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Unread 03-28-2014, 12:16 PM   #1
UnlimitedJDB
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LJ and long wheel base drive line help

Ok, after a ton of research and back and forth in my head I need a bit of advice.

I currently have 3" of lift and want to do a tummy tuck. I'm set on the Nth degree skid which uses a low profile mount and will net me 2.5" or skid height, but only 1.5" of drive line lift for a total of 4.5" from stock. This is (based on reading I have done) the upper limit of lift in an LJ before needing an SYE and CV shaft. Also, I have just installed a 1 1/4 BL and 1" MML, so that will help a bit on pushing the 4.5".

SO the question is do I need adjustable upper arms to adjust the pinion angle with this much drive line lift, or does that only come into play when I install an SYE/CV? I can't seem to find the answer.

I dont want to buy the skid and then need adjustable arms, but I am ok with spacing the skid down 1/2"-1" for a few months until I have the funds for an SYE if there any vibes.

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Unread 03-28-2014, 12:46 PM   #2
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Quote:
Originally Posted by UnlimitedJDB View Post
Ok, after a ton of research and back and forth in my head I need a bit of advice.

I currently have 3" of lift and want to do a tummy tuck. I'm set on the Nth degree skid which uses a low profile mount and will net me 2.5" or skid height, but only 1.5" of drive line lift for a total of 4.5" from stock. This is (based on reading I have done) the upper limit of lift in an LJ before needing an SYE and CV shaft. Also, I have just installed a 1 1/4 BL and 1" MML, so that will help a bit on pushing the 4.5".

SO the question is do I need adjustable upper arms to adjust the pinion angle with this much drive line lift, or does that only come into play when I install an SYE/CV? I can't seem to find the answer.

I dont want to buy the skid and then need adjustable arms, but I am ok with spacing the skid down 1/2"-1" for a few months until I have the funds for an SYE if there any vibes.
While you're still running the stock drive shaft you'll want the pinion angle of the rear differential to be at the same angle as the output shaft of the transfer case. If that angle is off considerably, you may have vibrations and wear on your U-joints.

If you can't accomplish that with the factory arms, you'll want some Adjustable Control Arms. If you go to a SYE and CV shaft, the adjustable arms will allow you to point the pinion at the output shaft, which is proper alignment for a CV shaft.

Let me know if you have any other questions or would like a quote!

-Ryan
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Unread 03-28-2014, 01:11 PM   #3
Tonellin
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Yes you will.

I'm in the same situation right now except with the UCF ultra high clearance. You will need rear uppers at a minimum
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Unread 03-28-2014, 01:15 PM   #4
mike_dippert
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I spaced my skid plate down until I could afford the SYE. The MML will help.
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Unread 03-28-2014, 04:32 PM   #5
UnlimitedJDB
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Originally Posted by Tonellin View Post
Yes you will.

I'm in the same situation right now except with the UCF ultra high clearance. You will need rear uppers at a minimum
What is the net driveline lift with that set up? I am assuming you are using the lo pro mount?
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Unread 04-02-2014, 10:50 AM   #6
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No one else can chime in on this? I am thinking about buying/building a TMR cross member and then I can put it where ever I like and then build a custom alum skid. But I think the goal is still to only net 1.5" more drive line lift.
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Unread 04-02-2014, 11:31 AM   #7
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Maybe. The only way to find out is if you do it.
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Unread 04-02-2014, 12:37 PM   #8
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Quote:
Originally Posted by UnlimitedJDB View Post
No one else can chime in on this? I am thinking about buying/building a TMR cross member and then I can put it where ever I like and then build a custom alum skid. But I think the goal is still to only net 1.5" more drive line lift.
What else do you want? 4" is the maybe/maybe not zone for LJ's. Like I said before, I spaced down my skid before I could afford a SYE. If you don't want to spend money on something that may not work, save until you can do it all at once.
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Unread 04-02-2014, 01:11 PM   #9
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So what is on the list for a Rubicon Unlimited tummy tuck? I'm running the BDS 3" and 1" BL.
It doesn't need an SYE. And having the longer wheelbase helps too, right?
Just the MML and cross my fingers?
Plan to get Adj. control arms eventually, anyway.
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Unread 04-02-2014, 01:21 PM   #10
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I installed the(OME 2.5" and 3" BL) Nth degree tummy tuck, 1" MML SYE and New Rear CV drive shaft along with uppers and lower CAs from Currie... If you can not afford to do it right... right now... then I would say wait... and save up until you can go all the way... I am NOT an LJ but rather a TJ and i have had absolutely NO death wobble and have run this set up for about two years... would do it all over agian in a heart beat... good luck with your build
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Unread 04-02-2014, 01:24 PM   #11
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You'll nee a new DC driveshaft. Also, with just a 1" BL you're most likely going to have to do some hammer time on the tub to get the very large 241 wedged up in there. A cable shifter upgrade is also highly recommended (Novak or Savvy)
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Unread 04-02-2014, 01:29 PM   #12
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[QUOTE=j_bydesign;21800889] 3" BL /QUOTE]



got any more pics?
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Unread 04-02-2014, 01:46 PM   #13
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Quote:
Originally Posted by Tonellin View Post
You'll nee a new DC driveshaft. Also, with just a 1" BL you're most likely going to have to do some hammer time on the tub to get the very large 241 wedged up in there. A cable shifter upgrade is also highly recommended (Novak or Savvy)
I'm not a rubicon, so there is no 241 for worry about.

From the previous reading I have done most guys didn't need a DC shaft with 4.5" net lift, if using upper or lower adjustable arms, and some didn't even need adjustable arms.

I'm just trying to gauge what I need based on as many people's experience as possible.
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Unread 04-02-2014, 01:55 PM   #14
Tonellin
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Originally Posted by UnlimitedJDB View Post
I'm not a rubicon, so there is no 241 for worry about.

From the previous reading I have done most guys didn't need a DC shaft with 4.5" net lift, if using upper or lower adjustable arms, and some didn't even need adjustable arms.

I'm just trying to gauge what I need based on as many people's experience as possible.
Crap sorry, that got messy because I didn't quote '1 Long CJ' question. I thought you and him were the same person. I'd be hard pressed to imagine guys getting away without adjustables at that much lift. I've got the 3" BDS and with my UCF tummy tuck I've heard nothing but guys telling me I'll need a DC DS which bummed me out because I wasn/t originally planning on getting one

Quote:
Originally Posted by 1 Long CJ View Post
So what is on the list for a Rubicon Unlimited tummy tuck? I'm running the BDS 3" and 1" BL.
It doesn't need an SYE. And having the longer wheelbase helps too, right?
Just the MML and cross my fingers?
Plan to get Adj. control arms eventually, anyway.
My response above was to you not 'UnlimitedJDB' haha
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Unread 04-02-2014, 02:19 PM   #15
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You won't need a Novak cable kit. The Nth TT has its own solution to that issue, at least it did when I installed mine. Sorry cannot help with your question as I have a TJ and have 4" lift springs.
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