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post #1 of 44 Old 03-02-2012, 05:12 PM Thread Starter
Trendsetter75
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Tummy Tuck Question

I have a 3.25 suspension lift with 1.25 Body lift, so I don't need a SYE or CV driveshaft, but I know with a tummy tuck you need a Body lift, and SYE kit, but do you need a CV driveshaft as well?


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post #2 of 44 Old 03-02-2012, 05:14 PM
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post #3 of 44 Old 03-02-2012, 05:20 PM
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do you also just need rear adj upper control arms or lower or both?

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post #4 of 44 Old 03-02-2012, 05:25 PM
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Quote:
Originally Posted by Coasttrash
do you also just need rear adj upper control arms or lower or both?
How much total lift your driveline will see depends on TT (not all created equal) but lets say you will be 5" plus. Orienting pinon and making things all fit would be a real challenge without both lowers and uppers.

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post #5 of 44 Old 03-02-2012, 05:28 PM
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Quote:
Originally Posted by Trendsetter75 View Post
I have a 3.25 suspension lift with 1.25 Body lift, so I don't need a SYE or CV driveshaft, but I know with a tummy tuck you need a Body lift, and SYE kit, but do you need a CV driveshaft as well?
The 3.25" suspension lift is borderline without needing a transfercase drop... the body lift really doesn't matter when it comes to driveline angles.

A tummy tuck will raise your T-case a few inches, thus putting more angle on your front and rear driveshafts...

Adjustable control arms would be ideal, and an SYE and CV driveshaft are pretty much mandantory unless you're tummy tucking a rig with no lift at all...

And one more item to add to your list would be a motor mount lift... to help reduce the rear driveshaft angle...
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post #6 of 44 Old 03-02-2012, 05:31 PM
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I know I will have to get both I just dont want to spend the money.................ughhhh SYE and DS and Adj arms along with the TT.......... wellfare here I come!

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post #7 of 44 Old 03-02-2012, 05:34 PM
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Quote:
Originally Posted by Necromancer_tat

The 3.25" suspension lift is borderline without needing a transfercase drop... the body lift really doesn't matter when it comes to driveline angles.

A tummy tuck will raise your T-case a few inches, thus putting more angle on your front and rear driveshafts...

Adjustable control arms would be ideal, and an SYE and CV driveshaft are pretty much mandantory unless you're tummy tucking a rig with no lift at all...

And one more item to add to your list would be a motor mount lift... to help reduce the rear driveshaft angle...
If you do SYE and CV driveshaft the MML effect on rear driveline is a rounding error. MML could be part of TT (Savvy) or could be done in connection with BL that TT might require but no need for driveline line purposes if doing SYE/CV.

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post #8 of 44 Old 03-02-2012, 05:37 PM
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Quote:
Originally Posted by Coasttrash
I know I will have to get both I just dont want to spend the money.................ughhhh SYE and DS and Adj arms along with the TT.......... wellfare here I come!
Remember 1" TT equals 2" tire size for belly clearance. Think about how much you would have to spend to do bigger tires right. TT looks like big number but actually pretty efficient.

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post #9 of 44 Old 03-02-2012, 05:38 PM
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I know it is just all of it has to happen in a short order going to moab in may! First time on the rocks well West Rocks haha

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post #10 of 44 Old 03-02-2012, 05:41 PM
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Quote:
Originally Posted by Coasttrash View Post
...I just dont want to spend the money...
Low COG's and tummy tucks aren't cheap, and there's no way around that fact. If you want clearance, you're going to pay for it one way or another. You might try spreading it out a bit...that'll make it easier to bear, and remember: everything you do to work towards a tummy tuck is a big improvement to your rig, overall.

Quote:
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I know it is just all of it has to happen in a short order going to moab in may! First time on the rocks well West Rocks haha
So wheel it like you have it, get some hard data from the experience, and build what you need. I don't see a problem, there!

If it's worth doing, then it's worth overdoing.

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post #11 of 44 Old 03-02-2012, 05:45 PM
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Quote:
Originally Posted by Coasttrash View Post
I know it is just all of it has to happen in a short order going to moab in may! First time on the rocks well West Rocks haha
I did Moab last year, no tummy tuck, sporting the dreaded shovel, but having good skids on everything proved to be a good move.
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post #12 of 44 Old 03-02-2012, 05:57 PM
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Quote:
Originally Posted by biffgnar View Post
If you do SYE and CV driveshaft the MML effect on rear driveline is a rounding error. MML could be part of TT (Savvy) or could be done in connection with BL that TT might require but no need for driveline line purposes if doing SYE/CV.
I already have an SYE and CV driveshaft, I also have adjustable upper and lower control arms front and rear. My rig is sitting on a Currie 4" lift front and rear, with Currie control arms in the front, and Savvy control arms in the rear. I'm in the process of installing the UCF UHC tummy tuck, and that will raise my T-case upwards by a couple of inches... I purchased the Brown Dog 1" lift motor mounts to help correct the driveline angles and make everything play nicely together.

If you see a flaw in my build than please feel free to point it out in my build thread.

Thanks!
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post #13 of 44 Old 03-02-2012, 06:02 PM
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Quote:
Originally Posted by Necromancer_tat

I already have an SYE and CV driveshaft, I also have adjustable upper and lower control arms front and rear. My rig is sitting on a Currie 4" lift front and rear, with Currie control arms in the front, and Savvy control arms in the rear. I'm in the process of installing the UCF UHC tummy tuck, and that will raise my T-case upwards by a couple of inches... I purchased the Brown Dog 1" lift motor mounts to help correct the driveline angles and make everything play nicely together.

If you see a flaw in my build than please feel free to point it out in my build thread.

Thanks!
If you already have SYE/CV and the only reason you bought the MML was for driveline then you wasted your money. Just reset the pinion. You are not beyond tolerances of CV driveshaft.

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post #14 of 44 Old 03-02-2012, 06:10 PM
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OP: I have the exact same lift: 3.25 SL and 1.25 BL

Which skid are you looking at?

I am doing a UCF skid (need to decide on which one) and have purchased rear upper adjustables (RC X-Flex), SYE for the 231 (PORC HD), and CV driveshaft (Adams). I have MML's when i did my JKS BL but just to be safe I am doing all of the above. 3 inches of lift is just enough to have to do the entire package... even the no BL skid will raise the t case almost 2 inches... the lo-pro mount is worth looking at but the SYE and CV shaft with the room for the BL take care of that. Adams or tattons have a good package deal for the SYE and CV shaft at around 425 if you are on a budget.

A tummy tuck is one of the best mods for the TJ but there is so much on the back end!
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post #15 of 44 Old 03-02-2012, 06:22 PM
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If you already have SYE/CV and the only reason you bought the MML was for driveline then you wasted your money. Just reset the pinion. You are not beyond tolerances of CV driveshaft.
The rear driveshaft is severely short, even with an SYE and the factory stock T-case location...

I'm sure I'm not beyond the tolerance of the CV joint at ride height on the street, but what about at extreme articulation off road? And then if I add another 2" with the tummy tuck, then how well will the angles play nicely together?

Honestly I don't know one way or the other, I just figured the extra $100 bucks was better spent than to risk damaging the several grand I have invested in the rest of the suspension...
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