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Old 02-18-2014, 02:23 PM   #1
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Long time Jeeper, new to JKs questions

I have had several Jeeps including my current 98 TJ, Well I just bought a 2012 Rubicon, and I have some questions that a search will not plainly answer. First of all it has a lift of unknown make. (but it looks suspiciously like RC...meh) So anyway I do like the way it sits but want to replace the coils and shocks with some better quality like BDS springs and Bilstein shocks. My question is how much lift do I need to keep running the 35s on stock Rubi wheels I have now. I have no idea ho much lift is currently on it. Question 2, It is an auto so, do I need a programmer to set different shift points to compensate for the larger tires? It runs great and shifts fine, but seems to be confused sometimes when running 70 mph and going up a hill, like it cant decide if it wants to shift down or just keep chugging in OD. Here is a pic, it may help with the lift question
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Old 02-18-2014, 02:36 PM   #2
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Welcome.. Of course it looks like a lift and if it is RC as you say.. then it's somewhere in the range 2.50 - 3.50 thou could be some sort of mix lift. (coil spacers, budge boost, taller coils or long arms hardware etc) but lets not get confused.. the tires add a slight lift as well. So if your planing on leaving the lift but replace the shocks.. go for the 2-4 upgrades.
as for the auto trans.. as I've stated in another post here.. this seems to be a common issue with all auto trans.. Granted the auto trans jeep wasn't really meant to be lifted that high. In that case a body lift would have been better. My feeling is that someone wanted to lift this jeep and take off road but after attempting a heavy trail and learn the auto trans just couldn't pull.. decided to give up on it.. In other words.. this jeep (auto trans) isn't set up to go off roading. (again in my words and my view)

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Old 02-18-2014, 02:36 PM   #3
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You can run them with no lift or the smallest is a 2.5". That's all I can help with others will tag along.

That looks like it has a 2.5/3" lift.
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Old 02-18-2014, 11:15 PM   #4
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Quote:
Originally Posted by JeepWranglerNation View Post
Welcome.. Of course it looks like a lift and if it is RC as you say.. then it's somewhere in the range 2.50 - 3.50 thou could be some sort of mix lift. (coil spacers, budge boost, taller coils or long arms hardware etc) but lets not get confused.. the tires add a slight lift as well. So if your planing on leaving the lift but replace the shocks.. go for the 2-4 upgrades.
as for the auto trans.. as I've stated in another post here.. this seems to be a common issue with all auto trans.. Granted the auto trans jeep wasn't really meant to be lifted that high. In that case a body lift would have been better. My feeling is that someone wanted to lift this jeep and take off road but after attempting a heavy trail and learn the auto trans just couldn't pull.. decided to give up on it.. In other words.. this jeep (auto trans) isn't set up to go off roading. (again in my words and my view)
Its not a spacer lift, coils and shocks for sure, Like I said I am not new to Jeeps just new to JK. And it being an auto is not the issue. My TJ is an auto and does fine offroad. This Rubi will climb straight up a wall . It has 4:1 crawl ratio for Gods sake. And lockers...Autos wont go offroad. Thats just stupid. Every high dollar tube buggy I have ever seen is an automatic explain that.
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2012 JK Rubicon (COD edition) 9.5cti Warn winch, Teraflex 2.5 lift.AEV Front bumper, AEV rear bumper and tire carrier. ARB on board air,35/12.50/17,PIAA lights, Rigid Ind.reverse LEDs, Currie adjustable control arms
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Old 02-19-2014, 07:12 AM   #5
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It could just be the picture, but it looks like it's sitting low in the back. A 2.5" coil lift will clear the 35's just fine. If you go over 3" with a 2 door you will get into other issues. Brake lines, drive shafts, etc.
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Old 02-19-2014, 08:00 AM   #6
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Quote:
Originally Posted by daggo66 View Post
it could just be the picture, but it looks like it's sitting low in the back. A 2.5" coil lift will clear the 35's just fine. If you go over 3" with a 2 door you will get into other issues. Brake lines, drive shafts, etc.
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Old 02-19-2014, 09:09 AM   #7
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In research that I have done, it seems that JK's can run up to 33's in stock form (probably need spacers). Based on your picture I would say you have a 2-2.5 lift. Many of these lifts will give you over 3" of actual lift especially if you don't have heavier accessories like bumpers and winches hanging off the front and back.

As for 35" tires you will need a programmer to make the adjustments to the computer. The best way to check your current status is to download a GPS speedo app on a smart phone and gauge it to the jeeps speedo. As you get up around 60 mph and past you will probably see as much as a 5 mph discrepancy or more.

Something like this should work:

AEV Conversions 30406007AE - AEV ProCal Module for 07-14 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec
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Old 02-19-2014, 04:29 PM   #8
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Quote:
Originally Posted by JeepWranglerNation View Post
Welcome.. Of course it looks like a lift and if it is RC as you say.. then it's somewhere in the range 2.50 - 3.50 thou could be some sort of mix lift. (coil spacers, budge boost, taller coils or long arms hardware etc) but lets not get confused.. the tires add a slight lift as well. So if your planing on leaving the lift but replace the shocks.. go for the 2-4 upgrades.
as for the auto trans.. as I've stated in another post here.. this seems to be a common issue with all auto trans.. Granted the auto trans jeep wasn't really meant to be lifted that high. In that case a body lift would have been better. My feeling is that someone wanted to lift this jeep and take off road but after attempting a heavy trail and learn the auto trans just couldn't pull.. decided to give up on it.. In other words.. this jeep (auto trans) isn't set up to go off roading. (again in my words and my view)

With all due respect those are some off the wall comments given that your sig indicates you have a long history of Jeep ownership. Those concepts may have applied to a 1970 Jeepster but not to 2007+ JK.


Given how stuffed the 35s look in the wheel wells, I doubt you have more than a leveling kit or small spacer kit. The Jeep is a recent model so look at the coils. If they are black they should have the part number on them from which you can confirm they are the stock coils or some factory variation.

You can replace the coils (BDS, Eibach, etc) and get a moderate amount of lift and improve the performance with the Bilsteins. I like the Bilsteins but many others like the Rancho 9000XLs because they are adjustable. Ideally stay below 2.5" of actual lift to avoid/delay other issues. Only spacers provide the amount lift they advertise. It is near impossible to predict how much actual lift you will get from coils particularly for a 2 Dr. You are on the right track.
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Old 02-19-2014, 10:21 PM   #9
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Thanks for all the advice guys, They are aftermarket coils, I got the stock coils in a box when I bought the Jeep. I believe they are RC, and that is why I want to remove them. (I have a long history of dealing with sagging RC coils). I just needed to know what size lift coils to order to clear the 35s, I know 35s may be a little overkill. But they are new so I'm going to run them. So from what I have gathered I need around 2.5. Also I believe the pic I posted is a little deceptive because it is parked sitting up a hill going into the back of the station. When it is sitting on level ground the front sits a little lower than the rear. I measured the front coils on the Jeep compressed and they are at 11in. The stock coils are 17in un-compressed. I know that doesnt really help anything, but it seems to me I may have 2.5 lift RC springs that have sagged to 0 lift, lol
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98 TJ 4.0 auto, 3 in BDS springs,Skyjacker shocks, RE control arms,1.25 BL, 8K winch, JKS track bar with ZJ steering,33/12.50/15, 8.8 rear, custom fab front/ rear bumper and tire carrier.
2012 JK Rubicon (COD edition) 9.5cti Warn winch, Teraflex 2.5 lift.AEV Front bumper, AEV rear bumper and tire carrier. ARB on board air,35/12.50/17,PIAA lights, Rigid Ind.reverse LEDs, Currie adjustable control arms
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Old 02-21-2014, 09:24 PM   #10
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With the factory fender flares you will need a 2" lift, 2" extended bump stops, and 1.75" wheel adapters. Don't forget to extend your front sway bar links or buy some longer rear ones and move the rears to the front.

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