Pylot7

Hey Everyone! As many of you have discovered there are several different front springs and several different rear springs and many combinations that come on the different models.

There are a couple of significant differences however and if we were to work together we can quickly figure out what matters.

I have discovered that depending on the fourth digit in your VIN that you either have a Jeep rated for 4000 to 5000 pounds Gross Vehicle Weight or for 5000 to 6000 pounds gross vehicle weight.

If you have an F in the fourth position of your VIN you have the 4000 to 5000 pound GVW machine. If you have a G then you have a 5000 to 6000 pound GVW machine.

The difference is all in the springs. It may also be in the shocks as there are several part numbers for the shocks and it may be that they actually changed the valving slightly to get the shock/spring combo working right. Putting the heavier springs on your Jeep will yield a benefit in reduced sagging when you add some weight.

Some of you have done a budget boost by putting 4 door springs on your 2 door. But I can also tell you that some of the 4 door vehicles have the same lightweight springs that I had on my low end X. So you don't automatically get the benefit of a higher spring rate with all 4 door take off springs.

If we can figure out which part numbers come with the "G" version of the Jeep then you can know that you will get a significantly stiffer spring or possibly no benefit at all.

It has largely been a crap shoot to this point. But I would like to propose that you post to this thread only the following:

1 - Your Jeep Model: X, Unlimited or Rubicon 2 door or 4 door
2 - Heaviest top you got the jeep with
3 - Your Front Left Spring Number (all jeeps have one number higher on the left than the right to account for drivers side gas tank weight)
4 - Your Rear Spring Number
5 - Your Shock Part Number only if Red/Rubicon shocks, if Black just say black.
6 - The fourth Digit in your VIN: either F or G
7 - Year of the Jeep

Every time you post I will copy your post and edit in the spring numbers on the post following this one.

I will start the list with a set of take offs that came from a four door Rubicon that was the 5-6K GVW type.

Once we get the point at which we know the minimum of the heavies for the 5-6K machines and the maximum of the lighter springs for the 4-5K machines we will have some useful information for those of us wishing to upgrade on the cheap!

Pylot7

1 - Unlimited X 4 Door
2 - Soft Top
3 - 52126316AB Driver ; 52126317AB Passenger
4 - 68004458AA
5 - Black Shocks
6 - F
7 - 2009

1 - 2-door X, tow package
2 - soft-top
3 - Front D/S Spring - 52126314AB
- Front P/S Spring - 52126315AB
4 - Rear Spring - 68004254AA
5 - Rear Shock - Black
- Front Shock - Black
6 - F
7 - 2007



1 - unlimited x (no tow pkg)
2 - hardtop
3 - front driver side 52126315AB
4 - rear 68004459AA
5 - black shocks
6 - g
7 - 2008



1 - unlimited x towpackage
2 - hardtop
3 - front driver side 52126316AB
4 - rear 68004457AA
5 - black shocks
6 - g
7 - 2007


1 - Rubicon 2 door
2 - Hardtop
3 - Front D/S Spring - 52126314AB
Front P/S Spring - 52126315AB
4 - Rear Spring - 68004256AA
5 - Rear Shock - Red 52126752AC
6 - G
7 - 2009

1 - Rubicon 4 door, tow package
2 - Hardtop (dual top)
3 - Front D/S Spring - 52126315AB
Front P/S Spring - 52126316AB
4 - Rear Spring - 68004259AA
5 - Rear Shock - Red 52126752AC
- Front Shock - Red 52126712AD
6 - G
7 - 2008

1 - Rubicon 4 door
2 - Hard Top
3 - Left Front Spring 52126317AB
4 - Rear Spring 68004460AA
5 - Rear Shock Red 52126752AC
Front Shock Red 52126712AD
6 - The fourth Digit in your VIN G
7 - Year of the jeep 2007

dmhines

Crap ... I put my Rubi Unlimited take-off springs on backwards ... got 17 on right and 18 on left ... still sits level though ...

Should you also include whether it came with the tow package?

Pylot7

The higher number should be on the right. It is a slightly heavier spring. You put the 18 on the right so you are good to go!

dmhines

But you posted that your 17 is on the left ???

Pylot7

Yes I have a 17 on the left and a 16 on the right!

See how there can be so many combos??

I am really trying to figure out what spring numbers start the 5-6K GVW because that does make a difference and it is noticeable. Within the lower range and within the upper range I bet its very difficult to notice any difference at all. But between the two you gain another 1000 pounds of weight carry on the springs.

Really the lower range springs are essentially not worth the effort to swap them in. But the upper range are probably worth the trouble if you are coming from the lower range set. I am going to find out. My X had the second to lowest springs on the front and rear. I think the next one down was for the two wheel drive only. I got the set I posted from a Rubicon that was the G version. They are not installed yet but I will put them on in the next few weeks.

I think that if you used the upper range springs and a bb and you hung a winch on the front it would work perfect without a big sag.

In the meantime we can post what we got and figure this out so that others can benefit from the collective knowledge of these springs.

RedneckJeep

All lovely info, but you are not correct about one thing. The difference is NOT in the springs. The difference is in how the Jeep is ORDERED and EQUIPPED. The springs are selected based on this data.

mkjeep

So, if it depends on how equiped when ordering, should you tell them that you are a fat ass with a skinny wife or wife's a fat ass and your skinny or if your both fat asses with skinny kids or vice versa? Wouldn't this also play into tow package options. Ooops, nevermind, I got the tow package

Pylot7

I understand that the springs are determined based on the way the jeep is ordered and equipped.

But, there is a big difference in the springs that make up the 4-5K GVW and the 5-6K GVW.

That is what I am interested in finding out. What are those part numbers?

We are not going to find any springs on a 5-6K GVW jeep that would also be found on the 4-5K GVW jeeps regardless of how they are equipped.

RedneckJeep

Yeah, that probably wouldn't be a bad idea.