None that I can hear. Keep it moist (lubrication) and you should be good to go. The coil will stretch with rear suspension compression as the leaf spring pack grows longer from the axle back... (which is why the RAS is placed there), but that's about the only moving part once installed and underway. There are no rattles, no squeaks.

 

No

 

Thanks everyone for all the help.
I'm excited.
I'm getting the HD RAS and hope to install in a couple weeks. Life is such a hassle when you move a lot and tools/stuff are in storage.
If I'm satisfied after a week I'll figure out if any changes to the Fox coil overs (possibly lower for a slight rake since the front is about 5/8" higher than the rear?), then finally install the Morimoto Hybrids.

 

 

2018 Lariet
2 inch rear lowering shackles
2 inch rear wheel spacers
305/40 R22 rubber





er

 

Auto spring or Rough country level?

 

Na

 

6112 and 5160
2.5F 2R
34 tires
RC UCAs

 

Installed the R.A.S. today.
Used the 1mm +/- adjustment.
Only drove 12 miles, but the textbook reason why I would want it…windy, bumpy, hilly, cattle grates, potholes, 20-35 mpg patched asphalt road.
I’ll know more after a week, but I could definitely tell the difference. Not just because I installed it. The rear was “tighter” but not “harder” if that makes sense.
Looking forward to seeing how it performs over the week and measure the rear height now, it looks higher/about even, but I'll check if the front is still too high.

Importantly, if it raised the bed, I'll probably be able to install the Morimoto Hybrids now and not exceed the adjustment range.

Thanks to everyone for this!

EDIT:
Racked up about 80 miles in varying conditions, I notice positive differences other than when driving straight with no bumps. Very pronounced to me, NO WAY I won't have this from now on.
I measured the rear height, it went up about 5/8"+ with what I think is the minimum setting (1mm) but it's hard to know exactly how many turns of the spring one way or another translates to height change. I saw a video of someone installing and he felt a few turns one way or another made a difference but I don't know, it seems like a bit of an imprecise gray area, especially since you don't know until after the tires are on and the truck is on the ground. When using the spacer different areas of the spring opens up, other parts don't until more turns are made, so it's not even/linear.

I'm guessing even though I have the tow package (no trailer brake or HDPP/Max Tow), I feel such a big difference because I have the lightest spring rate with spring "A". There are four Ford OEM spring rates A, B, C, and D, each one getting heavier. I assume a stiffer shock and harder spring you wouldn't notice much of a difference with R.A.S. until really pushing it or towing?

 

Now that my truck is level with the R.A.S., I'm curious if I should consider removing the rear block and also lower the Fox coil overs? Lower the overall height of the truck? I know 2WD don't have rear blocks. What are the purposes of the rear blocks? Is it for towing? Or off road clearance? Or? I think it's 1"? Up sides/down sides to removing rear blocks?