Rock Krawler Pro-X 4-Link Rear Conversion -- install, test, and review

[Pressurized]

Nice video, watched it yesterday. I received my RK 4-link kit last week so I'll be installing one too. Your video gave me a good idea of what to expect. Thanks!

BTW, you can get up-travel limiters for your Icon coilovers, that should solve your 37's rubbing at full bump.

I hate losing travel.... I'd prefer changing the mounting locations. I always design around minimum bump stop and maximum travel.

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[Dusty]

I hate losing travel.... I'd prefer changing the mounting locations. I always design around minimum bump stop and maximum travel.

I'd love to see your solution!

 

[EvanPeterson]

I think it was time to replace the whole rear axle, UD60. Save the OEM intact.

I’d contemplated that, but honestly… I won’t bother with a 60 until I’m ordering a wider WMS version, and doing something long travel in the front to match. The M220 is pretty stout besides the tube-twist…which this also helps.

 

[EvanPeterson]

I hate losing travel.... I'd prefer changing the mounting locations. I always design around minimum bump stop and maximum travel.

That’s a valid point. Maybe a solution to handle over winter? We barely got this taken care of, before event season hits full swing.

 

[Pressurized]

That’s a valid point. Maybe a solution to handle over winter? We barely got this taken care of, before event season hits full swing.

Many of these setups are in their infancy... Obviously, that rear Icon coilover was designed for a certain suspension and tire size. Bigger tires usually means more bump stop or more fender clearance.

So, with 37's, we're looking at a longer compressed length shock or changing the lower mounting point to fully compress the shock sooner (mimicking more bump stop without losing shock travel). This will also allow more droop/flex as long as the joints aren't maxed out on misalignment.

 

[DYak]

Cool video. I am going to have to go find a good speed bump because I haven't even noticed the rear end kick this kit fixes. Coming from years of driving lifted Jeeps, my stock Bronco still feels like a sports car. Is the rear end kick something that bugs a lot of you guys?

 

[EvanPeterson]

Cool video. I am going to have to go find a good speed bump because I haven't even noticed the rear end kick this kit fixes. Coming from years of driving lifted Jeeps, my stock Bronco still feels like a sports car. Is the rear end kick something that bugs a lot of you guys?

Thanks!

the rear kick wasn’t really a major complaint, and wasn’t super noticeable until experiencing zero of it at the exact same location…

It wasn’t an expected benefit, just something notable I thought was worth sharing

 

[robepa]

I have been eyeing the Teraflex suspension, their documentation says it has an internal bump stop so it seams well suited for this modification.
@EvanPeterson They list 12.4" of rear travel with 37" tires, how much rear travel are you seeing?

 

[Sitruc_btb]

Thanks!

the rear kick wasn’t really a major complaint, and wasn’t super noticeable until experiencing zero of it at the exact same location…

It wasn’t an expected benefit, just something notable I thought was worth sharing

Is that "kick" the modified roll center after lifting the Broncos? After lifting mine I noticed more body roll(no rear sway bar), until I added the RJ track bar bracket, and made an incredible difference in handling.

 

[EvanPeterson]

I have been eyeing the Teraflex suspension, their documentation says it has an internal bump stop so it seams well suited for this modification.
@EvanPeterson They list 12.4" of rear travel with 37" tires, how much rear travel are you seeing?

I’d have to do some mathing to say exactly how much the wheel travels, we just measured how far we could lift it while keeping the other 3 tires on the ground.

We technically got an incomplete measurement as it was, because the 3 tires were still firmly planted, but it started to dig into the fender and bumper… if they weren’t in the way, it had more room to go before one of the other tires would leave the ground.

I’ll have to get back to you, once we add the limiters to these shocks.

 

[EvanPeterson]

Is that "kick" the modified roll center after lifting the Broncos? After lifting mine I noticed more body roll(no rear sway bar), until I added the RJ track bar bracket, and made an incredible difference in handling.

we’ve felt it on both Broncos, and the Mrs’ isn’t lifted. i wonder, if we can get it on film with the mrs’ doing it in hers, if I’m driving behind her

 

[Sitruc_btb]

we’ve felt it on both Broncos, and the Mrs’ isn’t lifted. i wonder, if we can get it on film with the mrs’ doing it in hers, if I’m driving behind her

Interesting. Just a characteristic of the 5 link setup maybe? Great video. I remember RK saying a while back that they were working on big things, game changers for the Bronco.

 

[EvanPeterson]

Interesting. Just a characteristic of the 5 link setup maybe? Great video. I remember RK saying a while back that they were working on big things, game changers for the Bronco.

Yeah, just a quirk really.

thank you!

RK is definitely getting behind the 6G platform, pretty exciting.

 

[SierraBronco]

It seems like the RK kit is garnering some attention. We pre-ordered ours the day it went live on the RK website. We got it installed last weekend, and did a road-trip to an off road park to test it out the next day. Here’s our review, and hopefully answers any questions you may have if you’re thinking about the system for yourself!

Very awesome. Did you get the lower links too? I’ll be looking for the video when I get home

 

[EvanPeterson]

Very awesome. Did you get the lower links too? I’ll be looking for the video when I get home

we did install the x-factor lowers at the same time.

I now have an extra RK track bar, and regular x-factor uppers collecting dust

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