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Fox 2.0 arrived today!

Travis Whitmore

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gabekalp Enthusiast

gabekalp

Posted
Posted

That is a misleading statement. The spring preload is simply a condition of the assembly when it is not installed. Once installed, the weight of the vehicle compresses the spring until equilibrium is reached between spring force and weight of the vehicle.

 

Preload is a condition that only exists because the shock absorber extended length is limited.

 

If you could take suspension geometry out of the equation, moving the spring perch up and down would simply move the vehicle up and down, with no change in ride quality.

 

The reality is that this type of " lift" creates a change in mechanical leverage acting on the spring as the angle of the A-arm gets further from the horizontal position. The effect is a exponential change in suspension stiffness as the change in angle continues.

 

You can use spacers or change the spring perch height (which changes uninstalled preload) and the effect will be the same.

 

The effect of preload on these coilover assemblies in our truck situation is widely misunderstood.

 

 

 

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Gc773 Enthusiast

Gc773

Posted
Posted

TeeDub and I have been exchanging PM's in regards to the Fox 2.0 Coilover shocks. I'm posting this with the hope that this helps anyone that may be considering the Fox Coilover shocks specifically part number 983-02-086 for GM steel control arms. We know the issues that TeeDub has been experiencing with his specific install and response he has received from Fox.

Here is my ride and the issues I experienced with my install. 2015 GMC Sierra Z71 Doulbe Cab with steel control arms. I attempted the install myself, but sadly failed. The stock rancho shocks came off without incident. The Fox 2.0 overall length was about 1/2-3/4 " longer than would allow to set on top of the lower control arm perch. This do it your selfer put everything back to stock. This am I had a local mechanic install the 2.0's on all four corners. From the look of his lot it appears he has experience in lifting 4x4 vehicles and is the go to guy in the area in which I reside. Here's what he had to do to accomplish the install in approximately 1 1/2hrs with a test drive. He allowed me in the shop with him during the install and explained why he did each step.

 

A 2 3/4" driver side and 2 7/8" on passenger for lift was achieved out of the box as sent from Fox. Upper ball joint, brake caliper, tie rod end and sway bar link was removed to complete the install. In my mind this install should be left up to the experienced mechanic with the proper tools. As a side note, the mechanic suggested the only safe way in his experience is to use an hydraulic spring compressor and not to try and adjust while on the truck. At least for this particular shock as the adjusting ring serves both as an adjustment ring and lock. Best adjustment ring setup would be an adjustment ring then another ring to lock both together. The same used for the more expensive Fox shocks. I'm happy with the level and the ride is improved over most roads that I had driven today. Cheers

Travis Whitmore Enthusiast

Travis Whitmore

Posted
  • Author
Posted

So are the ones you bought the ones that are supposed to lift 3-4"? Even at 2.75 you may have to consider aftermarket UCA's.

 

 

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Gc773 Enthusiast

Gc773

Posted
Posted

The 3-4" lift is what one of the sales rep from Fox told me when I inquired about the proper shock selection for my truck. He stated some were reporting that 3-4" lift if it's preload is crank up. Yet the part number I referenced above when purchased through the online vendor the shock was listed as 0-2" on their website. Sad, but when you go on the Fox website and look up 983-02-086 part number it's not there on their search engine. So somewhere there's a huge breakdown in getting the proper info to the end user. The mechanic advised the angles seemed fine and the upper ball joint may or may not wear out in 40-70 thousand miles. I'm no engineer nor do I think I know everything, however, I would be willing to pay a few dollars extra for the 2.0's if they would improve the adjustment ring on the shocks to allow adjustment while on the truck without having to worry about stripping the threads.

jeff_94 Enthusiast

jeff_94

Posted
Posted
Technical Details

FOX983-02-086​

  • Fox 2.0 Performance Series Smooth Body IFP Shock
  • Aluminum
  • Extended 21.95 inch
  • Collapsed 13.85 inch
  • Stroke 8.1 inch
  • Technical Details

FOX985-02-018​

  • Fox 2.0 Performance Series Coil-Over IFP Shock
  • Aluminum
  • Extended 18.960 in.
  • Collapsed 14.890 in.
  • Stroke 4.070 in.
Both say they fit a 2014-2016 Silverado but the lengths are different. When I was dealing with leveling kits the only difference in aluminum vs steel control arms are the length of the bolts needed because aluminum was thicker and require longer bolts. with these shocks there should be no reason for a different length shock between the two control arms.

 

​

Travis Whitmore Enthusiast

Travis Whitmore

Posted
  • Author
Posted

Yeah, I noticed the bolts provided with my aluminum control arm kit didn't protrude all the way through the lower Fox strut mount. Wonder if they shipped the wrong ones. I went round and round with them over the length difference. I told them King and Bilstein sell the same part number for both. The only diff is if you're ordering UCA's since the aluminum trucks have a larger upper ball joint.

Travis Whitmore Enthusiast

Travis Whitmore

Posted
  • Author
Posted

Also interesting they're an inch shorter compressed but three inches longer extended than the ones I got. They'd be very difficult to get installed if they're 3" longer.

Travis Whitmore Enthusiast

Travis Whitmore

Posted
  • Author
Posted

I would like to see the difference in them when you get them back from fox. I wonder how much they crank them

Still waiting on the return shipping call tag. [emoji45]

 

Not sure what they're going to do. Crank these up or exchange them for the other part number. Seems Fox needs to do some research on these trucks and get it right. Sort of wishing I'd just sprung for the King setup, just didn't want to spend double the money.

 

 

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Gc773 Enthusiast

Gc773

Posted
Posted

TeeDub, based on the pics you sent to Fox of your aluminum control arms, have they determined if you have the control arms you referenced in post #22?

  • 2 weeks later...
Truckoholic1212 Enthusiast

Truckoholic1212

Posted
Posted

TeeDub, any update? I also just installed 985-02-018 and have the exact issue. Only lifted the truck a 1/2" then went back to stock height after a day of driving around. Went to 4 wheel parts and made an appointment to do the adjustment, after I had the same issue with renting a spring compressor. Now after reading this, think I need to contact Fox. My truck is a 2015 Silverado, CC, w/aluminum suspension.

Travis Whitmore Enthusiast

Travis Whitmore

Posted
  • Author
Posted

I heard today the service department is done with them (what ever that means) and they'll contact me tomorrow. I would highly recommend contacting them. They need to know there is an issue on these trucks. Contact Stephen Johnson at Fox. He is who I've been dealing with. [email protected]

 

 

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Truckoholic1212 Enthusiast

Truckoholic1212

Posted
Posted

I heard today the service department is done with them (what ever that means) and they'll contact me tomorrow. I would highly recommend contacting them. They need to know there is an issue on these trucks. Contact Stephen Johnson at Fox. He is who I've been dealing with. [email protected]

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Will do, thanks man!

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