Hello, I have an 08 JK 2 door with a 2.5" lift. I am looking to get 4 new rancho 9000xl shocks. I did a search on here and found that a Rancho rep advised someone with a 2.5" lift to get part numbers: 999329 for the fronts and 999330 for the rears as they are designed for a 3" lift (the rancho website says that these are designed for a 4" lift). I just got off the phone with rancho and they suggested the 999326 for the fronts and 999328 for the rear as they are designed for a 0-2" lift. I don't really know too much about shocks for lifted vehicles and I don't want to get the wrong size shock. Can someone confirm which one is best for a 2.5" lift?

Thanks!

 

I have a 2008 4dr with a 2.5" budget boost and I have the ones made for the 4" lift. I haven't had any problems.

 

The most important reason for choosing one length shock over another is spring retention.

Too short and your shocks will limit down-travel and you might lose traction earlier on uneven terrain.

Too long and your coil springs could dislodge and then you'll be riding on your bump stop when you come down.
Or worse, do fender or under carriage damage.
Least that could happen is the spring rotate out of the notch and cause it to bow.

If you have spring retainers or travel limiters (other than your shocks), this won't be a problem.

 

Correct ^^ The Rancho site list for a 4" short and 4" long arm suspension iirc. You need to go by the specs to fit your needs. Not what they list for lift height. The 29xl and 30xl are usually recommended for lifts in the 2-3" range, but properly set up you can even run the 31xl and 32xl which are around a 11" travel shock.

Which 2.5" coils ? With a progressive/dual/triple rate coil with more extended length at droop. You can run a pretty long shock if bumped correctly. In the front you should have exhaust spacers, a smaller id driveshaft or limiting straps to limit down travel if need be.

If your jeep is mostly on road and you don't want the travel. The 29xl and 30xl will be fine.

 

I recently added the 29/30 to my setup on my JKU. I installed them along OME medium on the fronts (stubby bumper w/ winch synthetic line) and teraflex 1/2 spacers, and HD rears. I run with no spare tire bc I'm waiting to buy a tire carrier. I have 315/75/17 and also simmity's flat fenders. Unfortunably I've only been able to make a few trips off road but had no issues with my setup. I chose 'em bc of the OME coils yielding more clearance than stated. Hadn't had a problem yet, but then again not much wheeling so far. I also got the bumpstops but did not installed yet and didn't have a problem. I did wheel with the spare on the cargo area wich added some weight to the back.


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