SPC UCA

For you guys with SPC uppers, how much more caster did you get? I currently just installed Icon tubular Delta Joint UCAs and they have my tire pushed back too far with full positive caster set on the LCA.
I just ordered SPCs and I’m hoping that they will do the job.

It sucks about buying expensive Icon UCAs and not being able to use them. They were recommended to me by the people I got all my suspension setup from.
They did give me 15% off of the new SPCs because they were the ones who recommended the Icons for my specific setup.......

 

What do you mean by your tire is pushed back too far? Is your caster within spec right now? And what size tire are you running and what are you trying to achieve with the change in UCA?

 

Tires are 33” and alignment is within factory specs. Aftermarket UCAs for lifted trucks usually have +2 castor built in to improve alignment and droop. Having +2 castor at the UCA pushes the tire back in to the rear fender. Adjustable UCAs allow you to make changes to gain back that castor to push the tire forward for clearance.
+ castor at the top pushes the tire back. + castor at the bottom pushes the tire forward.
I’m trying to get feedback from those that have an adjustable UCA to see how much more forward castor they were able to achieve after installing adjustable UCAs.

 

I put my uppers 1 notch forward, sorry can't remember the letter designation, & my lowers to full caster for max tire clearance. I barely clear 34's but hey do clear

 

So you put both cam bolts, front and back in the opposite direction to gain the most castor and then adjusted the UCA to do all of the alignment for camber and castor? What were your castor number?

 

Yes lowers at max castor. I think my castor was 2.8-2.9, I don't really remember. the steering is a little quick, but its the trade off I've made for fitting my tires without cutting

 

So if the uppers you have, have built in caster let’s say 2 degrees you will still need to set your caster above factory numbers not to rub. IE. I have JBAs with 2* built in caster and have 4.5 degrees of caster as an example.

 

Yep, that’s why I made this thread. Mine won’t go up that far.

 

Do you know what order you alignment guy made the adjustments? Should be caster, camber, toe.

 

It’s all good man, I appreciate it. I’m way past that point. I’m just trying to get a response from the SPC guys on their additional caster after install

 

Your problem is in the first sentence. You can't align to factory specs. Your castor should be in the 3.0 range camber and toe at 0.

 

It wasn’t aligned “to” factory specs. The alignment after full caster was achieved happened to be “within” factory recommended specs.
I am absolutely getting the maximum caster I can with these non-adjustable UCAs. It’s been verified by 2 other alignment shops, AccuTune Offroad, SPC, and myself also looking at the cam bolts.
The only thing left is for me to install adjustable UCAs.
I appreciate the response. But again, I’m not asking any questions about my caster alignment. I’m asking how much additional caster adjustable UCAs were achieved by those who have them installed.

 

I've have had them installed for 8 years. Believe I know how to get my 33's to not rub against the back. +2 on the SPC's and alignment at 3,0,0.

 

i have tube SPCs and have the them through several alignments over the past 3 years. i went as high as 5.9° driver & 6.2° passenger, and as low as mid 3's. I've been at 4 for the last year but am on the rack right now with new parts tweaks and stuff to get it settled right at 5°even both sides. I've seen folks align them in higher caster as well. look in the street truck forum. my truck is not a street truck though.

 

Ok, so +2 and you are good. Thanks! I’m trying to adjust the least caster on top as possible to keep good driving and steering.
My plan is to crank the bottom cam bolts to achieve max caster and then use the UCA to complete the caster and camber alignment.

 

What is your tire size? I’m going to check out that thread now. Thanks

 

I think what a lot of us are trying to say is, there are to many guys that that have used non adjustable ucas, that have built in caster and have achieved 3-5* degrees of caster. Most ucas with built in caster build in 2* and getting 4 * should not be an issue unless there is a suspension issue or the alignment guys are as good as they say. Good luck and keep us posted.

 

So setting the spc uca at +2 is no different than having a uca with fixed +2.

 

Yeah I know. I’m not able to get that much caster. There’s nothing wrong with the suspension. The only possibility is that these Icon UCAs have more caster built in than they should. I doubt that though. I’m sure these SPCs will do the trick. It just really stings to buy a new set when these Icons have only about 150 miles on them.

 

SPC is allredy set at +2* at the standard 'D' setting... if you add +2* to the SPC you are then at +4* caster.

Can get into the +6* range then.