Mozzer

Hi, I had read almost everything there was on here, recently installed 5100s all round on a 2014 with Z85 suspension code (towing package I think). My biggest complaint against the OEM from new was the rebound after a sizeable bump or compression. After a fairly sharp speed bump at quite low speed it felt like the tyres would bounce of the speed bump, then slam into the road, sometimes enough to bounce back up again. The Bilsteins on the second from lowest setting have improved things a huge amount, speed bumps can be driven over just like every other vehicle I've owned. The only harsher characteristic I have is the smallest road imperfections (joints in road, tiny holes) are slightly more noticeable. I only wish I'd swapped years ago. You can get better, even more compliant systems for a chunk more cash or you can look at the Eibach which is a similar setup. If you definitely don't ever want to level then you can order the 4600 Bilsteins for less money & the same performance AFAIK. Sent from my Moto Z2 Play using Tapatalk

That contact looks like it would be for the suspension topping out when airborne not bottoming out on landing. Sent from my Moto Z2 Play using Tapatalk

And that photo is with no weight on it I think. Sent from my Moto Z2 Play using Tapatalk

As Yondu says, & it is the one off the OEM shock that gets re-used. As stated, the higher the setting the less compressed that bump stop will be but still seems like it would be affecting performance of shocks. Sent from my Moto Z2 Play using Tapatalk

Now that's a fix [emoji1786] Sent from my Moto Z2 Play using Tapatalk

Wow, so it's more like a spring helper than a bump stop. It must have an effect on how well the shock an function. Sent from my Moto Z2 Play using Tapatalk

I'm on the second setting, need someone to chime on who is set on 3rd or 4th. I was able to feel the bump stop by poking my finger up under the dust boot. Oo, er Missus [emoji16] Sent from my Moto Z2 Play using Tapatalk

For anyone who has a vac pump that hasn't gone bad, yet... Is there any possibility of putting a screen / filter in line so that if it does die the rest of the booster system & engine won't ingest oil & metal? Sent from my Moto Z2 Play using Tapatalk

Ok, confirmed it sits on the bump stop. There is 1 3/8" shock travel left with one wheel jacked up, that all goes away with the weight on. Sent from my Moto Z2 Play using Tapatalk

Mine is standard 18" rims & tyres at the moment. Sent from my Moto Z2 Play using Tapatalk

May do, but would need to know for sure that the shock cannot bottom out inside as that would be lethal. Sent from my Moto Z2 Play using Tapatalk

Mine is at 2nd stop, but yes that would make sense. My guess is stock shock is most likely worse as it has softer damping so compressing bump stop more when hitting a bump in the road. Sent from my Moto Z2 Play using Tapatalk

Ok, after typing the above, curiosity got the better of me. I cannot get the dust boot out of the way enough for a photo but it absolutely feels like the bump stop is sitting on top of the shock body & I can't move it up with my fingers. Next step will be to take the weight off & see how much the suspension compresses with the truck weight. If this setup really is allowing the bump stop to be partially compressed most of the time that seems very strange. Sent from my Moto Z2 Play using Tapatalk

Going back to this bump stop situation, did you find anything else in this regard? I had about 2" of travel showing between the shock & bump stop when it was assembled but no weight on it. I don't know how much the truck compresses this but I doubt there is much stroke left before the bump stop is contacted. This might be part of the problem with the OEM shocks, allowing the suspension to bottom out easily & bounce off the bump stops. I will try to see if I can check the gap to bump stop with the truck on the ground. Sent from my Moto Z2 Play using Tapatalk

It looks like it is external but probably a bitch to get at, I'm guessing pulleys need pulling which probably requires a load of stuff out of the way. #32 below. Sent from my Moto Z2 Play using Tapatalk

Am I missing something? Further up the page someone said $130 part which is external to the engine. I would also like to know what is involved if changing as a preventative measure & if the part has been redesigned or any aftermarket parts are preferred. Sent from my Moto Z2 Play using Tapatalk

At the price the Tahoe / Yukon 6112s are I would have expected a threaded body for adjustment on the truck & a decent top mount, not re-using the stock rubber stuff. Sent from my Moto Z2 Play using Tapatalk

The GM parts sites list Silverado, Sierra, Tahoe, Yukon as fitment for the same spring & strut part numbers so wouldn't aftermarket be the same situation? Sent from my Moto Z2 Play using Tapatalk

Disabling grade braking as above is reset after my truck is restarted, also doesn't change my shift problems, just prevents the down shifts when going down a long hill with brakes applied. Sent from my Moto Z2 Play using Tapatalk

Probably a typo for TSB Sent from my Moto Z2 Play using Tapatalk

Not AFM from my experience, same shifts if left in M5. My dealer service tech found a bulletin of some sort that mentioned a clunk during 2nd to 3rd shift when cold (i.e. First shift of the day). Mine does this every morning, winter or summer. The description was something about bolts inside needing threadlock & retorquing. I doubt this is my problem as it's been the same from day one but I'm going to get it in to the dealer before my 5 year warranty runs out in June. Sent from my Moto Z2 Play using Tapatalk

Does the phone have to be in the truck or do you just need to be in Bluetooth range? Would be handy if you can unlock with your phone if you manage to lock the keys in the truck. Sent from my Moto Z2 Play using Tapatalk

In response to the earlier post (below), I ran seafoam through my intake a while ago, got a lot of smoking but also had greatly increased fuel consumption for around a week & reduced power. I checked various things, cleaned MAF sensor, no change. It eventually got back to normal after driving it really hard for a few trips. My guess would be the gunk in catalytic converters as mentioned. "If by chance that chunk of carbon doesn’t score the cylinder wall and makes it out the exhaust, will that superheated chunk get lodged into the catalytic converter and cause damage" Sent from my Moto Z2 Play using Tapatalk

[emoji16][emoji16] Has the wife read that? Sent from my Moto Z2 Play using Tapatalk

Thanks very much for your input. I think I'll give the 5100s a try, difficult to see if my standard shock is the same or similar to your 2018 as oem sites list 4 or more different standard front shocks depending on model reference (6A1, 6A7 etc, etc) & I haven't found what those codes relate to yet. Sent from my Moto Z2 Play using Tapatalk