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Discussion Starter · #1 ·
I installed 20pro4x struts on my 2009 4x4 LE. I also installed a 2” RC leveling kit in the front. I have the pro4x rear shocks but haven’t installed them yet.

The front looks and measures higher than the rear. When I measure the top of the wheel to the bottom of the wheel well, there’s a 2” difference. Is this normal? Wouldn’t the front and back measure the same hight if it was “leveled?” Is the pro4x suspension a unique height?

Since installing the leveling kit I have learned that 2” may have been too high, so I don’t really expect the front and back to be the same height. But the difference seems bigger than I would expect.

I plan on putting a 2” spacer in the back to truly level the truck, but I’m still confused as to why I would need 2” in front and back to level the truck.


after leveling:

Wheel Automotive parking light Tire Land vehicle Sky


Before leveling:
Wheel Tire Car Vehicle Sky
 

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Two things at play here. First, from what I understand, Gen2 Pro4X suspension is taller (OEM config) than other Gen2 or any Gen1. I think I recall reading that it's about half an inch or an inch taller. Additionally, you added 2" on top of that, which is more than the rake (1.5") on 08-up 4wd trucks, all of which were the same ride height, when on the same tire size. So you took a truck with a 1.5" rake and lofted the front 2.5-3", thus it is nose high.

You can certainly lift the back (I have some 1.5" blocks I'll sell you if you want them - I swapped to get a little more height). But in addition, you're going to need new front UCAs with that much lift. Otherwise you'll have coil bucket contact (CBC) and eventually crack your OEM UCAs. Options range from Rough Country (around $350) to Dirt King or Icon ($550-650 depending on your choice of bushings or heim joints). For quality for the dollar, the DK arms are very hard to beat. If you can find used (like I did) you can do heim joint arms for much cheaper. I paid $320 shipped for my PRG UCAs used.
 

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Discussion Starter · #3 ·
Thanks, that’s very helpful. I’ll probably replace the UCA’s. I haven’t installed the rear pro4x suspension. If the rear shocks are also taller than the gen1 base option, then maybe I wouldn’t need to rear lift blocks. Any insight into that?

If it turns out I need them to level the rear, I’ll reach out to you about your used set. Thanks!
 

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Unlike the front shocks (which include the spring), the rear shocks are separate from the leaf springs and provide only dampening rather than dampening and suspension support. To lift the rear, you either add blocks, or you add stiffer leaves to hold more arch in the leaf spring, or you swap to leaf springs with a higher arch.

I'm not sure if the OEM Pro4X Gen2 rear suspension is lifted or not. If it is, you'll need to be sure the shocks you use are suited to the suspension height you have in the rear. If the shock's extended length is shorter than your total suspension droop, it will become a jolting limiter to downward suspension travel. if the compressed length is longer than your suspension's minimum height at full compression, you'll break your shocks if you hit max compression on the suspension.
 
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