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Old 12-18-2006, 01:07 PM   #1
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Transfer Case Lowering

Fist of all Hello.

This is my first ad in this forum and I am looking forward of some intersting talks.

Alright, I am planning to intall a 3 inch lift kit on my 94 Wrangler,
the only problem I have is that I don't know how to lower the transfer case.
I mean, I know what I need to lower that thing, but I just don't know how it will look like or how it works.
Does anyone has a good link where I can see it ??
Or even a picture would work out.
If anyone has a picture, than you can send it to nuadu78@aim.com

thanks in advance

nuadu78

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Old 12-18-2006, 02:30 PM   #2
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A Tcase lowering kit is just two bars of square tube that bolt between the skid plate and the frame. The skid plate is in the middle under the jeep and the tcase is bolted to that. you just remove one side at a time and slip those in. very easy. Although with that much lift I dont think you need one.

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Old 12-18-2006, 02:42 PM   #3
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Just put 3" lift springs and new shocks, etc. on my 93 YJ. Didn't do an x-fer case drop yet. I want to see how it rides after the new leaf springs settle in a little bit. Initially, I had some drive line vibes from the rear pinion angle being a little to sharp. 2.5 degree shims added to the rear springs solved the problem with the vibrations.

I don't want to drop the x-fer case unless I have to. It kind of defeats the purpose of lifting the Jeep if you're going to make its' belly lower.

Just my 2 cents!
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Old 12-18-2006, 05:26 PM   #4
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Lift kits like the 2-1/2" RE, have 6 pucks that are 1" thick. You loosen the skid plate bolts and drop one side then the other. Kit includes new longer bolts and fresh flat washers.
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Old 12-18-2006, 05:41 PM   #5
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Quote:
Originally Posted by nuadu78 View Post
I mean, I know what I need to lower that thing
Lowering a t-case is to fix a specific angle problem. You do not know if you will have the problem or not.

When a smooth output of a t-case goes through a u-joint bend, the momentary speed of the drive shaft (degrees of rotation/time) varies, meaning the drive shaft goes slightly faster and slower during each part of a revolution. A correspondingly equal bend as the drive shaft attaches to the axle pinion perfectly compensates and the pinion spins as smoothly as the t-case shaft. If the bends are not equal, that speed difference shows up as a vibration.

After a lift, the drive shaft bend at the t-case and at the axle should be exactly the same, meaning the output shaft of the t-case and the input of the axle are parallel (not on the same line, just parallel), it should be fine with a 3" lift. If the lift gets tool tall (the parallel lines get further apart), the bend angles of the drive shaft, although still providing a smooth ride, start to cause a short life spans on the u-joints.

Lowering the t-case (tipping it down), and a corresponding altering of the axle pinion angle (tipping it up) to keep the lines parallel, simply makes the two parallel lines close together so the u-joints last longer. In most cases, 'vibes' are due to mismatched angles. A t-case kit can reduce the mismatch and eliminate a good part of the vibe, but at the cost of reducing clearance. Altering the pinion angle is a better way to fix the vibes as it keeps good clearance.

Do your lift. Keep the lines parallel, and you should have no problem with only 3 inches.
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Old 12-18-2006, 08:56 PM   #6
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alright, thanks for the feedback from all of you.
That will help me big time.

nuadu78
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Old 12-18-2006, 09:43 PM   #7
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Here's a few quick pics from the drivers side of my Jeep. (It won't be on here much longer)

Side shot:


From rear tire looking toward front tire:


From front tire looking toward rear tire
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Old 12-18-2006, 09:47 PM   #8
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I just realized I should have metioned that these pics are of a TJ.
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Old 12-19-2006, 05:37 AM   #9
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Quote:
Originally Posted by Simple Scout View Post
I just realized I should have metioned that these pics are of a TJ.
I was just about to comment on how nice of condition that frames is for a YJ....
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Old 12-19-2006, 07:59 AM   #10
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Quote:
Originally Posted by Odd is he View Post
I was just about to comment on how nice of condition that frames is for a YJ....
I worked hard on that! Then I realized I was in YJ chat.
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Old 12-19-2006, 10:28 AM   #11
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Cool

Thanks for the pics

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Old 12-19-2006, 11:29 AM   #12
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Nice explanation JeeperDon.

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