TJ suspension and shocks - JeepForum.com
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post #1 of 14 Old 01-16-2020, 04:17 PM Thread Starter
pd monkey
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TJ suspension and shocks

First, let me apologize if this has been discussed 1,000's of times before....

I bought a 2003 TJ that has a Teraflex lift and 31" tires. I think the lift is 2" or 2.5" lift? The rear looks like it is sagging. If I measure the springs, I have 15" front and 9.5" rear (again, rear sags). I took it out to the desert and the rear bottoms out on all the whoops/bumps. I am used to having a prerunner and racing Baja so the Jeep is a wayyyyyy different drive. The shocks are silver Bilstiens.

So with my suspension knowledge, I think I need new rear springs and Fox shocks all the way around. With the Fox Performance series, I can revalve the shocks as needed.

What are the good springs to buy? Currie? Where s the best place to buy Jeep parts? I am in San Diego are so there are a lot of off-road companies around.

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post #2 of 14 Old 01-16-2020, 06:07 PM
TheBoogieman
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Quote:
Originally Posted by pd monkey View Post
First, let me apologize if this has been discussed 1,000's of times before....

I bought a 2003 TJ that has a Teraflex lift and 31" tires. I think the lift is 2" or 2.5" lift? The rear looks like it is sagging. If I measure the springs, I have 15" front and 9.5" rear (again, rear sags).
You have 3" lift front and 1.5" rear. How much lift do you want?

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
03' Rubicon/Zone 4" coils with 1" spacers up front/Rancho shocks/5.13 gears-35" MTZs/BM brakes
99' XJ /4.0L-AW4/ 5.5" lift / Rancho shocks/33" DC Extreme country MTs. Jeep #18
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post #3 of 14 Old 01-16-2020, 07:22 PM Thread Starter
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Originally Posted by TheBoogieman View Post
You have 3" lift front and 1.5" rear. How much lift do you want?
I don't want more lift. I want to control the suspension that is has. The rear bottoms out on everything. I know I can't drive it like my Ford Raptor but the rear is way too soft.

First thought was to buy good shocks. I am knowledgeable in tuning Fox shocks so that was going to be my start point. But to order shocks, I need to know the amount of lift. Shocks come in 0-2" lift and 3"-4" lift. When I bought the TJ, the previous owner said it was a 2.5" lift. After measuring the springs, I came up with the numbers you noted 3" and 1.5". Guessing that the PO got the same lift front and rear, I was guessing that the rear springs are sagging.

The Jeep sits almost level, maybe a little lower in the rear. If I put 2 people in the back it squats.

Off-roading, the front feels....just Ok. The back is super soft and springy. It doesn't bounce like the rear shocks are gone but definitely lacking in the compression side.
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post #4 of 14 Old 01-17-2020, 09:52 AM
tworley
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Dont buy shocks based on your amount of lift. Pull your saggy coils and cycle the suspension without them. Measure the distance from the upper mount, to the lower mount when your axle is at full bump. Buy a shock based on that collapsed length.

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post #5 of 14 Old 01-17-2020, 12:45 PM
numchuck
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why not make a call to Rubicon Express ? they can help you 🙂

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post #6 of 14 Old 01-20-2020, 03:59 PM
joe_jeep
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currie makes a good spring.
you would probably want the highest rate they have for desert running duty.

rubicon express makes one of the highest rate coil springs commonly used in wranglers.
i run these cause i tow heavy.

old man emu has a high rate spring as well.

bds 3" rear are 200 in lbs i believe, not too stiff, but decent.

there are a few non conventional rear springs that have been used in lifted tjs as well.
such as caprice wagon, crown vic police interceptor, ect.
there is a post that lists them pretty well, with actual spring rates listed.

the trick will be finding the rate u want, with the ride height u want, at the same time.
the highest rate old man emu springs would match your fronts pretty well i bet. jmho
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post #7 of 14 Old 01-21-2020, 09:33 AM
RDPrimeaux
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I ran caprice classic springs for a little while. I picked them up at a junkyard for $10. They gave about 2 1/2 inches, and were a progressive spring. The pigtail was a little tight so I cut off an inch or so to get them to fit. I found that they were real stiff as they compressed. None of this is in anyway scientific, just my opinion and observation.

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post #8 of 14 Old 01-21-2020, 09:34 AM Thread Starter
pd monkey
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Quote:
Originally Posted by joe_jeep View Post
currie makes a good spring.
you would probably want the highest rate they have for desert running duty.

rubicon express makes one of the highest rate coil springs commonly used in wranglers.
i run these cause i tow heavy.

old man emu has a high rate spring as well.

bds 3" rear are 200 in lbs i believe, not too stiff, but decent.

there are a few non conventional rear springs that have been used in lifted tjs as well.
such as caprice wagon, crown vic police interceptor, ect.
there is a post that lists them pretty well, with actual spring rates listed.

the trick will be finding the rate u want, with the ride height u want, at the same time.
the highest rate old man emu springs would match your fronts pretty well i bet. jmho
Thank you! I am going to change the shocks first and see how much that helps.
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post #9 of 14 Old 01-21-2020, 10:14 AM
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Originally Posted by numchuck View Post
why not make a call to Rubicon Express ? they can help you 🙂
how would calling 4wp help?


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post #10 of 14 Old 01-22-2020, 02:06 AM
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Originally Posted by Ironhead View Post
how would calling 4wp help?
If you look close at the smiley, it may be an indicator he is joking.

Or.....wait, what does 4wp and RE have in common?

If anyone is interested, I have a set of Currie 4" rear springs with about 50 miles on them, enough to settle/sag at ride height. They are "heavy TJ" or "LJ" springs. 9131RH3P $100, you pay shipping or pu at my shop.

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post #11 of 14 Old 01-22-2020, 06:18 AM
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Quote:
Originally Posted by WSS View Post
If you look close at the smiley, it may be an indicator he is joking.

Or.....wait, what does 4wp and RE have in common?
they need a better sarcasm emoji

when RE closed the doors after filing bankruptcy 4WP swooped in and bought the company.
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post #12 of 14 Old 01-22-2020, 08:58 AM
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Originally Posted by Ironhead View Post
they need a better sarcasm emoji

when RE closed the doors after filing bankruptcy 4WP swooped in and bought the company.
I can imagine customer service is at a new low for RE. 4wp is a really hard company to deal with. No one is accountable for getting stuff done and out the door. If they don't have it on hand, it will get screwed up.

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post #13 of 14 Old 01-22-2020, 09:11 AM Thread Starter
pd monkey
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After lots of years being part of off-road racing, I have learned all the big shops suck. They are after the "bolt-on" crowd. There are very few people that know the technical side. They can look up a part number but thats about it. ORW used to have some good people but they all move on to specialized shops.
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post #14 of 14 Old 02-02-2020, 11:00 AM
joe_jeep
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important u flex it out, and make sure the bump stops are set up right!
usually we dont like poly bump stops, we prefer the factory soft rubber ones.
if you run higher speed off road, perhaps the poly bump stop isolators might work better for you?
you probably know them better than us.

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