Yep, another leaf spring question thread...

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Feb 24, 2011 | 08:52 PM

alstaregixxer

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Joined: Dec 2004

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From: Ontario,Canada

Yep, another leaf spring question thread...

I've searched here, plowsite.com, powerstroke.org, and several other F-series enthusiast site with no clear answer to my question.

Are there more than one X code spring? For example; Is there an x code for 5.4 equipped trucks and on for v-10, diesel truck, or is it a one size fits all deal?

I just bought a set of X codes from a 5.4 truck, and want to install them in my diesel. My thinking is that there is only one x code, and it fits all applications. Correct?

Feb 24, 2011 | 09:02 PM

bigblue61

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From: Taxachusetts

Only one, you are correct

Feb 24, 2011 | 09:06 PM

alstaregixxer

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From: Ontario,Canada

Thanks, just wanted a 2nd opinion before i tear into it.

Feb 24, 2011 | 10:03 PM

bigblue61

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From: Taxachusetts

ha good luck and post some pics, I'm thinking about making the swap

Feb 24, 2011 | 10:42 PM

99f350sd

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Joined: May 2003

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From: Lyndonville, Vermont

They will work great..

Feb 25, 2011 | 12:16 AM

78bigbronco

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From: Central Ohio

I've always been a bit foggy on the whole 'X-code' thing. What exactly are they? If X-code designates the highest # springs available (6,000#) then according to the datasheets they were not available on all models. For example the snow plow prep package would have the 6000# rating on a CC LB 5.4 but drop to a SC or SB and the snow plow prep is 5600#. So I'm not 100% sure what the X code designates. I am sure this has been explained before but I may have missed it, in which case I'd appreciate being brought up to speed

Feb 25, 2011 | 02:24 AM

bigblue61

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Joined: Apr 2010

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From: Taxachusetts

Your right on they are the highest rated springs available for 99-04 super duty trucks, they came standard on 450-550s and are on some plow preps

Heres my GUESS about some of the differences you mentioned

CC have more weight over the front axle because they are heavier than reg cabs and ex cabs (obviously) therefore requiring a higher spring capacity, hence the x codes. So for an reg/ext cab less spring is required which results in an improved ride. The CC weighs more needs a higher spring rating.

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Feb 25, 2011 | 03:09 AM

78bigbronco

Fleet Mechanic

Joined: Jan 2003

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From: Central Ohio

Quote:

Originally Posted by bigblue61

Yes I understand the differing weights of the truck need different springs which is why there are so many and based on truck config. My point is that my assumption is the "X-Code" means 6000# rating (the highest) and please correct if I am wrong. According to my 2009 specs (which could be different, IDK) the ONLY config that a 5.4L truck would have the 6000# springs is a CC LB w/snow plow pkg. Not unheard of but rare, unless the previous owner had them put in.

alstaregixxer - are you certain they are really x code springs?