21+ IRS SAG issues when towing product design (looking for someone in Michigan)

[steiny93]

springs (variable rate, additional), dynamic stops (Timbren's), etc

 

[martinajm]

springs (variable rate, additional), dynamic stops (Timbren's), etc

I thought that the "new" independent rear suspension on this generation of Tahoe / Yukon prevented these options. I am very interested in stiffening up my rear suspension to avoid towing sag if possible. Do you have any specific information, i.e. a link to a product, that can be added to these to address sag?

 

[jforb]

lower the front a couple inches, you'll not notice the rear sag.

but then, I'm an idiot

 

[dbphillips]

Okay, Rock Auto does have the wrong pics for those part numbers, so I got gas shocks... Looks like you need two 85521600 air springs, which are out of stock, so we're on hold until the strike ends...

 

[dbphillips]

lower the front a couple inches, you'll not notice the rear sag.

but then, I'm an idiot

Uh, until you drive it _without_ a load?

 

[dbphillips]

springs (variable rate, additional), dynamic stops (Timbren's), etc

HD springs will screw up the ride empty and looking at them, the solid height concerns me.

 

[dbphillips]

Okay, the shocks listed previously are standard fit. I found an air shock part number and ordered it, but it seems no one has them in stock, so it may be a looong while.

 

[dbphillips]

Got an air spring to test fit. Unfortunately, it replaces the spring, which would mean a complete collapse if an air spring failed. Since they are only available with Magneride, I wonder if they can only be installed with Magneride.

And I'm a little nervous about the way it seals. The spring is wide open on the bottom and it seems there are a couple seal rings that seal off on the spring perch on the shocks. Makes me wonder how it stays sealed if a tire becomes airborne. Maybe the shock limits the travel enough to maintain contact.

 

[Polo08816]

this is a terrible idea, don't tie air suspension to the tow package

gmc's air suspension is hyper unreliable in cold climates, being able to not get it is a huge plus for those of us that live where it gets cold

I'm not a fan of air suspension that completely replaces a spring.

 

[dbphillips]

Seems we just have to wait until one of the aftermarket manufacturers makes something like this: