What spring is this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldCreek · 10-19-2007, 01:35 AM

Ok, I've got what I understand are 1 ton springs with helpers. They are 2.5 inches wide. Unsprung: Eye to eye 54". Front eye to center 26". Center to rear eye is 30". Are these 56" springs?

How do I recenter these on a frame originally set with 52" springs? Split the difference OR set the front in the stock position and end up moving the rear towards the end of the frame.

Blazer1970 · 10-19-2007, 06:54 AM

The tire has to stay centered close to the same in the wheel opening, so it depends on where the locating pin is in the springs.

cobinder · 10-19-2007, 09:41 AM

As Blazer said, the distance from the front mount to the centering pin is what locates your wheels in the opening. If you measure that on your truck now and measure the new springs that will give the info you need to determine if you need move the front mount. With a larger arch the front pin distance actually needs to lengthen slightly to keep the wheels in the same position.

Keep in mind you want the rear shackle to be close to vertical to allow the spring to "straighten out" when compressed.

Why are you wanting to change the springs you have?

OldCreek · 10-19-2007, 01:07 PM

Sorry about the limited info.

I'm building a 'new' truck from the frame up. I have to bolt on the front and rear hangers for the rear springs. The frame is a 68 1 ton (2wd, 157" wheelbase) with no arch for the rear axle .... it runs straight back so some liberty with axle placement is noted. (depending on fleetside bed placement) Now that I think about it, I have to keep it relatively centered so that the overrider springs will match up to the frame stops. (But, there may be some wiggle room. Dang, I hate forgetting some of the details!)

(Converting the front to 4wd)

10-19-2007, 01:35 AM	#1
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	What spring is this? Ok, I've got what I understand are 1 ton springs with helpers. They are 2.5 inches wide. Unsprung: Eye to eye 54". Front eye to center 26". Center to rear eye is 30". Are these 56" springs? How do I recenter these on a frame originally set with 52" springs? Split the difference OR set the front in the stock position and end up moving the rear towards the end of the frame. __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

10-19-2007, 06:54 AM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	Re: What spring is this? The tire has to stay centered close to the same in the wheel opening, so it depends on where the locating pin is in the springs. __________________ Tim

10-19-2007, 09:41 AM	#3
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	Re: What spring is this? As Blazer said, the distance from the front mount to the centering pin is what locates your wheels in the opening. If you measure that on your truck now and measure the new springs that will give the info you need to determine if you need move the front mount. With a larger arch the front pin distance actually needs to lengthen slightly to keep the wheels in the same position. Keep in mind you want the rear shackle to be close to vertical to allow the spring to "straighten out" when compressed. Why are you wanting to change the springs you have? __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome Last edited by cobinder; 10-19-2007 at 09:46 AM.

10-19-2007, 01:07 PM	#4
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: What spring is this? Sorry about the limited info. I'm building a 'new' truck from the frame up. I have to bolt on the front and rear hangers for the rear springs. The frame is a 68 1 ton (2wd, 157" wheelbase) with no arch for the rear axle .... it runs straight back so some liberty with axle placement is noted. (depending on fleetside bed placement) Now that I think about it, I have to keep it relatively centered so that the overrider springs will match up to the frame stops. (But, there may be some wiggle room. Dang, I hate forgetting some of the details!) (Converting the front to 4wd) __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

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