Thanks for all the replies.
Whats your tire pressure?
35 PSI on the street.
What is the spring rate of the coils and did you change anything on the back suspension? Do you have additional weight over stock in front? When you turn the coil seat down to level the truck did the compressed length of the springs change?
I believe it is a 700Lb spring and nothing was changed in the rear, it is 100% factory. No additional weight in the front. I did not measure the spring before or after turning the spanner nut.
Set ride height much lower. How much sag does the suspension have? What temp is it outside?
What size wheels and tires?
Might want to try a softer coil spring if that doesn't help. Big shocks can handle softer linear rate springs better. Filthy Motorsports has a good selection of springs last time I checked.
Too many people set the truck up with too little sag "for looks". Can one of the GM guys confirm what angle the front universals should be at for optimal ride? IIRC, they should be only a hair above level. You can't level an IFS by just cranking the spring preload. That makes them too stiff every time.
By sag I assume you mean when the tire touches the ground until the jack is free to move under the truck, I have not measured this. Anywhere from 100* F to 35* F. 285/70/17 BFG KO2's on factory wheels.
I installed a set of 2.5 Kings on my 2011 Sierra about 4 months ago and the ride is really nice, much better than stock and bilsteins despite the lift and load range E tires. They are currently set to ~1.75-2” of lift on 700lb/in coils (standard for this application).
I talked with Ben at Filthy Motorsports (great guy and company by the way!) and he told me these springs are linear so unless you are getting coil bind on compression or hard stop on droop it should not ride roughly. It was also recommended that I not lift the front more than 2.5” for ride quality and that 2” is kind of the sweet spot for up and down travel.
As was asked by others - What else did you change at the same time you installed UCAs and Kings? Wheels, tires, etc
Only thing changed was Coilovers and UCA's
Did you over tighten the upper control arm bolts, thus binding the UCA? Everything I've read about the Kings in this application, is a great improvement in ride.
I torqued the UCA's to spec, then had the truck aligned after driving it a week. I would think the shop that did the alignment did not over torque them, pretty slick bunch of guys.
I measured the truck before adjusting anything and it was about 1/4" higher in the front vs the rear. I lowered the shocks 2 full turns on the spanner nut per side last night. Truck seems to ride a little better but that could all be in my head. I will drive it more this week if I have time and see how it does. I do not have the factory measurements in regards from center of wheel to fender well since the truck already had a 2" RC lift when I bought it.
