Anyone know the spring rate (constanst/k-value) of current stock EB front & rear?

[TacoTanium]

Uncompressed length is a plus too.

Or the OEM Ford p/n for the font and rear springs of the EB, should be about to look at the specs on them.

Thanks!

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[ATXTACOS]

This is a very Mustang forum type question. I like it!

 

[The Real Maverick]

I was going to say, this is a very unusual, very specific question.

I know what you are asking but I don't have the answer.

 

[Tim d]

Uncompressed length is a plus too.

Or the OEM Ford p/n for the font and rear springs of the EB, should be about to look at the specs on them.

Thanks!

No,but when I hook up my 3100 lb boat the rear hardly squats.not sure if that helps.

 

[Bwicka]

Fronts are approximately 175 lb, rear about 230 lb , these are tremor rates , so 180-200/240-250 probably pretty close for 4K package

https://www.mavericktruckclub.com/forum/threads/diference-on-hybrid-vs-tremor-struts-fyi.43236/

my post on difference between hybrid and tremor stock with pics of part numbers

 

[TacoTanium]

No,but when I hook up my 3100 lb boat the rear hardly squats.not sure if that helps.

What was the tongue weight?

Fronts are approximately 175 lb, rear about 230 lb , these are tremor rates , so 180-200/240-250 probably pretty close for 4K package

https://www.mavericktruckclub.com/forum/threads/diference-on-hybrid-vs-tremor-struts-fyi.43236/

my post on difference between hybrid and tremor stock with pics of part numbers

How did you know they were 175 & 230?

 

[Bwicka]

Pulled the stock ones and measured 1” collapse at given weight on free spring.
Then used new springs with 175lb on front and 225 lb on rear on flat out shocks and ride is basically same .

 

[TacoTanium]

Pulled the stock ones and measured 1” collapse at given weight on free spring.
Then used new springs with 175lb on front and 225 lb on rear on flat out shocks and ride is basically same .

Good enough to know, thanks. I was planning on adding weight to the bed and measure both rear wheel wells height changes.

 

[Master Blaster]

Uncompressed length is a plus too.

Or the OEM Ford p/n for the font and rear springs of the EB, should be about to look at the specs on them.

Thanks!

You can't ask for a spring rate for a variable-rate spring. You need to see the whole curve. Plus the rears are mounted at an angle to improve the cornering, so you need to know the side-loading curve as well.

 

[TacoTanium]

You can't ask for a spring rate for a variable-rate spring. You need to see the whole curve. Plus the rears are mounted at an angle to improve the cornering, so you need to know the side-loading curve as well.

Good to know that they come with variable-rate springs. That explains how @Bwicka mentioned they ride the similar.

Do both the front and rears have variable spring rates?

 

[TacoTanium]

You can't ask for a spring rate for a variable-rate spring. You need to see the whole curve. Plus the rears are mounted at an angle to improve the cornering, so you need to know the side-loading curve as well.

Good to know that they come with variable-rate springs. That explains how @Bwicka mentioned they ride the similar.

Do both the front and rears have variable spring rates?

The pictures of the springs from post #5 above doesn't look variable rated springs... I think these were his front springs. My rear spring doesn't look to be variable rated springs either.

 

[BCMaverick]

It would be nice to know what the spring rate curves are for FX4/4K stock set up so you could match a set of new moderate lift springs from Eibach or H&R. Seems there is a stock levelling set-up but not one specific to a FX4/4K build.

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