LJ rear springs in a TJ

[SkylinesSuck]

Picked these up a while back thinking they were TJ 3" springs. Just looked up the number and discovered they are 3" LJ springs.

https://www.rockjock4x4.com/CE-9131RH1-LJ-Rear-Coil-Spring-3-in.-Lift-Each
Would they net more than 3" lift on a TJ?

 

[rasband]

That really depends on the weight of your rig, but it’s likely.

 

[SkylinesSuck]

I would say lighter than average. Hmmm. Might have to reevaluate my rear springs.

 

[williambmac]

Picked these up a while back thinking they were TJ 3" springs. Just looked up the number and discovered they are 3" LJ springs.

https://www.rockjock4x4.com/CE-9131RH1-LJ-Rear-Coil-Spring-3-in.-Lift-Each
Would they net more than 3" lift on a TJ?

They are probably going to net more on your TJ.
My LJ had a slight sag in the rear because of the 35" spare and the swing out tire carrier. I installed their 4" LJ springs and everything leveled out nice.
A few months down the road I removed my spare and replaced the heavy ass bumper. Now my rear suspension sits about 1.5-2.0 higher in the rear.

 

[jjvw]

What is the free length?

 

[SkylinesSuck]

They are already installed so not sure.

 

[jjvw]

They are already installed so not sure.

What's the ride height?

 

[SkylinesSuck]

I've actually always wondered, where does one measure to determine how much lift springs netted you? Considering differences in tire sizes I mean. Somewhere on the frame to the center of the axle?

 

[JEEPCJTJ]

They are already installed so not sure.

So how does your TJ look now?

Looks good = no problemo

Looks too high = needs some more equipment, or a full 1/2 keg in the back.

 

[rasband]

I've actually always wondered, where does one measure to determine how much lift springs netted you? Considering differences in tire sizes I mean. Somewhere on the frame to the center of the axle?

Tire size isn’t relevant- it’s just spring bucket to top and comparing those numbers to stock length (12” front and 8” rear iirc).

 

[OldGloryLJ]

IIRC the CE LJ springs are 1/2" longer than the TJ springs.

 

[SkylinesSuck]

So how does your TJ look now?

Looks good = no problemo

Looks too high = needs some more equipment, or a full 1/2 keg in the back.

I can always use another keg in the back, but why only half?

It does look like it has a bit of a rake now which is why I'm asking. Not sure if it was just in my head or not, hence my asking.

 

[jjvw]

IIRC the CE LJ springs are 1/2" longer than the TJ springs.

Correct on the rear 4". These are a 3" for the LJ, which is relatively new from RockJock.

 

[OldGloryLJ]

Correct on the rear 4". These are a 3" for the LJ.

Why would they be different?

 

[jjvw]

Why would they be different?

Do you know the free length of the regular RockJock 3" rear?

 

[OldGloryLJ]

Do you know the free length of the regular RockJock 3" rear?

I do not. I assume they are the same rate as the 4" coils and therefore about 1" shorter.

 

[SkylinesSuck]

Okay, finally got a sec to throw a tape measure on it. Obviously the rear axle and thus the spring perches are angled because of the pinion angle, but the average is 12" in the rear which looks like 4" of effective lift if 8" is stock. Also, I measured the top of the tire to the bottom of the flares both front and rear. Front has 7" of opening, rear has 8".

So all of that looks like I'm sitting with about an inch higher of rake to the rear, right? Not sure if that's enough to bother most people or not. I have my old OME 2.5" springs still sitting here. I'm considering cleaning and painting those then throwing the rear pair on to bring the back down a little. This would help with my drive angles too, although my shocks are almost perfect 50/50 right now, so that would throw that outta whack a little.