AHC Height Offset Utility How-To (1 Viewer)

[skrypj]

I guess I was referring to the spacers. I've seen the part number for the front spacer and then generic 30 mm spacers for the rear. I guess I'm not sure what the rubbers will do compared to the spacer.

You want a spring spacer, to put the spring under more preload at a given ride height.

in the front, you could use a pre-load spacer under the coil or you could put a "leveling" spacer above the top hat of the shock to push the shock down. Since the AHC system sets the truck to a given ride height, it will return to the same height as before the spacers, but the additional preload on the coil springs will take some more of the trucks weight and reduce AHC pressure.

 

[grinchy]

Yes, that is one way. The other is to use spring rubbers to take a portion of the coil wraps out of the coil, which increases the spring rate.

It’s a different way to achieve a similar result, but as the actual spring rate is changed it is an effective way to offset increased static weight (like a front bumper or winch).

Unfortunately we can’t do much about compression and rebound as Ahc is a black box in that respect.

 

[bigezvol]

What is everyone using for the rear coil spacer? Brand? 20mm or 30mm? I'm not finding much for the 200 series.... are they the same for 80/100 series?

 

[NYC570]

What is everyone using for the rear coil spacer? Brand? 20mm or 30mm? I'm not finding much for the 200 series.... are they the same for 80/100 series?

These are the ones I'm running in the rear. They're 30mm. My AHC is completely stock though. I don't have sensor lift or HOU lift.

https://www.amazon.com/gp/aw/d/B09RG83H9Z?psc=1&ref=ppx_pop_mob_b_asin_title

 

[bigezvol]

You are likely experiencing a combination of things especially with sensor lift plus HOU being maxed out:

• In my experience, sensor lift will exacerbate the symptoms of worn accumulators
• Sensor lift increases fluid pressure, making ride slightly firmer
• You are out of down travel

I dropped the HOU .5" all around and still have the same shutter/rough ride issue at speeds between 70-80mph. to be clear ,this was going on prior to replacing the globes. I have also done another AHC bleed/fill just to make sure there were no air bubbles remaining. I have ordered spacers for front and rear and hope that clears it up.

Outside of an AHC or tire out of balance (which has been done by 2 separate shops), what could I be missing?

 

[skrypj]

I dropped the HOU .5" all around and still have the same shutter/rough ride issue at speeds between 70-80mph. to be clear ,this was going on prior to replacing the globes. I have also done another AHC bleed/fill just to make sure there were no air bubbles remaining. I have ordered spacers for front and rear and hope that clears it up.

Outside of an AHC or tire out of balance (which has been done by 2 separate shops), what could I be missing?

Driveshaft u-joints? I had some bad rear u-joints on a truck that felt tight when I checked them, but after eliminating the other possible causes, it ended up being the joints anyways. Went away once I had em replaced.

 

[bigezvol]

Driveshaft u-joints? I had some bad rear u-joints on a truck that felt tight when I checked them, but after eliminating the other possible causes, it ended up being the joints anyways. Went away once I had em replaced.

I'll pull them and check when I have time to get it on my lift. I'll do the spring spaces at the same time.

I keep forgetting this is an 11-year-old rig.

 

[skrypj]

Can someone help me understand this. This is the output for the AHC height control. I believe the "XX Height Adjust" outputs are the current offsets programmed into the truck(I am using a Launch X431 tablet, not Techstream) as they do not change as you raise and lower the truck, but they do change when you change height offset. So, since +0.8" is the maximum offset possible, and my current highest Adjustment is a RR at -0.126", does that mean I can add 0.9" to all sensors to get the RR to +0.8"?

 

[skrypj]

Can someone help me understand this. This is the output for the AHC height control. I believe the "XX Height Adjust" outputs are the current offsets programmed into the truck as they do not change as you raise and lower the truck, but they do change when you change height offset. So, since +0.8" is the maximum offset possible, and my current highest Adjustment is a RR at -0.126", does that mean I can add 0.9" to all sensors to get the RR to +0.8"?

View attachment 3688685View attachment 3688684

Nevermind. I got it. For some reason the HOU was not letting me go straight to 0.9" increase on all sensors. It accepted 0.9 on RR but none of the others. For some reason I had to incrementally increase each of the other 3 corners to get to 0.9" increase. so like go +0.3, +0.3, +0.3 for a total of .9