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Old 07-20-2010, 07:53 PM   #1
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Considering a spring swap.

I'm considering changing out my springs for heavy duty springs. The last 2 digits on my fronts are 14 and 55's in the rear. I'd be putting in 19's and 60's. I don't have a really good reason other than I like knowing I have a more heavy duty suspension. One of the first things I did was swap the stock shocks for Bilstein gas shocks.

I don't plan on adding a lift or larger tires. I have a 2 door with a soft top. Based on what I hear from others I would expect about a 1 inch lift. Am I wasting my time? These springs only cost $149 brand new for the whole set.

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Old 07-20-2010, 08:07 PM   #2
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I dont think its a waste...youll get another inch of height for $149. If it makes you happy adding these springs on top of the shocks you already added, then go for it!

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Old 07-28-2010, 01:55 PM   #3
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After much deliberation, I have decided to go through with the swap. I have the springs on order from a Mopar dealer. It will take a little while to get them since they are being ordered from the factory. I'm not in a hurry though because I'm waiting for slightly cooler weather to undertake this task.

In the meantime I've upgraded my floor jack and jack stands in order to handle the job. My old one barely got the tires off the ground, but was good enough for tire rotations. I made the mistake of putting my gas shocks on by "muscling them up instead of using jack stands on the frame and lowering the axle. By the time I hand compressed the last HD shock, I was spent.

I've always taken the anecdotes of added lift from spring swaps with a grain of salt so I plan on taking measurements before and after. I won't be adding spacers or leveling kits and will be keeping the same tires so I should get a true reading of before and after.
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Old 07-28-2010, 02:37 PM   #4
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are those the ones from the rubicon or unlimited or unlimited with tow package? just wondering.
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Old 07-28-2010, 02:46 PM   #5
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After much research that was conducted on another forum, it seems there is no set part number for the Rubicon or unlimited or unlimited with tow package. Some people with the same Jeep had different part numbers. the last 2 digits denote the stiffest springs. 19's for the front and 60's for the rear are the stiffest springs they make. They also appear to have more coils.

Generally an Unlimited with a hard top and the tow package had the stiffest springs. Rubicons generally had stiffer springs, but not necessarily the stiffest. Some people have switched to "Rubicon" springs and have gained absolutely nothing since they switched to the same part number or very close to the same part number.
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Old 07-28-2010, 02:55 PM   #6
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Quote:
Originally Posted by daggo66 View Post
After much research that was conducted on another forum, it seems there is no set part number for the Rubicon or unlimited or unlimited with tow package. Some people with the same Jeep had different part numbers. the last 2 digits denote the stiffest springs. 19's for the front and 60's for the rear are the stiffest springs they make. They also appear to have more coils.

Generally an Unlimited with a hard top and the tow package had the stiffest springs. Rubicons generally had stiffer springs, but not necessarily the stiffest. Some people have switched to "Rubicon" springs and have gained absolutely nothing since they switched to the same part number or very close to the same part number.
He swapped his 2dr springs with the Rubi and got some lift and stiffer action, pulling his trailer, I think he's pretty happy, well not happy, but satisfied !!

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Old 08-04-2010, 10:20 PM   #7
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FedEx guy brought these to the door around 3:30. So at 4PM I started grabbing the tools and got started. It was 90 degrees and about as humid as it could get. I got the first front spring done with no problems. Got to work on the second one. Lowered the axle with the jack and popped out the old spring. Started putting in the new one and couldn't get it to fit.

I worked and worked and couldn't get it in there. I was sweating like a pig and started feeling a little light headed so I took a break. I grabbed a Power Aid and sat on the step looking at the Jeep. That's when I noticed how stupid I was. I lowered the axle to let out the old spring, but didn't drop it any lower to allow the new one to fit.

The backs went it without issue. I took measurements before and after from the ground to the bottom edge of the flares and from the ground to the bottom of my rock sliders. I gained a full 2 inches all the way around.

I went from 14 to 19 springs in the front and 55 to 60 springs in the rear. Looking at the new and old side by side, the new ones were definitely thicker and had about 1 1/2 more coils.

I didn't notice too much difference in the ride because I already had Bilstein HD shocks. My wife said she definitely felt the bumps more. It is sitting noticeably higher.
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Old 08-05-2010, 05:22 AM   #8
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Pics or it didnt happen!
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Old 08-05-2010, 05:31 AM   #9
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I'll get some on Saturday. It looks like we're going back to Assateague for the day.
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Old 08-05-2010, 11:17 AM   #10
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[
I worked and worked and couldn't get it in there. I was sweating like a pig and started feeling a little light headed so I took a break. I grabbed a Power Aid and sat on the step looking at the Jeep. That's when I noticed how stupid I was. I lowered the axle to let out the old spring, but didn't drop it any lower to allow the new one to fit.



LOL, The extreme heat can make you do $hit like that, been there , done that. Post them pics when you can.

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Old 08-08-2010, 02:28 PM   #11
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OK, here are a couple of comparison pictures. I also picked up a set of Rubicon take-offs today.

Before:


After
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Old 08-09-2010, 06:43 AM   #12
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The spring swap made a monumental difference for me ---- I wasn't out for height though and I think that's a bad reason to do the swap. I needed them for the additional weight I was carrying with bumpers, winch, & trailer.
The spring rate I have now is perfect for the way my Sahara is kitted and used.

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Old 08-09-2010, 07:36 AM   #13
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Why do you say it's a bad reason? My main reason was that I wanted the HD suspenison. The lift is a pleasant side benefit. It certainly makes more sense to me than adding a 1" or 2" puck and risky possible warranty issues. I don't see this method causing any issues since the only thing under there are Mopar coils.
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Old 08-09-2010, 07:43 AM   #14
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where do you check for the numbers? last digit and are they found relatively easy?
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Old 08-09-2010, 07:58 AM   #15
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The springs have tags hanging on them. The last two digits are what tells them apart. There's a thread on JK-Forum that someone started in order to try and make sense of the different spring rates. Lets Solve the Stock Springs Question The fronts range from 13 to 19 and 60 is the highest for the rear. There doesn't seem to be any tried and true rule from the informal survey as to which Jeeps get which springs. However, 4 door hardtops with towing package are more likely to have the stiffer spring rates.

My X had 14's in the front and 55's in the rear. The new springs appeared slightly thicker and were at least 1 1/2 coils taller.
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Old 08-09-2010, 08:32 AM   #16
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just checked, i have 17-57 springs on my 07 4dr with dual tops sahara and tow package (still not sure if i have the 4.10 gears i heard comes with that but i have the receiver and trailer plug...)
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Old 08-09-2010, 09:10 AM   #17
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I doubt you would see a significant, if any, change since you have nearly the stiffest available. It was a big difference for me because I have a 2 door.
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Old 08-09-2010, 09:17 AM   #18
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yeh i can understand that. i was just curious to see what i had. i dont plan on changing them out, especially now that i know im pretty close to the higher numbers and what they mean.

it definitely changed your 2dr i likey
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Old 08-09-2010, 01:38 PM   #19
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I have 18's in the front and 58's in the rear. Would I gain anything from going up to 19's and 60's?
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Old 08-09-2010, 02:54 PM   #20
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IMO it wouldn't be worth the effort.
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Old 08-09-2010, 04:00 PM   #21
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I didn't figure it would. I may do it if I can find a set cheap online, but I won't be looking too hard.
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Old 08-09-2010, 04:54 PM   #22
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Quote:
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Why do you say it's a bad reason? My main reason was that I wanted the HD suspenison. The lift is a pleasant side benefit. It certainly makes more sense to me than adding a 1" or 2" puck and risky possible warranty issues. I don't see this method causing any issues since the only thing under there are Mopar coils.
Suspensions are tricky to get right.
Every one of the stock JKs that I've driven have seemed undersprung and underdampened to me; so I'm instantly in favor of adding more spring and shock. Those new springs would kill stock shocks; good choice on the Billies.

And I think it will work GREAT on the street. I'm just afraid that, without a little extra weight, they'll beat you to death offroad. It's a Goldilocks thing; this bed too hard, this bed too soft, this bed just right.

So... ...add a rear bumper and a winch, maybe a couple of skids...

Looks much better now, btw.
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Old 08-09-2010, 06:00 PM   #23
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At the beginin of the thread I was like hell yea add new springs maybe gain a inch or more... went out and looked under the jeep and crap I have 58s... Oh well at least it worked for you daggo66
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Old 08-09-2010, 07:01 PM   #24
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Quote:
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Suspensions are tricky to get right.
Every one of the stock JKs that I've driven have seemed undersprung and underdampened to me; so I'm instantly in favor of adding more spring and shock. Those new springs would kill stock shocks; good choice on the Billies.

And I think it will work GREAT on the street. I'm just afraid that, without a little extra weight, they'll beat you to death offroad. It's a Goldilocks thing; this bed too hard, this bed too soft, this bed just right.

So... ...add a rear bumper and a winch, maybe a couple of skids...

Looks much better now, btw.
The shocks were one of the first things I did to the Jeep and they made a HUGE difference in the ride. The new springs haven't made as big a difference in the ride quality. In the sand at Assateague last Saturday, it was no different. I'm looking forward to trying it with the new tires this week. Since my wife and I have become addicted to the beach, it will probably be a little while until I get to compare the ride on the trail.
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Old 08-09-2010, 07:59 PM   #25
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Air down to about 15 psi at the beach; have fun.
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Old 08-09-2010, 09:11 PM   #26
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Air down to about 15 psi at the beach; have fun.
That's exactly what I do. Each week we've been progressing. We got scorched the first week so we bought a canopy and a couple of chairs. Now I'm using a cargo rack to carry everything.

After 2 weekends of airing down one at a time and watching people pull up, air down with deflaters and drive off before I was finished, I bought a set of Smittybilt deflaters. I used them last week and they worked great. This week we get to try out the new BFG MTs.
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Old 08-15-2010, 04:54 PM   #27
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The thread on JK-Forum , also said the spring number's on the Driver side were one number lower . Front 15 pass. 14 driver -Rear 58 pass. 57 Driver, due to the fact the passenger side weight's more than the Driver side .
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Old 08-15-2010, 08:02 PM   #28
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My 2009 JK 4dr dual top group and tow pkg had 17 and 58.
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Old 08-15-2010, 09:44 PM   #29
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The thread on JK-Forum , also said the spring number's on the Driver side were one number lower . Front 15 pass. 14 driver -Rear 58 pass. 57 Driver, due to the fact the passenger side weight's more than the Driver side .
That was on some, but not all. Speculation was that it was to compensate for the fuel tank.
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Old 08-22-2010, 09:20 AM   #30
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Hi, I have a 2000 TJ Sport. I have 32in X11.5 tires on it that look great and don't rub without a lift, however, I have a plow for it and it sags the front end to low. My mechanic said to get Heavy duty springs and new shocks. I was hoping to gain a little bit of lift and less sag. The rear springs are fine. I only want to change the front end. I'm wondering if this setup you used would work for me. I really don't want a stiff uncomfortable ride either. What do you think?

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