Spring Replacements - Heavier Rate

[tonydamato]

Looking for some information on replacement springs.

I am getting ready to go through my entire suspension and replace all the ball joints and steering components as preventative maintenance before I have the truck professionally aligned. In the near future I will be replacing the gutless 6.2 with a 12V Cummins that Im in the process of rebuilding and while the suspension is apart id like to replace the springs with something of a heavier rate to support the additional weight. Now I know there are several springs available for these trucks, but im looking for the heaviest springs that will not alter its current ride height or have VERY minimal impact as I don't want to mess with the suspension geometry or CV angles.

Any and all input is welcome!

 

[Retiredwarhorses]

Not going to happen...but if it were me, I would convert to variable rate springs in the rear. This will require neeUpper and lower control arms, new larger ball joints and new upper spring seat that are casted.

 

[tonydamato]

So by my research the original M998 springs I have are a spring rate of 954lbs in the front with a free height of 13.36", if I were to replace these with the springs from a winch truck that have a rate of 1250lbs and the same free height of 13.36" wouldn't this offer a very minimal change in ride height, if anything leveling the front out with the rear and then sagging back down to factory ride height once the additional weight is added?

 

[karlsmith]

So by my research the original M998 springs I have are a spring rate of 954lbs in the front with a free height of 13.36", if I were to replace these with the springs from a winch truck that have a rate of 1250lbs and the same free height of 13.36" wouldn't this offer a very minimal change in ride height, if anything leveling the front out with the rear and then sagging back down to factory ride height once the additional weight is added?

Good question, anyone have an answer? I thought I read that those 12K springs will actually give close to 2 inches of clearance (15 inches to 16.75 inches)? The post didn't make any mention of additional upgrading required.

 

[tage]

http://flashoffroad.com/Maintenance/FrontEnd/springs/springs_1.htm

ok here you go...

One question; why?
if your front springs aren't sagging. I would just keep running the truck as is and just do the PMCS that you're supposed to anyways before you drive the truck...

I have a set of snow plow springs to replace my sagging fronts. It's just... not an easy swap. lol

 

[karlsmith]

The "why" answer is going to vary by every single sub-culture of Humvee owner. I have a machine with a new engine and an 86 front end. I'm replacing everything anyway. If there is a benefit of less sag since I'm replacing them anyway, "why" not?

 

[tage]

So you have sag. Okay

I got my springs from a surplus shop outside of fort Irwin. Forget the name, but they sold them on eBay a few years ago