[asknight]

My question is, which RS9000XLs do I want with the RC 2.5" progressive springs? I hope to order tonight.

Rancho says RS999239/RS999241 with the 2.5" RS6503 lift kit (springs and lower control arms only) and says to use RS999255/RS999256 with the 2.5" RS6505 Rock Krawler lift kit.

What's the difference between the 239/241 and 255/256 shocks? *Disregard, the measurements were located on Quadratech and listed at the bottom.

I have lost my last filling in my teeth and can't think of a better time to upgrade to the RS9000XLs since they have $100 rebate right now.

Edit: Quadratec's shock adviser chart is recommending the 255/256 shocks for 2.5-3" of lift...

Qtech is showing the following;
Front
239 23.13"/14.5" - 8.63" travel
255 25.88"/15.88" - 10" travel
Rear
241 20.88"/13.63" - 7.25" travel
256 24"/15.13" - 8.87" travel

Which ones would you choose?

[DH19922010]

The 255 and the 256 will require you to extend your bump stops so the shocks don.t bottom out but they will allow for more down travel

[Unlimited04]

Originally Posted by DH19922010

The 255 and the 256 will require you to extend your bump stops so the shocks don.t bottom out but they will allow for more down travel

so will the 239/241.

With 2.5" lift...
14.5" front shocks will need 1" bumpstops
13.5" rear shocks will need 1" bumpstops.

255/256-
15.88" front shocks will need ~2.5" bumpstops in front
15.13" will need ~2-3" bumpstops in rear.

from: http://www.jeepforum.com/forum/f9/bu...points-734737/

Why not buy OME shocks? the lengths work much better for 2.5" of lift.

Front N66: 22.4"/13.2" = 9.2" travel - no bumpstops needed
Rear N67: 22.1"/13.3" = 8.8" travel - needs 1" bumpstops

[asknight]

I already have the rear bumpstops extended 2" to comply with the RC 2.2 requirements to keep them from blowing out. I went ahead and ordered the 239/241 with the plan to cut the rear bumpstops down to 1" and add 1" to the front that is now at factory bumpstop length.

Unlimited04, the biggest reason I chose Rancho 9000XLs is for their adjustability. The second reason is that they have a $100 rebate promotion in effect right now. I had a hard time understanding whether OME had a shock valved specifically for a super lightweight TJ as mine is a 4cyl soft top and my biggest complaint is the bone-jarring ride of the RC 2.2s. I interpreted that their shocks (like most everyones) is valved with the 6cyl hardtop TJ in mind with the only difference between their "light duty" and "heavy duty" lift kits is the spring rate.

I'm hoping to be able to dial in the shocks to something more compatible with the lighter weight of my Jeep than a more universal valved shock.

One of the questions I have that I won't be able to answer until I have them installed is how well they fit with my RC 2.5 springs. I have the RC 2.5" kit intended for a 6 cyl TJ in order to have a level stance without the need for additional coil spacers, however, those springs have given me an honest 3.25" of lift on the front and 3" rear even with the Warn M8000 mounted up and 5-6k miles to settle the springs. The worry is a lack of downtravel with the 239/241s on a true 3-3.25" lift. My thought is that the 239/241s may allow me to install JKS barpin eliminators that I've had in mind for awhile without any other penalties while getting the shock back closer to it's intended up/down travel ratio.

[Unlimited04]

Originally Posted by asknight

Unlimited04, the biggest reason I chose Rancho 9000XLs is for their adjustability. The second reason is that they have a $100 rebate promotion in effect right now. I had a hard time understanding whether OME had a shock valved specifically for a super lightweight TJ as mine is a 4cyl soft top and my biggest complaint is the bone-jarring ride of the RC 2.2s. I interpreted that their shocks (like most everyones) is valved with the 6cyl hardtop TJ in mind with the only difference between their "light duty" and "heavy duty" lift kits is the spring rate.

dang, $100 rebate is a good deal

yea, the light duty OME shocks are denoted "C" for Comfort. N66C/N67C
N66C: Old Man Emu NitroCharger Shocks (N66C)

keep in mind the JKS BPE will need another 1/2-1" of bumpstop extension, since it pushes the shock out of the frame mount by about that much. best bet would be to do the rear lower shock mount relocation and the long travel 4" lift shocks (256?).

[asknight]

Originally Posted by Unlimited04

dang, $100 rebate is a good deal

yea, the light duty OME shocks are denoted "C" for Comfort. N66C/N67C
N66C: Old Man Emu NitroCharger Shocks (N66C)

keep in mind the JKS BPE will need another 1/2-1" of bumpstop extension, since it pushes the shock out of the frame mount by about that much. best bet would be to do the rear lower shock mount relocation and the long travel 4" lift shocks (256?).

NOW I know how OME names their shocks! Thank you for enlightening me!

Understood on the BPE. The worry with the 256 shocks was unseating the RC coils, which they've very prone to doing. The 4cyl TJ doesn't have a rear swaybar.

[Unlimited04]

Originally Posted by asknight

NOW I know how OME names their shocks! Thank you for enlightening me!

and "L" for OME denotes "long travel", aka 10-11" travel. N67L is for a 4" lift, or custom relocated lower rear shock mount application....they also have new Sport shocks, in shorter and longer travel versions for those that like the stiff ride.

[asknight]

The RS9000XL shocks arrived today, were installed, and are good to go! I'm glad I chose the 239/241s now since I had the opportunity to compare them side-by-side with the RC 2.2s once they arrived. They are very close in length and I'm already properly bumpstopped for the 2.2s. The 2.2s are RC's latest generation (shortest.) I'm afraid I would have had to add additional bumpstop extensions with the 255/256 shocks.

The 241 rears are 1/2" shorter collapsed and 5/8" shorter extended than the 2.2s. With 2" rear bumpstops I was hitting the hard bumpstop at the same time as the 2.2 shock was bottomed so if I keep the 2" stop extension I'll have 1/2" buffer before the RS9000 shock bottoms.

The 239 fronts are the same length collapsed and 1/4" shorter extended. No change in bumpstops required (1.25" bumpstop extension in place).

Immediately after mounting them up and doing a bit of routine maintenance (tire rotation, greased ball joints, etc) I made sure all 4 shocks are adjusted to 1, the softest setting and took off down the 3 mile dirt road behind my house. It stays washboarded by the rain and there's about a 1/8 mile of gentle whoop-de-doos. I never could exceed 10-20mph on this road with the 2.2 shocks and tonight I was cruising it at 45mph comfortably with the shocks on 1. However, I had a bit of slight body roll in the curves that I totally forgotten about in a Jeep with the stiff 2.2s. I tuned the shocks up to 3 and the body roll was gone with only a ~5 MPH penalty on the washboard road.

Cliff notes: I'm extremely happy with the RS9000XLs vs. the RC 2.2s and now my 4 year old Jeep with only 20k miles can begin to log miles much more frequently.