rsmwrangler

OP, what's the weight on the bumper ? the 617's are the light/medium duty springs, you can get the 618's, which are the next ones to support up to 330lbs more (constant weight), so you'll go from 160lbs/inch spring rate in 617's to 175lbs/inch with the 618's, and the difference in free height is only 5mm, so they should work better with that bumper and the setup you have in the back.

EHarris

I have two heavy duty jacks and 4 jack stands and I plan on putting in the same coils except the 618 instead of the 617.

EHarris

Not sure if of the weight but it's an LOD Gen 4 armor light. I think you are right. I should have the 618 in the rear. I've never done something like this before but it seems as if a shop would charge a lot just to do two coils.

GTJeeper

OP, I recently installed the OME HD springs on my own in my garage. My rear isn't crazy heave but it has some weight, I did use the 618s and it sits a lot higher than that. I can post up a pic or two if that would help give a visual. I'm 18 and I installed it on my own in about 5 hours for front and rear. It's not too difficult and is a pretty straightforward, I used a write up on the site project JK to follow, super detailed and gives all the needed torque specs as well.

resharp001

Although not technically difficult, it's never fun to mess with springs. 2" spring might not be too bad though. You might want to borrow a set of coil compressors from autozone just in case you need them. I'm not a fan of using em, but sometimes they can help if you need just a little bit more clearance. Always use with caution!

EHarris

Thanks for the info boys. I will def put in the new springs so that it sits level again and so I stop bottoming out after every large bump doing 75 on the highway.

I'd definitely like to attempt it myself and the shocks look super easy. I've heard those coil compressors can get dangerous.

Canvas

If you are bottoming out on bumps that is your shocks. Normally shocks las about 50k to 75k miles. How you know the shocks are going, there will be a floating feeling going over bumps with a slight bounce after the bump. Coil spring usually do not go bad unless you are really beating on them like jumping your Jeep.

As for replacing the coil springs be sure to disconnect the socks at the axle, sway bar links and the track bar. That will give you plenty of room to articulate the suspension. DO NOT DISCOONECT ANY CONTROL ARMS. you do not want the butt kicking.

Jack the Jeep as high as tour jack stands can safely support and place the stands forward of the rear axle on the frame. Remove the wheels and lower the jack slowly you will see the coils relax and possibly unseat.

Reverse the installation.

R/
Will

EHarris

I've got 100k on the shocks. They are nitro charged and I don't really beat on the JK too much but I think with the weight of the rear end in addition to the age of the suspension is causing my issues.

I've got a lifetime powertrain warranty and I have 110k on it now. I think maybe I should just replace the suspension now and enjoy the benefits of a new one and hope that it makes it to 200k.

My upper bumpstops are shot also so I'll replace them too.

EHarris

You can see the sag in this shot.

resharp001

Dang, unless you got about 1,000 lbs of cargo in the back there.....that is some pretty bad sag. I'd replace the shocks and then reassess before addressing new springs. You may or may not determine you need them after that, but the shocks definitely sound like they're toast.