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#1 |
Adam B
Join Date: Jul 2005
Location: Westfield
Posts: 151
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Rear Coil Springs, Knowing when Bad??
I have a 68 C-10 and have just replaced the body bushings and shocks all around. Earlier this year I weight in the back of my truck to handle better in the snow. Now that the weather is better, I have removed the weight, and I am getting a ton of wheel hop.
I am trying to improve the driveability of the truck, but I am wondering if the springs might be shot?? The rear end seems very light and not handles well over bumps at higher speeds 40-60mph. Does anyone have any suggestions? How do you know when the springs need to be replaced? Thanks in advanced. Adam |
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#2 | |||
Union Electrician
Join Date: Feb 2005
Location: Louisville, Ky.
Posts: 3,356
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Re: Rear Coil Springs, Knowing when Bad??
I don't know a whole lot about suspensions,but for around $130 or so I would replace the springs. It isn't that hard to do and I'm sure it would make a vast improvment over the 35-40 year old springs. Just my .02
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#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Rear Coil Springs, Knowing when Bad??
The wheel hop has me scratching my head here.
I would get under there and look at the Trailing arms REAL good. They tend to sud and seperate, and even break in 2 pieces...esp in your (our) neck of the woods. Pay special attention to where the two halfs are joined. There's probably a bunch of rust forcing the metal apart. Also look at the bushings at the front of the trailing arms, and the U bolts on the axle, and may as well look at the pan hard bar too, but that would be another issue all together. In reality, while there is a posability that your springs are bad, I would say it is not probable. |
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#4 |
Got Horsepower?
Join Date: Sep 2003
Location: IDAHO
Posts: 406
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Re: Rear Coil Springs, Knowing when Bad??
my guess would be that your shocks are shot. with bad shocks the coil backends can act like that.
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2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers |
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Rear Coil Springs, Knowing when Bad??
a good pair of shock absorbers should also be added to the list
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#6 | |||
Union Electrician
Join Date: Feb 2005
Location: Louisville, Ky.
Posts: 3,356
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Re: Rear Coil Springs, Knowing when Bad??
He said in the first post he has replaced the shocks all the way around.
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#7 |
Adam B
Join Date: Jul 2005
Location: Westfield
Posts: 151
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Re: Rear Coil Springs, Knowing when Bad??
I know its not the shocks, I have replaced with brand new shock in the front and rear.
The odd thing is that it didn't do this when I had the extra weight in the rear. Once I removed this, the back end feels very light and likes to bounce. |
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#8 |
Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Wheel hop is generally defined as a result of axle wrap under grippy tire traction until until the suspension springs won't bend anymore and the springs overcome the traction coefficient of the tires and everything lets loose. Like LonghornMan implied, wheel hop is more of a leaf spring thing, not coil spring with rigid axle-locating trailing arms.
Bounce is generally defined as a strict up and down motion with no axle wrap. Which behavior does your truck exhibit?
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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#9 |
Adam B
Join Date: Jul 2005
Location: Westfield
Posts: 151
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Re: Rear Coil Springs, Knowing when Bad??
It is definately axel bounce in that case. It only happens when the truck bed has no load on it either. When it has weight in the rear, you don't feel the bounce.
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#10 |
Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Re: Rear Coil Springs, Knowing when Bad??
OK. If you placed heavy weight in the truck after you installed shocks, I can just about guarantee that the lower stance of the weighed down truck punched out the shock inside. Before throwing anymore $$ at it, pull one of the rear shocks and check if it still dampens.
As far as the springs go, if they're bad, you'll see abnormal bends in the spring windings and/or the truck will usually sag in comparison to the front since the front never had an extra load like the rear cargo area of the truck. I'm replacing the undamaged, but tired coils all around on a '72 C10 burb. I discovered while researching what coils to use that *cargo coils* are now available for the rear. They compress the first few articulation inches like stock coils for a good ride, but have closer windings that come into play nearer full compression to handle loads better. A good upgrade over OEM.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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#11 |
It's a catastrophic success.
![]() Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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Re: Rear Coil Springs, Knowing when Bad??
Sounds like a knot or an out of balanced tire.
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#12 | |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Rear Coil Springs, Knowing when Bad??
Quote:
Most coil spring trucks have that set up stock. |
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