MII spring rates - The 1947 - Present Chevrolet & GMC Truck Message Board Network

scotterdog · 12-30-2010, 10:04 PM

Hi all, we are getting ready to order the parts to put a MII ifs under our 53 and im hoping you all could give me some advice on choosing what spring rate we need. the truck has all its stock sheet metal with a 305/th400 combo, if that helps.
thanks,
scott

weldvair@embarqmail. · 12-31-2010, 11:10 AM

I use 4 cyl springs with one coil cut. This seems to be what most shops do.

Don

.............after reading my post...........I meant to say with 1/2 of a coil, not 1 coil cut.

mr48chev · 12-31-2010, 12:31 PM

A lot of guys tend to want to put too high of rating of springs in and ruin the ride they are looking for.
As Weldvair said, the 4 cylinder springs seem to work quite well in most instances.

Atomsplitter · 12-31-2010, 05:41 PM

While your looking at spring rates also look into a sway bar if the kit doesn't already come with one. It, along with the correct springs, will give a much nicer ride and cornering.

scotterdog · 12-31-2010, 11:09 PM

Thanks guys! we are getting a parts kit from speedway motors and gonna use a chassis enginering bolt in crossmember. the tech guy at speedway said we would be happy with a 375lb spring and thats just a bit on the stiff side of medium. all you and a truck guy my wife works with are saying softer, so i think im gonna go with springs a few steps softer than the 375lb ones.
thanks again!
scott

52 Rat · 01-01-2011, 10:45 AM

Quote:

Originally Posted by scotterdog

Thanks guys! we are getting a parts kit from speedway motors and gonna use a chassis enginering bolt in crossmember. the tech guy at speedway said we would be happy with a 375lb spring and thats just a bit on the stiff side of medium. all you and a truck guy my wife works with are saying softer, so i think im gonna go with springs a few steps softer than the 375lb ones.
thanks again!
scott

I went with the 350# spring. I have the Heidts kit. I have a rather heavy engine with the lq4 6.0L.

weldvair@embarqmail. · 01-01-2011, 10:50 AM

I have used the must II IFS over 10 times & experimented with many springs
........do not use anything but 4 cyl springs with 1/2 coil removed.

Don-Mech Engr

scotterdog · 01-01-2011, 12:53 PM

Hey Don, do you know how many pounds the spring rate is on those 4 cyl springs? dig your truck!
thanks,
scott

12-30-2010, 10:04 PM	#1
scotterdog Registered User Join Date: May 2010 Location: lompoc, ca Posts: 4	MII spring rates Hi all, we are getting ready to order the parts to put a MII ifs under our 53 and im hoping you all could give me some advice on choosing what spring rate we need. the truck has all its stock sheet metal with a 305/th400 combo, if that helps. thanks, scott

12-31-2010, 11:10 AM	#2
weldvair@embarqmail. Registered User Join Date: Feb 2008 Location: st cloud, fl Posts: 266	Re: MII spring rates I use 4 cyl springs with one coil cut. This seems to be what most shops do. Don .............after reading my post...........I meant to say with 1/2 of a coil, not 1 coil cut. Attached Images Last edited by weldvair@embarqmail.; 12-31-2010 at 03:38 PM. Reason: fix

12-31-2010, 12:31 PM	#3
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,410	Re: MII spring rates A lot of guys tend to want to put too high of rating of springs in and ruin the ride they are looking for. As Weldvair said, the 4 cylinder springs seem to work quite well in most instances.

12-31-2010, 05:41 PM	#4
Atomsplitter Registered User Join Date: Mar 2006 Location: Ontario Posts: 514	Re: MII spring rates While your looking at spring rates also look into a sway bar if the kit doesn't already come with one. It, along with the correct springs, will give a much nicer ride and cornering.

12-31-2010, 11:09 PM	#5
scotterdog Registered User Join Date: May 2010 Location: lompoc, ca Posts: 4	Re: MII spring rates Thanks guys! we are getting a parts kit from speedway motors and gonna use a chassis enginering bolt in crossmember. the tech guy at speedway said we would be happy with a 375lb spring and thats just a bit on the stiff side of medium. all you and a truck guy my wife works with are saying softer, so i think im gonna go with springs a few steps softer than the 375lb ones. thanks again! scott

01-01-2011, 10:50 AM	#7
weldvair@embarqmail. Registered User Join Date: Feb 2008 Location: st cloud, fl Posts: 266	Re: MII spring rates I have used the must II IFS over 10 times & experimented with many springs ........do not use anything but 4 cyl springs with 1/2 coil removed. Don-Mech Engr

01-01-2011, 12:53 PM	#8
scotterdog Registered User Join Date: May 2010 Location: lompoc, ca Posts: 4	Re: MII spring rates Hey Don, do you know how many pounds the spring rate is on those 4 cyl springs? dig your truck! thanks, scott



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