Stretched Xj.

88Xj

Banned
Had fun the past few days. I had my terraflex arms set to 16" eye-eye for my 3" lift. But going over bumps or uneven road at city speeds (45mph-ish) felt uneven and rough. So I started looking at stretching my front end and rear end. Obviously the only way to stretch the rear is buy adjustable spring perches or longer leafs. I do want to run the Davescustom antiwrap spring perches one day. They are of course antiwrap and allow you to move the axle forward .75", leave it in the stock location or more it backward .75". Anyway since I have adjustable uppers & lowers I decided to push my front axle forward a few inches. Most people say you can move the axle about 2" forward without issue, so I went for it. I set my lowers to 18.5" and uppers to 16". That moved my axle forward about 2.5" without much issue, other than needing some fender trimming. Caster was almost perfect and needed minor adjustment but no binding anywhere.

My setup is a Rustys HD 3" coil, stock track bar, Zj steering, no sway bars at all. I am running Jk shocks currently and they compression more than enough, but aren't long enough. They are 17" collapsed & 24.5" extended. I just ordered Dt8386 shocks though as they are 17" collapsed & 29.8 or so extended.
Ride improved greatly, and so did flex.
Before I could flex pretty good, but now (with shocks disconnected because they limit down travel) I can flex good enough to get my trackbar bracket on the frame. Yes, when stuffing my passenger side wheel my trackbar bracket will contact the frame. Obviously it won't flex anymore than that.
No bumpstops up front at all and yup I need to trim a little lol. When stuffing my driverside wheel, I get it pretty far, but the trackbar hits the trackbar bracket which limits me.
Idk if a aftermarket trackbar will solve this or not? My axle in center perfectly, it just hits when flexing. I have no binding at all, lock-lock even at full stuff/droop. I do however max out the TRE on my pitman arm. I am soon going OTK with my ZJ steering so that should help.

Anyway front setup is listed, rear setup is 1" OME MD leafs, and a 2.5" full length RE AAL, stock shackle and Rancho Rs9000 shocks. It gives about 2.75" of lift and sits slightly lower than my front. I soon plan to have shackle relocation boxes and a MJ shackle to better ride & flex.
Currently my leafs have 2 clip holding them together and the clips are as close to the center of the leafs as possible. When flexing my leafs seperate almost completely. It bearly lifts the rear wheel when flexing, so the longer shackle and relocation boxes will be a nice upgrade!

I'll have pictures shortly but wanted to share my experience.
I also learned that scraping rockers in a Xj is much to easy, so the 2x6 rocker replacement is now top of my list, as well as getting my front locker installed.
 

jscusmcvet

Explorer
Will be interested to see pics. I have my 01 xj at 3" and currie arms set at 16". Could stand a little smoother ride, so eager to see and hear more about yours. Of course I do not yet have adjustable uppers so I may need to wait.

John
 

88Xj

Banned
Ya You need to adjust caster with your uppers. You set the axle forward with lowers and adjust caster with uppers. 18" lowers & around 16" uppers were just about perfect for me. I have 31's and 3" and no flares, but no trimming either. And I'm not rubbing until I flex it out. I did it the right way though, I pulled my shocks and coils and flexed the jeep/cycled the suspension to check for binding.

I'd say set yours LCA's 17" or so and try that. It will take mere minutes and you shouldn't need to adjust your caster really. And it'll give you a smoother ride.
I'd like to move my rear axle back about an 1 or so, thats why I plan to do the adjustable perches in the futrue. This will net me a 105" wheel base roughly and sinces the axles further back, it'll carry weight better and give me a better departure angle.
Stretching the front gives better approach angle!
 

jscusmcvet

Explorer
Well it is raining and looks like it will for the rest of the weekend, so I took an hour or so after work and moved the LCA's out to 17". We'll take it for a road... and a bit of offroad... test tomorrow and report. Definitely put the tires more centered in the wheel well.

John
 

Stumpalump

Expedition Leader
The best thing I had when I built my XJ was a real articulation ramp in the yard. There is no way to dial in all of the variables without it. Sounds like you are on track. Don't worry so much about how long it is vs where the wheel needs to be when stuffed. The inner wheel wells on XJ's are very mallable so beat them with a BFH for the most articulation that you can get. The stock track bar and bracket need to go. It's weak and so are the steering box mount. These front frame plates are also good because they tighten up the handling and stop the flex. Do it or somthing like it first. It's one of the best kept secrets on an XJ. http://www.temper-mentalracing.com/TMR/Parts_and_Services.html
 

cocco78

Adventurer
I pushed the axle ahead 2" or so on my MJ to keep the tires out of the back of the wheel well when flexed out, and i'm running a 4.5" lift and 38's :)

You could flip your rear springs around for a couple inches of stretch, i'm running this setup in my rock crawler. It would be more work than its worth probably, relocate fuel tank, comp cut, ect.. Also the anti wrap spring perches will do nothing for axle wrap, I wouldn't waste my time doing this as an upgrade. I was swapping a new axle in that needed new perches anyway and I was feeling lazy, so I picked up a set. Nice though if you have to move your axle a little bit to fine tune placement, but otherwise a waste of money.
 

88Xj

Banned
I think this is getting off track...I stretched my Xj only to get a better ride over bumps and such. Going over speed bumpers or alike it felt rough and unstable. Now it feels tons better, feels like the suspension it actually doing its job.
3" and 16" lowers just didn't feel right. The lowers are now at 17.8" and uppers around 16" or slightly shorter after setting the cast..Feels tons better. I only did this for ride comfort though.
I use a loading dock behind the autoshop class, with permission of course to flex my jeep. My little brother goes there, and he shows it off to his friends lol.
I gained flex and the jeep feels more stable but I was chasing ride comfort mainly. The other stuff is just a bonus! At full flex I don't rub anything except my fenders, but again they are 100% untrimmed. So once they are trimmed I'll have no issues.
My rear doesn't rub at all.


My jeep has a TnT inner brace, I have Tnt chassis stiffeners, they next thing I'm buying is the Currie stiffeners that connect the front & rear suspension! I'm also welding in 2x6 to replace my rockers. Passenger side will act as a air tank, and they will be tied into my stiffeners since they will be my rock rails as well.
 

jscusmcvet

Explorer
Got to say that after taking the xj for a test ride today I did notice an on road difference with the extended control arms. As you mentioned, better stability, definitely better bump absorbtion.

Thanks for the idea.


John
 

88Xj

Banned
From everything I'm reading online, you want your coils/shocks at a slight forward angle. Or a positive incline!
So the bottom of your shock should be more forward than the top, not that this is a good example but.. / <--leaning like that lol.
Nothing drastic or anything, but having a slight positive incline will give a better ride and more travel! So I'm happy, seems your happy! Glad I did this.:ylsmoke:
 

jscusmcvet

Explorer
Got to say that after taking the xj for a test ride today I did notice an on road difference with the extended control arms. As you mentioned, better stability, definitely better bump absorbtion.

Thanks for the idea.


John

Perhaps a bit of vibe that I did not have before... considering dialing it back a bit or just going ahead and springing for the adjustable upper control arms... hmmm

John
 

Steve F

Adventurer
I'm surprised such a small stretch is noticable at all, the biggest difference I ever got in ride quality was installing drop brackets for the control arms to get them back to close to horizontal. With adjustable uppers and lowers extending the wheelbase an inch or so has never made any noticable difference to the ride to me anyway but it has worked well to center the 35's in the wheel wells. Certainly fixing the caster will make it feel much better and more planted on the road though and will remove any shakey/loosness that incorrect caster gives you.

Cheers
Steve
 

Forum statistics

Threads
189,935
Messages
2,922,407
Members
233,156
Latest member
iStan814
Top