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Unread 08-16-2011, 08:38 PM   #1
thunderstar99
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1990 YJ Wrangler 
 
Join Date: Apr 2010
Location: Ft Campbell, KY
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Back from Afghanistan and need help!

I just got back from Afghanistan and installed my 3 1/2 inch lift with 1 inch shackles and was wondering if I needed to upgrade my rear driveshaft to make it longer with that much lift. Thanks, William

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Unread 08-16-2011, 08:44 PM   #2
dillonjm
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Welcome back bro.

The answer is: it depends. If you're not getting any driveline vibrations after the install at highway speeds then you don't need to worry about it.

Did your kit have a t-case skid drop with it?
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Unread 08-16-2011, 08:54 PM   #3
Dlambright
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Welcome home & thank you for your service! To answer your question, no you dont. You may need to shim the pinion up a bit if you get some vibes, but the driveshaft is fine with that much lift. You used a t-case drop kit with the lift right?
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Unread 08-16-2011, 10:39 PM   #4
thunderstar99
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1990 YJ Wrangler 
 
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Location: Ft Campbell, KY
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Yes I used the t-case drop kit and I also got it all put back together and the rear shackles are facing the wrong direction so I have to go back and take care of that. I had never done anything that big before and was surprised how easy it actually was. Had to replace a lot of other stuff because the po didnt maintain it mechanically. I will try to put some pics up. Thanks for the info I really appreciate it as this is my first jeep and first build and I think Im addicted.
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Unread 08-16-2011, 10:48 PM   #5
thunderstar99
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023.jpg

024.jpg
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Unread 08-16-2011, 10:52 PM   #6
DavidHoover
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That's one of the best looking YJ's i've seen in a while!!!
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Unread 08-17-2011, 08:52 AM   #7
thunderstar99
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1990 YJ Wrangler 
 
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Still have to retorque everything after it settles and then touch up on the paint to help with the rust and then on to the next part of the build.
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Unread 08-17-2011, 11:13 AM   #8
dadstoy
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Torque your shackle bolts to 45ft/lbs or so. Flexes better and rides better.
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Unread 08-17-2011, 11:34 AM   #9
Alfons
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Quote:
Originally Posted by thunderstar99 View Post
I just got back from Afghanistan and installed my 3 1/2 inch lift with 1 inch shackles and was wondering if I needed to upgrade my rear driveshaft to make it longer with that much lift. Thanks, William
Have a look at the slip yoke and see how far out the lift has pulled it, you'll see some clean steel where that part of the yoke was behind the seal & the farther out it is, the less connection there will be between the yoke and the output shaft. The drive shaft isn't affected by the body lift & with only a 1" shackle lift, the shaft extension shouldn't be bad, so you probably don't need to do anything. Be careful about the t-case drop kit, this can sometimes change the U-joint angles to the point of causing vibration - there are a number of pictures around on what the angles should look like, but ideally the t-case and pinion u-joint angles should be the same (unless you have a double-cardan joint at the t-case).
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Unread 08-17-2011, 11:45 AM   #10
dtn8tr
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Look at your front shackles...they are backwards. The rears are good. The front should have the short side of the shackle attached to the frame and the point should point into the center of the vehicle like this... > <, front and rear.
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