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#1 |
Registered User
Join Date: Sep 2012
Location: Lees Summit Mo
Posts: 15
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I have a 72 GMC shortbed. I installed new 5" coil drop springs from LMC. They ride pretty well but the rear end is very spongy & I cannot put much weight in the back. Has anyone else had this problem? If so, what did you do to fix it? POL springs (Performance Online), Belltech, Hotchkis, these are all double the price. Is it because they are progressive springs & the LMC one are not progressive? or has anyone installed the airbag helper springs? If so, how do you like them & how did it change the ride? thank you for the help.
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#2 |
Registered User
![]() Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: Rear Spring Comparison
Given the 5" drop....it sounds like you bought and installed springs designed for looks and not load....so that is just the lay of the land at the moment.
Adding Airbags would give you the options on perhaps performing both functions. All good Coley
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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#3 |
Registered User
Join Date: Sep 2012
Location: Lees Summit Mo
Posts: 15
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Re: Rear Spring Comparison
Thanks, I was curious if the springs from lmc are progressive, I wondered if that would fix it. what springs are you running?
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#4 |
Registered User
Join Date: Jun 2012
Location: Clearwater Beach Florida
Posts: 872
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Re: Rear Spring Comparison
What do you have regarding springs? Did you replace them?
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#5 |
Registered User
![]() Join Date: Apr 2007
Location: Foster Rhode Island
Posts: 1,176
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Re: Rear Spring Comparison
Generally a progressive spring will have larger spaces in the loops near the bottom and get progressively closer near the top. That way the wide spaces close up first and the tighter coils carry more weight as the spring loads up. If the loops all look evenly spaced then the most likely are not progressive.
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#6 |
Registered User
Join Date: Sep 2012
Location: Lees Summit Mo
Posts: 15
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Re: Rear Spring Comparison
Thank you Old Chevy Guy. I will take another look at them, i believe i will try the air bag HELPER spring from the Airlift company. If i dont like that maybe go with the Hotchkis springs. if i dont like the ride etc. at that point, i guess i can look into bagging the rear.
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#7 |
Registered User
Join Date: Jun 2012
Location: Clearwater Beach Florida
Posts: 872
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Re: Rear Spring Comparison
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#8 |
Registered User
Join Date: Sep 2012
Location: Lees Summit Mo
Posts: 15
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Re: Rear Spring Comparison
Sorry for the delay guys. yes new springs are from Lmc, the number ON the Spring itself is RC603-4 which is a CPP spring. I looked it up it should be a 4" drop spring. very soft. I did install new shocks at the time i installed the new springs. they are however NOT lowering shocks. Just a good brand shock. How important is a lowering shock? And or a shock relocator kit??
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#9 |
Registered User
Join Date: Sep 2012
Location: Lees Summit Mo
Posts: 15
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Re: Rear Spring Comparison
I also just Finished installing air "HELPER" bags today by Airlift 1000. its a universal kit so i did have to drill a hole at the top of frame by the bolt to feed the airline in. Not sure im gonna like this yet because by the time i get enough air into the bag to make it ride better it lifts the truck. So, will update after i get a few miles on this and see if i can find a happy medium. ( could drop it back down an inch with a lowering block)
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#10 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,700
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Re: Rear Spring Comparison
Personally I would run an air bag without the spring.
Use a 2500 or 2600 series bag with no top bracket. Then add a 1.5" or 2" lowering block to help keep the ride height low. But you also need rear shock relocators an adjustable pan hard bar and quality drop shocks.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#11 |
Registered User
Join Date: Apr 2012
Location: Ocala,Fl
Posts: 733
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Re: Rear Spring Comparison
Summit carries the CPP spring made for a real truck, lowered but rides and carries a load without need for helper stuff.
Part # 603-4HD for a 4" drop |
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#12 | |
Registered User
![]() Join Date: Feb 2004
Location: brownfield texas (west texas)
Posts: 1,936
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Re: Rear Spring Comparison
Quote:
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The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS |
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#13 |
Registered User
Join Date: Sep 2012
Location: Lees Summit Mo
Posts: 15
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Re: Rear Spring Comparison
Thank you guys. I will look into the summit springs. if i go with the bags, What brand of bags do you like to use??
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#14 |
Registered User
![]() Join Date: Feb 2004
Location: brownfield texas (west texas)
Posts: 1,936
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Re: Rear Spring Comparison
Dominator 2600. Air lift!
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The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS |
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#15 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,700
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Re: Rear Spring Comparison
Slam Specialties re-7 or ss-7
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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air bags, helper bags, springs comparison |
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