and have the FEA solid cradle bushings along with the FEA knuckles to go in when I get some time. My car was built early Dec 2016.
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Thanks. Do we have a way to verify this? Maybe a build-date break point? Hopefully sooner rather than later the online parts catalogs will be updated accordingly.
Quote:
Originally Posted by Alpha1BC
R0H = 245/50R18 all-season tire (base LT tire)
R29 = 245/40R20 all-season tire (non-1LE SS front tire)
Googled "gm R0H rpo" and got this list  |
That's a great list!
That makes sense GM would change the dampers based on wheel/tire combo. The 20"s are undoubtedly heavier and would require stronger dampers to try to compensate for the added unsprung weight. Given only the FE2's have the ability to have 18"s or 20"s from the factory, it's probably safe to say that R29 = 20" wheel equipped 1LS, 1LT, and 2LT. Also, the SS's are summer-tire only, further reinforcing that the 20" all-seasons are 1LS, 1LT, and 2LT.