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Old 09-13-2017, 09:27 PM
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00jeeper00's Avatar
Join Date: May 2012
Location: New Zealand
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HELP Please - JKUR Frankenlift Question

Hokay - so..

Ive had the following installed by my normal shop who do a lot of 4x4 work. We are in New Zealand so theres not a lot of Jeep work carried out by anyone as theres not a lot of Jeeps and less that actually make it out of stock form.

I built my lift like Johnny Cash built his Cadillac if ya know what I mean.

I am using RK 2.5" Dual rate springs with Bilstein shocks from the AEV Dualsport kit. Im also running Terfalex front lower control arms (sport series), teraflex 2.75" bump stop extensions, Synergy adj front track bar with brace and pinion shaft bracket too. Teraflex rear axle side rod bracket and brake line extensions. Fox adj dampner up front as well.

My question; I had, as parts lying around in my Jeep, some 1.75" spacers which the guys installed in the front to level the jeep up - will this be safe? Having 1.75" and dual rate RK springs? The spacers mean the springs are now seated outside of the cups at teh top (if that makes sense).

Also - I went with a 2.5" lift to avoid driveline issues but now think these might be inevitable with the spacers? 2.5 + 1.75 = 4.25 does that make sense? That said the top part of the dual rate coil looks all but compressed when the jeep is sitting flat on the ground...

Truck feels great though - not flighty at all etc but I do take my kids around in it and want to be 100% sure its safe.

Noted front caster after the lift was 3.6 also - the sheet said factory acceptable range was 3.7 - 4.2 - does anyone know if this is correct?

Any help or advice is greatly appreciated.

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Old 09-14-2017, 01:08 AM   #2
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Join Date: Apr 2015
Location: Aurora, IL
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Check how much actual lift you have in the front like this (see image).

If you like the way it drives then don't mess with it. Seems like you have a little less caster than I'd prefer but that's up to you. You've got the arms to adjust if you ever want to.

As far as driveline angles, your front shaft is going to be dependant both on lift height at road ride height, and shock length (for when you're at full droop if you off-road). I can't find the extended length of those shocks...

The additional spacers will affect the ride height, but doesn't affect your extended shock length.

I guess just keep an eye on it, listen for noises and check for it spitting grease or a ripped boot on the rzeppa joint by the transfer case. Teraflex also has those high angle rzeppa joints if you want to try that, I've had good luck with them although a couple people haven't, and you have to be careful on the install.

Another option is the geometry correction brackets, which will help maintain a better pinion and driveline angle through the arc of travel. But if you off road I hear they cause clearance issues.

Anyway I hope all this is somewhat helpful.

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Old 09-14-2017, 06:02 PM   #3
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That's quite a bit of lift up front, but the number 1 issue for me is those shocks... The AEV front Bilstein's are short to begin with and with the spacers you are going to have very little down travel. I think the shocks would probably top out when going over a speed bump. You need the next size longer front shocks.

Also, that's probably too much lift for those TF Sport arms. But how does it drive? If it's ok, then no need to change.

The top of the springs are collapsed at ride height, but expand during flex to allow for longer shocks and more suspension travel.
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Old 09-14-2017, 07:05 PM
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Join Date: May 2012
Location: New Zealand
Posts: 66
Yeah - I thought everything would work great within the tolerances Id worked out but the addition of the 1.75" spacers up front and the .75" spacers in the rear is what seems to have pushed the envelope. The guys who installed said it looked like a drag car ie ass up with no spacers in the mix.....

Ill measure the heights etc this weekend -

Thanks guys
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