Fox Performance 2.5 with Eibach HD Lift Springs Experience

[Valhalla]

sliders, skids all except trans

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[ThunderFlash]

@Snacktime and @SierraBronco, the background here. I've already got the Fox Performance 2.5 shocks that are intended to be used with HOSS 2.0 or 3.0 takeoff springs. BUT I wanted/needed a higher spring rate. I went with the Eibach HD/lift HOSS replacement springs. I was hoping to set the Fox Shocks to zero lift and let the Eibach springs do their thing . That worked out pretty well in the front, but the rear came out higher than I wanted it probably because of my total 2-door coolness. I have run out of adjustment in the rear shock and I'm still high. Also, with the very little pre-load in the back, I'm thinking it's maling for a little unbalanced feel. I'm fairly satisfied with the spring rate, but I think I need a slightly shorter rear spring. I could cut a coil out, but the Eibach springs are not a straight wound spring, being progressive at the top, and a bit tapered down in diameter to the perch diameter at the bottom.

Hence my curiosity in OEM spring rates.

 

[Snacktime]

@Snacktime and @SierraBronco, the background here. I've already got the Fox Performance 2.5 shocks that are intended to be used with HOSS 2.0 or 3.0 takeoff springs. BUT I wanted/needed a higher spring rate. I went with the Eibach HD/lift HOSS replacement springs. I was hoping to set the Fox Shocks to zero lift and let the Eibach springs do their thing . That worked out pretty well in the front, but the rear came out higher than I wanted it probably because of my total 2-door coolness. I have run out of adjustment in the rear shock and I'm still high. Also, with the very little pre-load in the back, I'm thinking it's maling for a little unbalanced feel. I'm fairly satisfied with the spring rate, but I think I need a slightly shorter rear spring. I could cut a coil out, but the Eibach springs are not a straight wound spring, being progressive at the top, and a bit tapered down in diameter to the perch diameter at the bottom.

Hence my curiosity in OEM spring rates.

Pretty sure your are running a 3-4" over stock coil, eibach regulars are a 1-3" spring. You might want to try Dobinson springs.

 

[ThunderFlash]

Pretty sure your are running a 3-4" over stock coil, eibach regulars are a 1-3" spring. You might want to try Dobinson springs.

Eibach advertises the rear as +1.2" - +1.8" lift and +500 lbs on a HOSS shock body. I'm replacing my leaking Eibach Pro Truck 2.0s. With those, I started with the standard spring on the rear and it was no bueno. Super soft and squishy, lots of bottoming out. Replaced the standard springs with the +500 lb HD Pro Truck spring and it was mucho bueno, though I had the rear shock perches two threads up from being full low with those HD springs, too. It was about 1/2" or 3/4" of rake on those, but it is like 1.5" to 2.0" of rake on these Foxes.

I believe it's my WT 2-door. A '22 4dr, V6, Auto Badlands curb weight is over 500 pounds more than my '22 WT was from the factory. I've definitely added 500 pounds to MY TRUCK, but I don't think I've added 1,000 pounds to my WT (certainly not over the rear) to also account for the model to model weight differences.

I think I need an HD spring with no lift. I can then get the lift I need from the Fox Shock perch adjustment. I may be thick, but when I checked, I didn't see Dobinson advertising that on their web page. I called and asked Eibach, and they said they offer no such animal.

 

[SierraBronco]

Eibach advertises the rear as +1.2" - +1.8" lift and +500 lbs on a HOSS shock body. I'm replacing my leaking Eibach Pro Truck 2.0s. With those, I started with the standard spring on the rear and it was no bueno. Super soft and squishy, lots of bottoming out. Replaced the standard springs with the +500 lb HD Pro Truck spring and it was mucho bueno, though I had the rear shock perches two threads up from being full low with those HD springs, too. It was about 1/2" or 3/4" of rake on those, but it is like 1.5" to 2.0" of rake on these Foxes.

I believe it's my WT 2-door. A '22 4dr, V6, Auto Badlands curb weight is over 500 pounds more than my '22 WT was from the factory. I've definitely added 500 pounds to MY TRUCK, but I don't think I've added 1,000 pounds to my WT (certainly not over the rear) to also account for the model to model weight differences.

I think I need an HD spring with no lift. I can then get the lift I need from the Fox Shock perch adjustment. I may be thick, but when I checked, I didn't see Dobinson advertising that on their web page. I called and asked Eibach, and they said they offer no such animal.

Find out the spring rate and length of the coils you currently have. You could then measure the compressed length while sitting, and from that information figure out what springs might be better suited for what you’re trying to accomplish. @87-Z28 is very helpful on those calcs

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