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Old 06-20-2018, 09:43 AM   #1
bpope
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To Cup or not to Cup

Hello,

I currently have my '65 short step torn apart awaiting my airride kit (getting delivered today). It is a BC Fab Level 3 kit (which come plates for top of bag and bag cups for bottom). My truck currently has 2.5" drop spindles but, I cannot decide on whether or not to cup the LCA's. I by no means want to lay frame. I like them low, but I like a stance. I'm just concerned it might not be low enough with the bags sitting in the stock springs pockets. I have also read that cupping them allows for a little better ride at ride height? Attached is a pic of my truck with the static drop...can anyone let me know about where it will sit in the front with the 2.5" drop spindles and bags sitting in stock LCA spring pockets? Will it get much lower than what it already is? I don't really want to trim inner fender wells and the tires are 205/75/15. Thanks!
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Last edited by bpope; 06-20-2018 at 02:18 PM.
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Old 06-20-2018, 02:04 PM   #2
bpope
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Re: To Cup or not to Cup

If it sat this low in the front with the setup I have...I would be happy.
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Old 06-28-2018, 12:42 PM   #3
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Re: To Cup or not to Cup

Giving an update here. Well, I got the bags bolted on and jacked the LCA as far as it would go and it really doesn't seem low enough. I don't really get it as seeing pics of other trucks with the same setup, they seem way lower. I have a pic of another truck (Malibobs) that has the exact same setup as mine - but mine doesn't look near that low. Would it get lower with the weight of the truck on it? Doesn't seem like it would. Any help would be greatly appreciated. The lower cup mount that came with the kit is 1-7/8" tall (BC Fab Kit). I would want it to ride at the height of my pics attached...not when it is aired out. Bags are Dominator 2600's. I have 1-1/2" before the top of the tire hits the inner fender well (as it is pictured here - have not put the truck on the ground yet, just jacked up the LCA as far as it would go.) Tires are 215/75/15.
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Old 06-29-2018, 01:51 PM   #4
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Re: To Cup or not to Cup

I cant help on the actual height questions.

The bags are designed to be used at the height they are when there is no pressure applied. By cupping them you can both improve the ride while having a lower ride height as well as air out lower.

If you want to see how low it will be when you cup it you can take the bag out and jack the wheel up to whatever height you want. You will eventually run into the inner fenders (as you mentioned) as well as the steering shaft too.
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Old 06-29-2018, 03:26 PM   #5
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Re: To Cup or not to Cup

Do you have the bag hooked to the valve or the shipping plug in the bag when you are raising the lower arm? The air naturally in the bag could still be compressing and not letting it fully deflate.

The shocks could be stopping its travel or it could also be the ball joints binding.

With just cups, 2600 bags and plates my 78 puts the a-arms about 1/4" off the ground. I know the trucks are different but the suspension design is basically the same.
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Old 07-01-2018, 11:33 AM   #6
bpope
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Re: To Cup or not to Cup

Quote:
Originally Posted by bluex View Post
Do you have the bag hooked to the valve or the shipping plug in the bag when you are raising the lower arm? The air naturally in the bag could still be compressing and not letting it fully deflate.

The shocks could be stopping its travel or it could also be the ball joints binding.

With just cups, 2600 bags and plates my 78 puts the a-arms about 1/4" off the ground. I know the trucks are different but the suspension design is basically the same.
Bags did not have the plug in them, just the air line fitting not hooked to anything. Shocks were unhooked, but i agree it could be binding the ball joint. So your lower control arms are stock? Not cupped for a recessed bag?
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Old 07-01-2018, 01:22 PM   #7
bpope
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Re: To Cup or not to Cup

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Originally Posted by tinydb84 View Post
I cant help on the actual height questions.

The bags are designed to be used at the height they are when there is no pressure applied. By cupping them you can both improve the ride while having a lower ride height as well as air out lower.

If you want to see how low it will be when you cup it you can take the bag out and jack the wheel up to whatever height you want. You will eventually run into the inner fenders (as you mentioned) as well as the steering shaft too.
Thanks for the info! Im going to have them cupped this week. Today i will play around with it with no bags in to see how much lower it goes.
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Old 07-02-2018, 06:36 PM   #8
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Re: To Cup or not to Cup

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Bags did not have the plug in them, just the air line fitting not hooked to anything. Shocks were unhooked, but i agree it could be binding the ball joint. So your lower control arms are stock? Not cupped for a recessed bag?
Ya they are stock, just removed the bump stop and its bracket, moog problem solver ball joints and poly bushings.
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Old 07-03-2018, 11:42 AM   #9
bpope
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Re: To Cup or not to Cup

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Ya they are stock, just removed the bump stop and its bracket, moog problem solver ball joints and poly bushings.
Cool. Thanks for the info. I took the bags out and am having the LCA's cupped. This will be as low as it will go since the tires are bottoming out on the inner fender well and this will be low enough for me!
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Old 07-03-2018, 12:19 PM   #10
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Re: To Cup or not to Cup

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low enough for me!
That's what we all say...
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Old 07-03-2018, 12:39 PM   #11
bpope
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Re: To Cup or not to Cup

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That's what we all say...
LOL, I know. Every other truck I have lowered could have always been just a little more.
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Old 07-04-2018, 08:11 AM   #12
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Re: To Cup or not to Cup

I have the stuff to cup mine but I haven't done it just yet. I mainly want to do it so the bag is positively located at the bottom. My cups move around sometimes, mainly if I air it out on unlevel ground. Then I wind up with uneven pressures to get my ride height and the ride quality suffers as well.
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Old 07-05-2018, 11:27 AM   #13
bpope
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Re: To Cup or not to Cup

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Originally Posted by bluex View Post
I have the stuff to cup mine but I haven't done it just yet. I mainly want to do it so the bag is positively located at the bottom. My cups move around sometimes, mainly if I air it out on unlevel ground. Then I wind up with uneven pressures to get my ride height and the ride quality suffers as well.
That's pretty interesting. I do like the idea that I will be able to bolt the bottom one in now, once they are cupped.
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