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Unread 03-09-2011, 10:51 AM   #1
NCUNLIMITED
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Alignment after spacers

I just installed 3/4" spacers on my LJ to level it out, am I going to have to do an alignment again or will 3/4" make that big of a difference? I did an alignment after I put the ZJ V8 coils on it a couple weeks ago.

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Unread 03-09-2011, 10:55 AM   #2
RowJ
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I would doubt the need for re-do on alignment.
Haven't done it on Jeep, but have added up to 2" coil spacers to my Dodge P/U with no side effects.

Purists will tell you to lenghten your sway bar arms, but I wouldn't with just 3/4" bump.

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Unread 03-09-2011, 10:56 AM   #3
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Think I just found my own answer!!! YES I DO!!
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Unread 03-09-2011, 11:30 AM   #4
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or not?? I don't know
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Unread 03-09-2011, 11:43 AM   #5
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Do it.
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Unread 03-09-2011, 11:49 AM   #6
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Yes, any change in front suspension height should be followed by an alignment. As ride height is increased, Toe-In changes, since the steering gearbox is raised in relation to the axle and Drag Link. See where the Tie-Rod and Drag Link are joined together? Imagine pulling those two parts upward at that point, like pulling a bowstring, which will increase the Toe-In...




Toe-In should be set at 1/16" to 1/8-inch (narrower at the front of the front wheels)...

http://www.4x4xplor.com/alignment.html
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Unread 03-09-2011, 12:09 PM   #7
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Quote:
Originally Posted by SpaceWrangler View Post
.... See where the Tie-Rod and Drag Link are joined together? Imagine pulling those two parts upward at that point, like pulling a bowstring, increasing the Toe-In...
But when you lengthen the drag bar, to recenter the steering wheel, you release that upward lift.....no?
You are moving the body on the frame a bit, because of the trackbar, but hear again, I've never had alighment or tracking problems when that happens.

Again.... fairly new to Jeeps. Just sharing my experience on vehicles in general.

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Unread 03-09-2011, 12:13 PM   #8
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Nope, you're not moving the body on the frame at all. Also, the Toe-In adjustment is done by lengthening or shortening the Tie-Rod. Lengthening or shortening the Drag-Link merely turns the steering wheel in relation to the front wheels (which remain still).

If the Tie-Rod went directly from Right Steering-Knuckle to Left Steering-Knuckle, a Drag-Link adjustment would be all that would be required.

But on Jeep TJ's the right end of the Tie-Rod is bolted to the Drag-Link, while the left end is bolted to the steering knuckle, which means that one small change in geometry at the Drag Link affects the Tie-Rod as well.
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Unread 03-09-2011, 12:19 PM   #9
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Thought you were saying pulling up on the drag link increases tow in??

Well, I'll get a chance to find out for myself. Ordered 1" spacers last week to lift front end a bit! I'll check the alignment before and after.

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Unread 03-09-2011, 12:25 PM   #10
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Quote:
Originally Posted by RowJ View Post
Thought you were saying pulling up on the drag link increases tow in??
Theoretically... pulling upward on the drag link, as that movement would relate to an increase in lift height, yes, that would increase Toe-In, like you were pulling on the string of a bow and the legs of the bow are pulled inward.

But to actually adjust the Toe-In, you lengthen or shorten the Tie-Rod. The Drag-Link adjustment has nothing to do with the alignment except to re-center the steering wheel when you're all done.

Sorry for the confusion.

Have a friend jack up the right front of your Jeep by the frame while you watch from the front, and you'll see how the front suspension moves as the springs lengthen.
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