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Old 03-26-2014, 02:14 PM   #1
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4 inch lift "correct installation"

So I recently purchased a 4 inch for my 04 TJ 4.0L auto trans, there's been a lot of debate within my circle of buddies and people on here on what is "actually" needed to properly install a 4 inch kit on my DD so I have the RC 4inch short arm kit, everyone I've ever know to put a 4 inch on just slapped the kit on put some 33s on the bad boy and in my case I also got a heavier duty track bar, but people on here and within my circle of jeep dudes are telling me there's SOOO much more to a 4 inch lift then just the kit there tellin me I'm gonna need SYE/CV, drive shafts and a number of other things so guys and gals id like to know your knowledge of this and experience with a 4 inch on a TJ thanks

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Old 03-26-2014, 02:21 PM   #2
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Your 4" lift kit most likely came with either pieces of square tube or spacers to drop your transfer case skid down about an inch and a half. That drop is to take care of drive line vibrations that would be present without the drop. Most of us that offroad, don't like the already low skid lower. It goes from being a shovel to a dozer blade. The only way on a 4" lift to get the skid back up to it's stock position and not have vibes is with the installation of an sye and double cardan drive shaft. Doing this also necessitates the installation of at least adjustable rear upper control arms and an angled track bar bracket. Your lift will be fine with the transfer case drop if you're willing to put up with it.

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Old 03-26-2014, 02:33 PM   #3
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Your 4" lift kit most likely came with either pieces of square tube or spacers to drop your transfer case skid down about an inch and a half. That drop is to take care of drive line vibrations that would be present without the drop. Most of us that offroad, don't like the already low skid lower. It goes from being a shovel to a dozer blade. The only way on a 4" lift to get the skid back up to it's stock position and not have vibes is with the installation of an sye and double cardan drive shaft. Doing this also necessitates the installation of at least adjustable rear upper control arms and an angled track bar bracket. Your lift will be fine with the transfer case drop if you're willing to put up with it.
well I planned on getting a 1 inch body and getting undercover fabs tucked skid plate to get rid of the big on plow under there
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Old 03-26-2014, 02:37 PM   #4
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Water Dog made all the good points. To add to it, do you have an extra grand to throw at it? I'm talking a nice tummy tuck/belly skid. That will require a small body lift, motor mount lift, then your SYE and CV shaft. Some upper and lower control arms to adjust your axle pinion.

Now you're probably either thinking you've just opened a can of worms that's gonna cost way WAY more than you expected, or that I'm just another guy with another opinion, and that's probably true. The fact is that you will build a great foundation for your present and future upgrades, gain an inch or 1.25" more total lift and tire room (for when you go up to 35's), streamline your belly, and you're probably ready for new motor mounts and a new tranny mount anyway. It's worth looking into.
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Old 03-26-2014, 02:43 PM   #5
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Water Dog made all the good points. To add to it, do you have an extra grand to throw at it? I'm talking a nice tummy tuck/belly skid. That will require a small body lift, motor mount lift, then your SYE and CV shaft. Some upper and lower control arms to adjust your axle pinion. Now you're probably either thinking you've just opened a can of worms that's gonna cost way WAY more than you expected, or that I'm just another guy with another opinion, and that's probably true. The fact is that you will build a great foundation for your present and future upgrades, gain an inch or 1.25" more total lift and tire room (for when you go up to 35's), streamline your belly, and you're probably ready for new motor mounts and a new tranny mount anyway. It's worth looking into.
yea I've read that the uncover Fab kits require the motor mounts and I was going to go with brown dog I hade no issue with that but I've never heard of needed SYE or shafts for it looking at it now tho I can see some issues it would pose so maybe I won't go that route yet and just stick wit the 4 inch and deal with the plow, but as of now I'm just trying to get as much knowledge about all of this as possible because I'm stock piling parts so I don't have to tear this thing apart a million times over I'm just gonna smack it all together at one time
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Old 03-26-2014, 03:23 PM   #6
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yea I've read that the uncover Fab kits require the motor mounts and I was going to go with brown dog I hade no issue with that but I've never heard of needed SYE or shafts for it looking at it now tho I can see some issues it would pose so maybe I won't go that route yet and just stick wit the 4 inch and deal with the plow, but as of now I'm just trying to get as much knowledge about all of this as possible because I'm stock piling parts so I don't have to tear this thing apart a million times over I'm just gonna smack it all together at one time

Brown Dog makes some hefty mounts, but I've read were shipping can take almost a month. It was almost a month for me and they are 15 miles away.
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Old 03-26-2014, 04:15 PM   #7
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Old 03-26-2014, 04:17 PM   #8
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You have a couple options:

4" lift, NO SYE, 1.5" transfer case drop.
4" lift, SYE, no transfer case drop.
4" lift, SYE, UCF belly skid (this is a can of worms... you can add mml and UCF lopro tranny mount, etc etc).

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