Uca replacement - JeepForum.com
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post #1 of 12 Old 04-21-2016, 07:20 AM Thread Starter
MMBOW
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Uca replacement

So i bought my 94 zj 4x4 and it only had one uca. I went to install a new one only to learn the prior owner swapped the other side with a home made extended uca, thus making the two non compatible . Question is how to tackle this. I went and got two factory uca's , BUT IF I REMOVE THE ONLY UCA WILL THE WHOLE THING FALL APART LOL ? I was going to put jack stands under the axle , remove it then replace both?? lemme know if this is correct plz

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post #2 of 12 Old 04-21-2016, 07:49 AM
wingless
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The method I use is to have the axle hanging w/ the chassis on jack stands.

When both UCA are removed the axle is still restrained by the LCA, springs, shocks and drive shaft.

It is likely that the holes will not align. I've used ratchet straps to pull the parts into alignment. Others put the wheels on the ground and turn the steering wheel to move the parts.

The UCA mounting points on the top of the axle have pressed-in bushings that deteriorate w/ time. Replacing those bushings can be a butt pain but is required to restore normal handling.
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post #3 of 12 Old 04-21-2016, 07:51 AM
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You can have both the UCAs out at the same time. You should have the jackstands under the frame (just behind the LCA frame-end brackets), not the axle - the axle needs to be drooping and free to move up, down, left and right so you can pull it around as necessary to line up the bolt-holes in the UCAs and the axle-end bushings.
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post #4 of 12 Old 04-21-2016, 07:53 AM Thread Starter
MMBOW
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Quote:
Originally Posted by wingless View Post
The method I use is to have the axle hanging w/ the chassis on jack stands.

When both UCA are removed the axle is still restrained by the LCA, springs, shocks and drive shaft.

It is likely that the holes will not align. I've used ratchet straps to pull the parts into alignment. Others put the wheels on the ground and turn the steering wheel to move the parts.

The UCA mounting points on the top of the axle have pressed-in bushings that deteriorate w/ time. Replacing those bushings can be a butt pain but is required to restore normal handling.

HMMM, Never crossed my mind lol. Ya ratchet strap for sure, but cool, im going to tackle this in a day or so... thanks bro
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post #5 of 12 Old 04-21-2016, 08:15 AM
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Remember to do final torque with the weight of the jeep on the axle to prevent preloading the bushings.

I've actually done UCA's on the ground, no ratchet strap required since, just put the jeep in 4lo and parking brake on, that will keep things pretty lined up. Pushing or pulling a tire gets you the rest.

Not that there's a lot of room to work doing that, but I was in a hurry, only took about 20 minutes.
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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #6 of 12 Old 04-21-2016, 10:17 AM
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Also, be careful removing the frame-end bolts on the UCAs. In a typically brilliant piece of Chrysler design, they're perfectly positioned to fall down inside the chassis rail if they're dropped while they're being pulled out. I removed the nut, then put my magnetic pickup tool onto the head of the bolt before I started working it out of the hole. Or you could try stuffing a rag into the hole it could fall into (you'll see it when you're there).

On the plus side, if they're factory bolts they have tabbed heads so you don't need to hold the head while you remove the nut.
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post #7 of 12 Old 04-21-2016, 12:44 PM
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Quote:
Originally Posted by kg6mov View Post
Remember to do final torque with the weight of the jeep on the axle to prevent preloading the bushings.

I've actually done UCA's on the ground, no ratchet strap required since, just put the jeep in 4lo and parking brake on, that will keep things pretty lined up. Pushing or pulling a tire gets you the rest.

Not that there's a lot of room to work doing that, but I was in a hurry, only took about 20 minutes.
On my XJ i also replaced them while it was on the ground using this method
Quote:
Originally Posted by AVR2 View Post
Also, be careful removing the frame-end bolts on the UCAs. In a typically brilliant piece of Chrysler design, they're perfectly positioned to fall down inside the chassis rail if they're dropped while they're being pulled out
I also did this while replacing the controlarms on my XJ.
There was a lot of swearing going on untill i caught it with a magnet..
If that had not happen it would take about 10 minutes to replace the arm, but now i had to play hide and seek for 20 mins with the bolt inside the framerail....

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post #8 of 12 Old 04-21-2016, 02:21 PM
kg6mov
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Yeah, I dropped the socket I was using down the frame rail twice the first time.

Now I tape the socket on the extension.
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1984 F250, 460 BB, T19, work truck/future tow pig
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Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #9 of 12 Old 04-21-2016, 02:25 PM
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They should stamp the design engineer's contact information right onto the part to facilitate them receiving appropriate feedback.


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post #10 of 12 Old 04-26-2016, 07:47 AM Thread Starter
MMBOW
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Got it done.. Ran into a small issue when the front bolt didnt want to play nice after installing the other 3 bolts, but a little jack action got it done thanks guys, shes sitting straight and driving 100% better.. No more bent springs... I do tho still have a knock when I gas it or nrake hard??? thinking I have a bad shock or motor mount?? That will be my next project lol
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post #11 of 12 Old 05-22-2021, 09:20 PM
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Quote:
Originally Posted by kg6mov View Post
Remember to do final torque with the weight of the jeep on the axle to prevent preloading the bushings.

I've actually done UCA's on the ground, no ratchet strap required since, just put the jeep in 4lo and parking brake on, that will keep things pretty lined up. Pushing or pulling a tire gets you the rest.

Not that there's a lot of room to work doing that, but I was in a hurry, only took about 20 minutes.

Really? I will try this. Just to make sure, you remove the tire, right? Or you didn't?
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post #12 of 12 Old 05-22-2021, 10:31 PM
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Quote:
Originally Posted by pleon09 View Post
Really? I will try this. Just to make sure, you remove the tire, right? Or you didn't?

Tire stays on.


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