Coilover spring rate - The 1947 - Present Chevrolet & GMC Truck Message Board Network

STOCKISH · 02-27-2014, 11:08 PM

Ok guys, Im ready to order my front coil overs so I can finally move on to finishing the rear of my chassis. For those of you running coil overs what spring rate are you using? I will have the C4 (obviously) front and rear suspension and running a 5.3/4l60e combo.

**oldman3** · 02-28-2014, 12:50 AM

Josh, I think a lot of it has to do with the length of shock and length of spring. On my MII front end which has an 8" coil spring, I'm using a 700# coil spring. This is also what QA1 recommended for my truck, engine, ac, etc....Jim

STOCKISH · 02-28-2014, 12:56 AM

Thanks man, From my reading it looks like 500# springs is what I would use. Hopefully someone with the C4 swap will chime in.

not2oldchevy · 02-28-2014, 07:56 PM

Quote:

Originally Posted by 1972SuperCheyenne

Thanks man, From my reading it looks like 500# springs is what I would use. Hopefully someone with the C4 swap will chime in.

I have a 53 ls c4 with flat out parts I will look and see if the rate is listed anywhere.

STOCKISH · 02-28-2014, 10:30 PM

Thanks man, could use any other specs you have as well. Length extended, compressed, etc... Looking at some Bilsteins Thanks

fabguy · 02-28-2014, 11:46 PM

Between 450 - 500# is what they said I needed for mine. I am using the full rear suspension w/ mono leaf though. Only coil covers in the front

not2oldchevy · 03-01-2014, 08:07 PM

Quote:

Originally Posted by 1972SuperCheyenne

Thanks man, could use any other specs you have as well. Length extended, compressed, etc... Looking at some Bilsteins Thanks

Alden #657/650lb spring rate. Can look up alden part# and get whatever you need. Rides super good.

STOCKISH · 03-01-2014, 10:37 PM

Would love that part # if possible. Didn't think they would be 650#!!

papastrk · 03-02-2014, 04:41 PM

650# should be much closer than the 500# rate you first mentioned. The Vette lower control arm uses a more outboard coilover mounting point than most. This allows a little lower spring rate to be used, but the 500# rate with the stock engine location may be too soft.

STOCKISH · 03-02-2014, 06:16 PM

Sounds great guys. I'll go with the 650# ones if that's what FlatOut is selling. They did the R&D so I'll trust that. Anyone know the extended length, mounted length, and how much travel they have?

not2oldchevy · 03-02-2014, 07:44 PM

Quote:

Originally Posted by 1972SuperCheyenne

Would love that part # if possible. Didn't think they would be 650#!!

Google aldan eagle shocks they have a chart that tells everything.

02-27-2014, 11:08 PM	#1
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Coilover spring rate Ok guys, Im ready to order my front coil overs so I can finally move on to finishing the rear of my chassis. For those of you running coil overs what spring rate are you using? I will have the C4 (obviously) front and rear suspension and running a 5.3/4l60e combo. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

02-28-2014, 12:50 AM	#2
oldman3 Senior Member Join Date: Mar 2011 Location: West Plains, Missouri Posts: 7,557	Re: Coilover spring rate Josh, I think a lot of it has to do with the length of shock and length of spring. On my MII front end which has an 8" coil spring, I'm using a 700# coil spring. This is also what QA1 recommended for my truck, engine, ac, etc....Jim __________________ my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=459839 Jimbo's long bed step build:http://67-72chevytrucks.com/vboard/s...t=464626<br />

02-28-2014, 12:56 AM	#3
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Coilover spring rate Thanks man, From my reading it looks like 500# springs is what I would use. Hopefully someone with the C4 swap will chime in. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

02-28-2014, 10:30 PM	#5
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Coilover spring rate Thanks man, could use any other specs you have as well. Length extended, compressed, etc... Looking at some Bilsteins Thanks __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

03-01-2014, 10:37 PM	#8
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Coilover spring rate Would love that part # if possible. Didn't think they would be 650#!! __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

02-28-2014, 11:46 PM	#6
fabguy Elev8r Man Join Date: Aug 2010 Location: Glendora, CA Posts: 835	Re: Coilover spring rate Between 450 - 500# is what they said I needed for mine. I am using the full rear suspension w/ mono leaf though. Only coil covers in the front __________________ 1955.2 C4 Carry-all / Suburban ---> 55.2 Build Thread!! 1958 Fleetside SWB ---> 58 Fleetside Build thread 1939 2 door sedan *My F.B. project page.*

03-02-2014, 04:41 PM	#9
papastrk Registered User Join Date: Dec 2011 Location: Southern Oklahoma Posts: 181	Re: Coilover spring rate 650# should be much closer than the 500# rate you first mentioned. The Vette lower control arm uses a more outboard coilover mounting point than most. This allows a little lower spring rate to be used, but the 500# rate with the stock engine location may be too soft.

03-02-2014, 06:16 PM	#10
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Coilover spring rate Sounds great guys. I'll go with the 650# ones if that's what FlatOut is selling. They did the R&D so I'll trust that. Anyone know the extended length, mounted length, and how much travel they have? __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.



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