How much to cut cups? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AirMale · 07-31-2009, 08:53 AM

My truck is an 86 and I have the S.D. cups. I've searched and see varying opinions on cup heights between 1-1.5". I'm running a sway bar too. Just wanna run some schrader valves to keep it simple. Thanx

Frizzle Fry · 07-31-2009, 11:20 PM

My understanding is that you can go to 1.5" on 67-72 arms and down to 0.75" on 73-87 arms. I have no exp with the 73-87 arms though. 1.5" cups are perfect for my '72 arms.

AirMale · 08-01-2009, 11:09 AM

anyone with a 73-87 please advise me. I have 2 1/2 drop spindles too.

**N2TRUX** · 08-01-2009, 12:03 PM

I don't know the correct answer, but I am curious why you are cutting them?

blime81 · 08-01-2009, 02:55 PM

Quote:

Originally Posted by N2TRUX

I don't know the correct answer, but I am curious why you are cutting them?

Probably to get a bit lower when aired out.

justpball · 08-01-2009, 03:06 PM

i need this info too...

Frizzle Fry · 08-01-2009, 10:05 PM

Quote:

Originally Posted by blime81

Probably to get a bit lower when aired out.

Yep, 1" at the bag/cup or spring equates to about 2" in drop.

**kev2809** · 08-02-2009, 02:28 PM

is this true for the 67-72 trucks too?

**N2TRUX** · 08-02-2009, 03:38 PM

I "understand" that cutting the cups allows you to go lower. Does it allow you to run more air at a lower ride height?

On my 82 Blazer with 3" spindles and standard cups, the limiting factor was the A-arms hitting the ground.

Ok, school me on this guys.

AirMale · 08-02-2009, 07:19 PM

The cups S.D. sent are 2.5 inches high..... I had a feeling that was too much. I have a 2.5" drop spring in there right now and it's to harsh. I like the stance but was hoping for an improved ride. I'm still not clear on what the ideal cup height should be. If I can't get a solid answer, I'll probably try 1.25 and go from there.

ksbrktracer · 08-02-2009, 08:31 PM

If I understand correctly, The shorter the cups, The more air you can run in the bags, The better the ride........???? Correct......????

baggedcten · 08-02-2009, 09:54 PM

Quote:

Originally Posted by AirMale

The cups S.D. sent are 2.5 inches high..... I had a feeling that was too much. I have a 2.5" drop spring in there right now and it's to harsh. I like the stance but was hoping for an improved ride. I'm still not clear on what the ideal cup height should be. If I can't get a solid answer, I'll probably try 1.25 and go from there.

thats what i did on my 86 but i have 3 inch drop spindles lays control arms

justpball · 08-03-2009, 08:46 AM

so you cut it down to 1.25 and you can lay control arm?

AirMale · 08-03-2009, 09:08 AM

I wish I knew for sure, but no one has confirmed this so I have to start somewhere

justpball · 08-03-2009, 09:23 AM

cool bro, keep me posted please

justpball · 08-03-2009, 09:27 AM

Quote:

Originally Posted by ksbrktracer

If I understand correctly, The shorter the cups, The more air you can run in the bags, The better the ride........???? Correct......????

no thats not it the less air you run the softer the ride, just has to do with how low it will go when aired out...

Frizzle Fry · 08-04-2009, 01:06 AM

Quote:

Originally Posted by justpball

no thats not it the less air you run the softer the ride, just has to do with how low it will go when aired out...

Actually there is a range in which a bag will give the best ride. Pressure/bag-height too low=crappy ride & pressure/bag-height too high=crappy ride. Other factors like selecting the right bag for the application also come into play. In general, with the right bag for the application shorter cups allows you to ride lower and still be in the "sweet spot." ...and obviously air out lower.

justpball · 08-04-2009, 07:18 AM

Thanks for schooling me mike...LOL. does the sweet spot depend on the bag or is there a pressure we should be shooting for? I have 2600 dominators.

**kev2809** · 08-04-2009, 08:39 AM

I got the same sd cups, so I would mine down too for more of a lower drop? 67 suburban

Frizzle Fry · 08-04-2009, 02:03 PM

Quote:

Originally Posted by justpball

Thanks for schooling me mike...LOL. does the sweet spot depend on the bag or is there a pressure we should be shooting for? I have 2600 dominators.

Every bag has an optimal operating range or "design height," as Air Lift calls it, that is the about mid height +/- X". The 2600's range is 2.8"-12.5" but the design height is 6'-9".

Linkage here

Quote:

Originally Posted by kev2809

I got the same sd cups, so I would mine down too for more of a lower drop? 67 suburban

Yes. 1.5" total cup height works well for 67-72 arms.

justpball · 08-04-2009, 02:29 PM

Cool thanks again mike!

northeimcustom · 08-04-2009, 07:12 PM

how bout 73-87 arms??

**kev2809** · 08-04-2009, 08:38 PM

according to this very thread yes the 73-87 arms too. the guy who started the thread has an 86....

Frizzle Fry · 08-04-2009, 10:39 PM

I've read guys say they can cut more off the cups when using 73-87 arms. Maybe someone can confirm to clear this up once and for all...

**kev2809** · 08-05-2009, 05:44 AM

what happens if u would cut it down to like an inch or even less?

07-31-2009, 08:53 AM	#1
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	How much to cut cups? My truck is an 86 and I have the S.D. cups. I've searched and see varying opinions on cup heights between 1-1.5". I'm running a sway bar too. Just wanna run some schrader valves to keep it simple. Thanx __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

07-31-2009, 11:20 PM	#2
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	Re: How much to cut cups? My understanding is that you can go to 1.5" on 67-72 arms and down to 0.75" on 73-87 arms. I have no exp with the 73-87 arms though. 1.5" cups are perfect for my '72 arms.

08-01-2009, 11:09 AM	#3
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Re: How much to cut cups? anyone with a 73-87 please advise me. I have 2 1/2 drop spindles too. __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

08-01-2009, 12:03 PM	#4
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: How much to cut cups? I don't know the correct answer, but I am curious why you are cutting them? __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

08-01-2009, 03:06 PM	#6
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Re: How much to cut cups? i need this info too... __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055

08-02-2009, 02:28 PM	#8
kev2809 low n' slo Join Date: Mar 2009 Location: rosenberg, texas Posts: 5,142	Re: How much to cut cups? is this true for the 67-72 trucks too?

08-02-2009, 03:38 PM	#9
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: How much to cut cups? I "understand" that cutting the cups allows you to go lower. Does it allow you to run more air at a lower ride height? On my 82 Blazer with 3" spindles and standard cups, the limiting factor was the A-arms hitting the ground. Ok, school me on this guys. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

08-02-2009, 07:19 PM	#10
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Re: How much to cut cups? The cups S.D. sent are 2.5 inches high..... I had a feeling that was too much. I have a 2.5" drop spring in there right now and it's to harsh. I like the stance but was hoping for an improved ride. I'm still not clear on what the ideal cup height should be. If I can't get a solid answer, I'll probably try 1.25 and go from there. __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

08-02-2009, 08:31 PM	#11
ksbrktracer TNT-MOTORSPORTS Join Date: Mar 2008 Location: TULSA OKLAHOMA Posts: 2,692	Re: How much to cut cups? If I understand correctly, The shorter the cups, The more air you can run in the bags, The better the ride........???? Correct......???? Last edited by ksbrktracer; 08-02-2009 at 08:31 PM.

08-03-2009, 08:46 AM	#13
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Re: How much to cut cups? so you cut it down to 1.25 and you can lay control arm? __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055

08-03-2009, 09:08 AM	#14
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Re: How much to cut cups? I wish I knew for sure, but no one has confirmed this so I have to start somewhere __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

08-03-2009, 09:23 AM	#15
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Re: How much to cut cups? cool bro, keep me posted please __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055

08-04-2009, 07:18 AM	#18
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Re: How much to cut cups? Thanks for schooling me mike...LOL. does the sweet spot depend on the bag or is there a pressure we should be shooting for? I have 2600 dominators. __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055

08-04-2009, 08:39 AM	#19
kev2809 low n' slo Join Date: Mar 2009 Location: rosenberg, texas Posts: 5,142	Re: How much to cut cups? I got the same sd cups, so I would mine down too for more of a lower drop? 67 suburban

08-04-2009, 02:29 PM	#21
justpball Registered User Join Date: Dec 2008 Location: Silverhill, Al Posts: 2,026	Re: How much to cut cups? Cool thanks again mike! __________________ Fuzzy Dice Club Member 87 Crew SWB Build for the crew http://67-72chevytrucks.com/vboard/s...d.php?t=430082 http://www.cardomain.com/ride/3232925 90 burb 2wd Build Thread For The Burb! http://67-72chevytrucks.com/vboard/s...d.php?t=383055



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08-04-2009, 07:12 PM	#22
northeimcustom Registered User Join Date: Feb 2007 Location: WISCONSIN Posts: 291	Re: How much to cut cups? how bout 73-87 arms??

08-04-2009, 08:38 PM	#23
kev2809 low n' slo Join Date: Mar 2009 Location: rosenberg, texas Posts: 5,142	Re: How much to cut cups? according to this very thread yes the 73-87 arms too. the guy who started the thread has an 86.... Last edited by kev2809; 08-04-2009 at 08:38 PM.

08-04-2009, 10:39 PM	#24
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	Re: How much to cut cups? I've read guys say they can cut more off the cups when using 73-87 arms. Maybe someone can confirm to clear this up once and for all...

08-05-2009, 05:44 AM	#25
kev2809 low n' slo Join Date: Mar 2009 Location: rosenberg, texas Posts: 5,142	Re: How much to cut cups? what happens if u would cut it down to like an inch or even less?

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