The parking sensors are nice. I had mine turned off and I backed into a shopping cart some A-hole left behind my truck. Wound up shoving it into a curb and damaging my tailgate. The feature I like is the "heads up red alert" and "seat vibrate" when someone slams on the brakes in front of you or pulling a trailer with no brake lights and you are closing to fast. When I bought my truck I wasn't really interested in the "safety package" but now I like having it for sure.
2019-2020 Chevrolet Silverado & GMC Sierra 1500 - 2wd & 4wd Factory 17x8.0 Wheel Offset = +24 mm - Back Space = 5.44" Inches Factory 18x8.5 Wheel Offset = +26 mm - Back Space = 5.77" Inches Factory 20x9.0 Wheel Offset = +28 mm - Back Space = 6.10" Inches Factory 22x9.0 Wheel Offset = +28 mm - Back Space = 6.10" Inches Lug Pattern = 6 x 139.7 *** Please note: Brake caliper clearance has changed on the 2019+ GM vehicles. 2014-2018 Chevrolet Silverado & GMC Sierra 1500 - 2wd & 4wd Factory 17x8.0 Wheel Offset = +24 mm - Back Space = 5.44" Inches Factory 18x8.5 Wheel Offset = +24 mm - Back Space = 5.70" Inches Factory 20x9.0 Wheel Offset = +27 mm - Back Space = 6.06" Inches Factory 22x9.0 Wheel Offset = +24 mm - Back Space = 5.94" Inches Lug Pattern = 6 x 139.7 2007-2013 Chevrolet Silverado & GMC Sierra 1500 - 2wd & 4wd Factory 16x7.0 Wheel Offset = +31 mm - Back Space = 5.22" Inches Factory 17x7.5 Wheel Offset = +31 mm - Back Space = 5.50" Inches Factory 18x8.0 Wheel Offset = +31 mm - Back Space = 5.72" Inches Factory 20x8.5 Wheel Offset = +31 mm - Back Space = 5.97" Inches Lug Pattern = 6 x 139.7
After more thought and listening I think the rubbing & groaning noise may be the leaf springs, I think it's the axle twist acting on the springs, which are a known source or rear end noise on these trucks. I still have no idea on the slow speed clunk or knock sound on uneven ground.
Can't help you but mine does the same thing most mornings after sitting 12 hrs. Seems like it is the rear brakes dragging? Plus it clunks over any bumps or uneven surfaces. Planning a dealer trip soon.
Valvoline Advance Fully Synthetic 5w30 and a Delco FIlter every 5k miles Runs about $20 to $25 for a 5 qt jug from walmart Unfortunately after adding the running boards I can't slide up under the truck like I used to.
After about 1000 stop & go miles I got a teaspoon amount of oil out of the UPR Can. I just did a 5K oil change too. Oil was still at the top of the hash on the stick before changing. When I installed the kit the breather tube I removed was oil wet inside. I'm sure the intake was already soaked too.
The UPR I bought is the single sided $200 version. https://uprproducts.com/19-20-gm-chevrolet-gmc-truck-5-3l-single-valve-oil-catch-can-separator-plug-n-play/?_ga=2.152360185.1792572736.1587132329-469327756.1586022756 About $50 more than the JLT. The UPR looks to have more storage capacity and the hoses look more factory too. On mine the hoses are a little too long but I'm sure they would be easy to shorten. I will probably shorten the hoses when I do an air intake kit. The factory air box hide the hoses now. I'm no expert but the dual set up seems a little excessive for stock use engine. I would stay away from systems that put the recovered oil back into the engine.
The real shame is Borla came up with these improved flappers a few years ago and there is nothing available to buy? It would be great if they sold these individually! https://www.borla.com/blog/2018/03/28/borla-obtains-patent-for-pioneering-pocket-valve-technology/
The valve pivot point is located towards the top of the pipe. It is not like a throttle blade on an intake or carburetor where it pivots in the center of the bore. When the exhaust pressure is high enough it pushes the flap open and into the top of the pipe. The down side of this design is when fully open it blocks nearly 1/3 of the pipe opening. At wide open throttle this could be considered a restriction in exhaust flow.
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