Pro4x lift
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A spacer is a spacer. Stay with a top plate style that provides less than 2.5" for best ride. Anymore than that you'll want new UCAs.
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8,174 Posts
The pro4x use bilstein 4600 shocks. They are longer than the black OE shocks. when you add a shock top spacer and hit full compression the shock will bind (crush) before it hits the bump stop. You have a couple of options.
1-buy the prg 2" spacer that comes with a taller lower control arm bump stop
PRG Products
you will get some coil bucket contact at full drop. Get some small bumps for the upper control arm if the noise bothers you.
2-get the 1.5" spacer and avoid a bunch of issues.
PRG Products
3-piece together a ebay spacer, and taller bump
https://www.ebay.com/itm/SR-2-Front...%3A789a2b4c15f0a860b4a443bafffaa4ae%7Ciid%3A3
1-buy the prg 2" spacer that comes with a taller lower control arm bump stop
PRG Products
you will get some coil bucket contact at full drop. Get some small bumps for the upper control arm if the noise bothers you.
2-get the 1.5" spacer and avoid a bunch of issues.
PRG Products
3-piece together a ebay spacer, and taller bump
https://www.ebay.com/itm/SR-2-Front...%3A789a2b4c15f0a860b4a443bafffaa4ae%7Ciid%3A3
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3,886 Posts
First time I've heard of this, where did you get this info from?
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8,174 Posts
As my 4 year old would say. "From my brain". Thought it was pretty well known. Let me find you some reference.
"These are PRG billet lift spacers. Kit includes longer urethane bumpstops to prevent the stock shocks (especially Bilsteins) from crushing under full compression." from prg's description on 2" spacer.
Yes and no. Generally yes. A speed bump at speed however will have you strike the bumps stop.
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Interesting... Never noticed that bit from Greg. I wonder how much truth there is to that, IE: you bottom the shock before even touching the bumpstop or while compressing the bumpstop the shock bottoms.
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8,174 Posts
I was curious as well. Withthe prg 2" spacer installed, stock bump stop, boot off but boot spacer in the stack, the shock compresses perfectly with the LCA jacked up. However I placed a small zip tie on the shaft to monitor travel. Took it down a dirt road to bounce it around and it blew off the zip tie. Put the taller bump stop on and the zip tie survives.
Wonder if anyone has a stock black OEM front shock they would be willing to send me. Assume there are many blown out take offs from people installing Bilsteins.
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2,158 Posts
I can't send you my take-offs (F&R are still good, less than 15k on them), but I can give you measurements... hat to eye they are 16 3/8" unloaded. Shock body is 10 5/8". Compare that to your stock BIL bodies.
How much taller is the taller bump? the difference between a ProX & SV front shock may be a difference of 1/4"... Curious to see what you get for measurements.
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Thanks. That would be much easier then me trying to acquire an old shock. 10 5/8 shock body is top of shock body to eye? If you say the the black shcok is 1/4" shorter that would do it. The yellow bils are a perfect fit, but not when you conside the squish of the stock bump.
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the 1/4" is a SWAG, you'll need to measure your Bil body. This is just a guess as the only ride-height difference in the FSM is size of tire (and its less than 1/2"). How small a ziptie you use?Try using a mini ziptie like a 3" or 4" and see if they pop
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It looks like #2 for my 2012 Pro-4 daily driver. I talked to a local shop this week that has a lot of lift experience to do 2.5 front /1.5 rear. He had gone higher on non-PROs but after research he is not recommending that high for my PRO based on kit supplier concerns. I may go 1.5" in front for now and see ... :frown:
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