Sharp Bouncing

rider997 wrote:

jeffreyduncan wrote:

I have a 2015 Chevy 3500 HD short bed, Crew with the duramax. It's setup with RS9000's in the rear (set at 9) and stable loads. Front shocks are Bilstein 5100. I have a Hellwig stabilizer in the rear. Truck is stock otherwise. No airbags.

I have a fairly heavy camper and took this setup out over the weekend for my first road trip. Everything went very well and I am generally pleased with the way it handles. However - I notice that I get an annoying fast bounce (I think from the rear). It's not a porpoise. It's more of a chucking. It happens a couple times per second it seems, when I am rolling over small bumps at highway speeds or over 40mph. It's not constant, and any larger bumps or dips are handled fine. It's more of an annoyance than a drivability issue.

You might consider the possibility that the rear shocks are contributing to the ride issue. I've had a similar issue with "defective" Ranchos in the past (Rancho claimed it was impossible, but changing to Bilsteins solved the issue, not to mention that I was weary of seeing oil dripping down my new Ranchos every time I walked out to the truck). I went straight to the Bilsteins for this truck. Tons of happy Rancho 9000 owners out there might have some insight.

Yep. I have heard both sides of the fence and tried the Ranchos first because they were adjustable. Had to send two back because they were broken out of the box (adjuster knob broken in shipping). Got the wrong series bilsteins for the front so now ordered two more. I am shocked OUT. To me it sounded like 50/50 Ranch vs Bilstein. If I can't resolve this with new 4600's up front, I'll try them in the back. Cheaper than many of the alternatives.