Uca joint touching strut at full drop

Uca joint touching strut at full drop

Postby suh4 on Wed, 07 Aug 2019 9:53 +0000

hi champs anyone had the problem when the front wheel fully drop the uca joint touches the strut? 3 inch lift, diff drop, caloffroad adjustable uca. 3rd photo is wheel on flat ground.

I think I definitely need a pair of high clearance cv boots but would the uca a problem like that?ImageImageImage

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Re: Uca joint touching strut at full drop

Postby hiluxxury on Wed, 07 Aug 2019 10:13 +0000

Its a thing. Will the boot pinch or is it just touching?

Surely your alignment be adjusted to fix that?
I might be wrong.

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Re: Uca joint touching strut at full drop

Postby DeadlyBeast on Wed, 07 Aug 2019 11:10 +0000

High clearance CV boot?

The 2nd pic looks like your CV is over extended at that angle - does it bind when you try to rotate the wheel?

What is the full extended length of your struts? Measure from top hat mounting surface to centre of lower eye bolt. Can be a little tricky when the strut is installed but can be done.

Anything around and over 580mm can cause this issue.

Take a pic of the top hat too. The top hat for that strut may need a deep cup.

Could be as simple as rotating the UCA ball joint as hiluxxury suggests but that CV angle looks excessive
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Re: Uca joint touching strut at full drop

Postby suh4 on Wed, 07 Aug 2019 2:21 +0000

DeadlyBeast wrote:High clearance CV boot?

The 2nd pic looks like your CV is over extended at that angle - does it bind when you try to rotate the wheel?

What is the full extended length of your struts? Measure from top hat mounting surface to centre of lower eye bolt. Can be a little tricky when the strut is installed but can be done.

Anything around and over 580mm can cause this issue.

Take a pic of the top hat too. The top hat for that strut may need a deep cup.

Could be as simple as rotating the UCA ball joint as hiluxxury suggests but that CV angle looks excessive
Did you mean measure from top head to centre of this bolt? didn't think of this I will have a look when I get back.

I later realised the driver side uca ball joint was a bit outside than the left so hopefully that should be adjustable.

there's some skinnier cv boots that will have a little bit more clearance around.

seems I have to do research and check everything in detail myself the fitter just can't spot any obvious problem until I tell him. well at least I'm learning [emoji23] Image

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Re: Uca joint touching strut at full drop

Postby hiluxxury on Wed, 07 Aug 2019 3:15 +0000

DB is talking about your maximum droop. Too much droop and your wheel won't rotate due to the CVs binding.

Do a search here for diff drop. It might save you a busted CV.
I might be wrong.

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Re: Uca joint touching strut at full drop

Postby suh4 on Wed, 07 Aug 2019 3:21 +0000

hiluxxury wrote:DB is talking about your maximum droop. Too much droop and your wheel won't rotate due to the CVs binding.

Do a search here for diff drop. It might save you a busted CV.
I have got the phat bar arm style diff drop, on flat ground the angle is good. 2nd photo was on the jack wheel off the ground. I will still check the droop and see how it goes....

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Re: Uca joint touching strut at full drop

Postby suh4 on Wed, 07 Aug 2019 3:32 +0000

hiluxxury wrote:DB is talking about your maximum droop. Too much droop and your wheel won't rotate due to the CVs binding.

Do a search here for diff drop. It might save you a busted CV.
I am also wondering if I change it to 2.5 inch will it do anything with the droop? or the max droop is only the shock travel it won't change by lift height?

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Re: Uca joint touching strut at full drop

Postby hiluxxury on Wed, 07 Aug 2019 4:47 +0000

suh4 wrote:
hiluxxury wrote:DB is talking about your maximum droop. Too much droop and your wheel won't rotate due to the CVs binding.

Do a search here for diff drop. It might save you a busted CV.
I have got the phat bar arm style diff drop, on flat ground the angle is good. 2nd photo was on the jack wheel off the ground. I will still check the droop and see how it goes....

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Oh good. Hopefully you are ok in that respect. The ultimate test though of too much droop is cv binding. The inner CV will be the first to bind. As you rotate the wheel (or not) you may feel the wheel click three times during one rotation. This means you are close to binding as the inner CV (tripod). If your not able to spin the wheel, then you risk popping the tripod at max droop or blowing an outer CV.

What you do about binding is generally a diff drop. Beyond that a limiting strap or... thoughts and prayers for not blowing a CV and carrying spares just in case.
Last edited by hiluxxury on Wed, 07 Aug 2019 7:48 +0000, edited 1 time in total.
I might be wrong.

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Re: Uca joint touching strut at full drop

Postby hiluxxury on Wed, 07 Aug 2019 4:49 +0000

suh4 wrote:
hiluxxury wrote:DB is talking about your maximum droop. Too much droop and your wheel won't rotate due to the CVs binding.

Do a search here for diff drop. It might save you a busted CV.
I am also wondering if I change it to 2.5 inch will it do anything with the droop? or the max droop is only the shock travel it won't change by lift height?

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No.. droop is managed by shock length. Changing ride height won't impact droop.
I might be wrong.

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Re: Uca joint touching strut at full drop

Postby DeadlyBeast on Wed, 07 Aug 2019 7:01 +0000

suh4 wrote:Did you mean measure from top head to centre of this bolt? didn't think of this I will have a look when I get back.
there's some skinnier cv boots that will have a little bit more clearance around.
Image


Measure from the top mounting surface to the middle of that mounting bolt you have circled.
You dont want to mess around with aftermarket CV boots. Its a messy and unnecessary job
Toyota OEM boots are good.

The below images will give you some idea.
I received some billies that were too long at full extension/droop because the wrong top hat was fitted

You will see the top hat on the left (correct top hat sent and fitted after initial shipment) has a deeper cup then that on the right
20190311_092221 (Small).jpg

Jack up one side to get full extension
You will have to thread your tape measure between the UCA and coil and butt it into the strut mount
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Re: Uca joint touching strut at full drop

Postby suh4 on Wed, 07 Aug 2019 7:23 +0000

DeadlyBeast wrote:
suh4 wrote:Did you mean measure from top head to centre of this bolt? didn't think of this I will have a look when I get back.
there's some skinnier cv boots that will have a little bit more clearance around.
Image


Measure from the top mounting surface to the middle of that mounting bolt you have circled.
You dont want to mess around with aftermarket CV boots. Its a messy and unnecessary job
Toyota OEM boots are good.

The below images will give you some idea.
I received some billies that were too long at full extension/droop because the wrong top hat was fitted

You will see the top hat on the left (correct top hat sent and fitted after initial shipment) has a deeper cup then that on the right
20190311_092221 (Small).jpg

Jack up one side to get full extension
You will have to thread your tape measure between the UCA and coil and butt it into the strut mount
yep my top hat is the correct one. will have to do the measurement when I get back, flying out in the morning....

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Re: Uca joint touching strut at full drop

Postby suh4 on Sun, 08 Sep 2019 6:18 +0000

DeadlyBeast wrote:High clearance CV boot?

The 2nd pic looks like your CV is over extended at that angle - does it bind when you try to rotate the wheel?

What is the full extended length of your struts? Measure from top hat mounting surface to centre of lower eye bolt. Can be a little tricky when the strut is installed but can be done.

Anything around and over 580mm can cause this issue.

Take a pic of the top hat too. The top hat for that strut may need a deep cup.

Could be as simple as rotating the UCA ball joint as hiluxxury suggests but that CV angle looks excessive
hi db finally came back from overseas and did the measurement. the top hat to center of bolt is around 580mm if no more (can't measure very accurately with everything installed).

my struts have the correct top hat,
I've got the psr arm style diff drop

is there anything I can do to limit the droop for another couple cm (or if it's necessary at the moment) such as bump stop etc.

with the cv boots rubbing against the strut can it be solve by moving the wheel centre backwards?

many thanks



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Re: Uca joint touching strut at full drop

Postby DeadlyBeast on Sun, 08 Sep 2019 7:32 +0000

I would get in touch with Cal Offroad
580mm is long, your CV angles are nasty given you have a diff drop
Do your wheels rotate without and binding when jacked off the ground?
Send Cal those pics + images of the top hat and model number on the strut

Failing that if you can reduce to 2" lift that should help
Yes - you can get droop limiters and drop stops but these can fail.
Simplest and most reliable solution is to have the correct strut set up
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Re: Uca joint touching strut at full drop

Postby Myralga on Sun, 08 Sep 2019 8:29 +0000

Triple check that the UCA ball joint has been installed correctly.
I have seen a similar issue on a 200 series.
Final answer was the adjustable ball joint was installed back to front pushing everything out of whack.
Miraculously they were still able to get it to align but admitted it was a lot easier when it was the right way.


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Re: Uca joint touching strut at full drop

Postby suh4 on Mon, 09 Sep 2019 3:02 +0000

DeadlyBeast wrote:I would get in touch with Cal Offroad
580mm is long, your CV angles are nasty given you have a diff drop
Do your wheels rotate without and binding when jacked off the ground?
Send Cal those pics + images of the top hat and model number on the strut

Failing that if you can reduce to 2" lift that should help
Yes - you can get droop limiters and drop stops but these can fail.
Simplest and most reliable solution is to have the correct strut set up
https://youtu.be/KfU-NY0XYfg

I think that may be just the cv boots rubbing on the strut? if there's no grinding noise at full droop does that mean the strut is ok?

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Re: Uca joint touching strut at full drop

Postby awill on Sat, 20 Nov 2021 9:28 +0000

Id have to agree with Myralga in regards to the UCA ball joint, you could also get extended ball joints but shouldn't need them with aftermarket UCA's and thats not going to help with the CV boot issue.
Monster rides do lower bump stops which may be an option, but Id just be setting it at 2.5" lift.
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