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Two Hour Wonder: Putting The Fox In The Penthouse

Posted in How To: Suspension Brakes on April 20, 2017
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Much like Barry Bonds career stats, this month’s One Hour Wonder comes with an asterisk. There’s actually two halves to this job that need to be done: one to each shock that is, and they each take about an hour.

RPG’s Corey Kausch says Ford didn’t want anyone to be able to change the stock ride height of the Raptor, so Ford asked Fox to change their normal design for the Gen 2 Raptor coilover shocks in that they wanted to have a single groove where the split rings hold the lower spring perch to the shock, instead of the three that the previous Fox shock-equipped Raptors had. You know, the ones where you could adjust the front suspension action by adding or removing preload to the spring.

RPG offers two sizes of collars to level and even lift the front end slightly of a Gen2 Raptor. One adds 1.5 inches and the other lifts it 3 inches.

Seemed like a good thing to be able to do to us, but Ford didn’t think so. We don’t know why Ford would want to make a change like that, but they did and Fox did what Ford asked as Ford’s an account they probably want to keep happy.

RPG saw an opportunity to upgrade this arrangement and did so with their new Spring Perch Collars. These billet aluminum collars take the place of the split wedges and anchor the lower spring perches. They also can raise the front end either 1.5 or 3 inches, depending on which Spring Perch Collar you went with.

This job can be handled in the comfort of your own garage, with the shocks still on the vehicle. Of course, you’ll need to use a spring compressor to accomplish this. We like to live dangerously, at least force others to do so, so we had the RPG crew do the “on the truck” install method. We did stand back a little just in case the compressor slipped off the spring and launched itself across the shop.

A stock Gen 2 Raptor front suspension is good, but is about to get even better.

It happens, so use extreme caution when compressing the spring. No kidding.

Or, you can have the RPG crew do it for you (or a local shop). Either way, the benefit of being able to add preload to the spring is a good thing, and one that helps with fine-tuning the suspension. For more information on this part, give RPG a call.

Beneath that aluminum collar are split rings that ride in a groove in the shock. The stock lower spring perch slides over them, locking them and the perch into place.
The endlinks for the antisway bar are removed from the control arm. Once they are removed, the truck is put up on jackstands and a floor jack is used to lift the lower control arm so the spring is as compressed as possible. It’ll make the next step easier.
Here’s where things can go wrong in a painful way. One should always be careful when using a spring compressor, so take your time and don’t make any sudden moves.
With the spring compressed, a clamp is used to hold it up and out of the way.
Even with the weight off the collar, it takes a little persuading to get the stock collar up so the split wedges can be removed. RPG uses an aluminum block, but a piece of 2x4 will do the job too. Just don’t be pounding on the stock aluminum collar with a hammer, huh?
We don’t have a shot of the split rings coming out (check out the accompanying video—we got it there), but once they’re out, care is taken to ensure that the groove is clean.
The two pieces of the RPG collar are slipped into the slot and around the shock.
The Allen bolts are installed and tightened.
Being careful, the spring compressor is removed. Care is an operative word here; you don’t want this thing to slip off and rocket across the garage.
And in about an hour, the new RPG Fox shock leveling/lifting collar is on. Now go do the other side!


RPG Off-Road

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