Transfer case drop vs. SYE - Jeep Wrangler Forum

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Old 06-03-2013, 02:17 PM
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Transfer case drop vs. SYE

Hey everyone,

Total Newb question here. I just ordered a Rubicon Express 2.5" lift kit for my '95 YJ (4-cylinder, 5-speed, completely stock) and my question is this: Since the kit comes with a transfer case drop kit, is that sufficient for my Jeep, or do I need to order a Slip Yoke Eliminator as well?

Also, I've read in this forum and other that some transfer case drops affect the shifter to the point that gear 2, 4, and reverse are unusable unless you cut into the tub. I'd like to avoid this so I'm wondering if I should forego the drop kit and just install the SYE. And if so, which ones are good?

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Old 06-03-2013, 02:30 PM   #2
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I currently run a SYE and slip driveshaft, but before I had that I had a 2" Tcase drop and had no issues shifting.

I have the Dick Cepek 3.5" lift and it came with a 1.5" tcase drop.

If youd ecide to get the SYE, do yourself a favor and get a BRAND NAME and PROVEN driveshaft, trust me, its worth the money.


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Old 06-03-2013, 02:49 PM   #3
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i have only heard of the shifting problem when doing a tcase drop and body lift
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Old 06-03-2013, 03:15 PM   #4
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OK I have the 2" BDS lift with the t-case drop and the only shifter problem I had was it was hitting the very front of my center console cup holders. So I took it out and moved it back an inch and a half and all is well.

Now I will suggest that you look at both of your motor mounts and the tranny mount, mine went south a few months after the kit was installed. It had NOTHING to do with the kit, they were just the OEM mounts and it was their time to go. Food for thought.

Forgot to add that for a 2- 2 1/2" lift the drop will be fine, you don't have to go the SYE route.
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Old 06-05-2013, 02:21 AM
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My springs are pretty flat at this point (still factory stock) so even with the 2.5" lift I'm guessing I'll get at least a 3-4" of total lift. Is it possible to not include the transfer case drop without any negative side affects?
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Old 06-05-2013, 05:59 AM   #6
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All stock springs are meant to run flat from the factory. A 2.5 inch lift will have a slight arch to them. But all you need with a 2.5 inch lift, is a 4 degree shim in the rear to roll the housing up. That will almost completely straighten out the driveshaft angles. I have that exact set up with no issues on my 94 YJ.
94' YJ Sahara 4.0, AX15, Dana 30&35, 2.5" spring lift, 31x10.50's on 15x10's Smitty XRC Front bumper,XRC 8000lb. winch, Smitty Rock Crawler Classic rear bumper,Smitty soft top and pocket brief top, poly bushings throughout..considering SBC transplant.

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Old 06-05-2013, 06:51 AM   #7
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Are you doing anything off road? A TC drop will hurt your ground clearance, so I'd consider it a temporary solution if you do anything off road.

As others have said, install the pinion shim with the rear leaf springs. See if you have vibrations. If so, install the TC drop. If not, you have no need for the TC drop, and you are done. Your other choice is a 1" body lift and a 1" motor mount lift. It improves your drivetrain angle without sacrificing ground clearance. You also gain 1" of extra clearance on your oil pan, which is nice.

I originally netted about 3.5" of lift over my stock springs with a Zone 2" lift. I think your estimate of 3-4" of lift is right on based on my experience.
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Old 06-05-2013, 07:17 AM   #8

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I also have a 2.5 / 5 speed, I ran a 3.25" lift for a couple years, I didn't use the TC drop or a SYE, no vibes at all. You may have a different experience, but try driving it before you put in the TC drop to see if it's even needed, if you do have any vibrations without the TC drop, you can also do the 1.25" body lift and 1" motor mount lift to cure the vibrations instead of lowering your skid. They call that skid a "shovel", and for a good reason, lowering it makes it even worse.

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