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-   -   Need new rear suspension or leaf springs!! (http://www.jeepforum.com/forum/f177/need-new-rear-suspension-leaf-springs-1060916/)

hellbabies123 06-30-2010 12:51 PM

Need new rear suspension or leaf springs!!
 
So i have a xj and ive recently have been beating the hell out of the suspension. The leaf springs now are pretty much flat or maybe even a little bit negative. The rear shackles that are on it say it is a skyjacker 5.5 inch lift (jc55rs), the only problem is i dont know if that is right because the guy before me liked to mess with it alot. I need to know if there is a way you can tell exactly what size lift it is or what size lift you can put on with out messing with the drive train. Please help!! also if any other options please let me know!

McLovin 06-30-2010 12:54 PM

Lots and lots of options. As far as telling what you have, post a picture of your rig and include the size of tires.

HenryKrinkle 06-30-2010 03:16 PM

There is a method to measure ride height from the top of the axles to a standard point on the body. There is a diagram of this floating around somewhere along with the stock measurements.


If you have stock fenders- the rear is supposed to be 17" from the center of your hub to the bottom of the flair. I'll keep digging for the other method...

ETA:

Found it:

http://jeep-forums.4wd.com/showthrea...l=1#post127604

hellbabies123 06-30-2010 04:52 PM

yeah well i have 32s on it and what i just wanna know is if there is a way to measure an unknown lift. or if there is a big difference between different sizes like a 4 to 6 and if the drive train would need to be extended.
thanks

kirbWJ 06-30-2010 05:45 PM

SYE/ CV driveshaft or T-case drop at 4", longer control arms/ LCA drops, longer brakelines. at 3" all you need is longer brakelines and longer shocks, you can run the stock arms but it will limit your flex= arms hit the shock mount.

you can measure your lift SOMEWHAT accurately. stock measurment says that the XJ sits 17" from lowest point of frame rail to ground. at 3" lift and 31s i sit at 23", you can try throwing stock size tires on your XJ and measure that way OR calculate the tire size you have compared to stock size - 225/75 r15. thats the best i can think of.

get rid of the shackles, do a bastard pack from chevy s10 leafs (basically a new leaf pack), you can get 5" out of that. just remember anything over 3" gets really pricey.

Kettles 06-30-2010 07:40 PM

Measuring from the center of the hub to the bottom of the flare works regardless of tire size. I did some measuring for somebody recently for people with trimmed flares (if yours are trimmed) Ill see if I can find the number to the lower bend in the body line of the quarter panel.

Edit:
Ah here they are... from the center of the hub to the lower bend in the body line should be 22.5" front, 25" rear, stock. So 5" of lift would be 27.5" front, 30" rear.

kirbWJ 07-01-2010 01:18 AM

Quote:

Originally Posted by Kettles (Post 9716440)
Measuring from the center of the hub to the bottom of the flare works regardless of tire size. I did some measuring for somebody recently for people with trimmed flares (if yours are trimmed) Ill see if I can find the number to the lower bend in the body line of the quarter panel.

Edit:
Ah here they are... from the center of the hub to the lower bend in the body line should be 22.5" front, 25" rear, stock. So 5" of lift would be 27.5" front, 30" rear.

why not measure from the frame rails?

Kettles 07-01-2010 08:26 AM

Quote:

Originally Posted by kirbWJ (Post 9717996)
why not measure from the frame rails?

Frame rails to the axle? Because that requires lying on the ground.. I can measure from the hub to flare (and hub to body line) in 10 seconds without any effort. And the hub to flare is the standard way of measuring ride height, so I just moved the reference point up to allow for trimmed fenders.

I could measure the frame to axle if you really want I suppose.

hellbabies123 07-01-2010 10:25 AM

ok well do u think i will have any problems then just swapping out the leaf springs?

93gc40 07-01-2010 10:35 AM

Quote:

Originally Posted by Kettles (Post 9718863)
Frame rails to the axle? Because that requires lying on the ground.. I can measure from the hub to flare (and hub to body line) in 10 seconds without any effort. And the hub to flare is the standard way of measuring ride height, so I just moved the reference point up to allow for trimmed fenders.

I could measure the frame to axle if you really want I suppose.

Only problem with your method is it does not work if you have trimmed fenders or modified flares or no flares.

The Dirty Method
Alright, for those of you with cut-up fenders (who knows, I may be there one day, once my XJ becomes a trail rig), here is measuring your ride height the "dirty method":

Checking Front Ride Height

Measure front ride height with the vehicle unloaded (no luggage or passengers) and with the fuel tank full.

Place the vehicle on a level surface and measure the veryical distance between the top of the axle tube (A) and the underside of the frame sill (B). Refer to Figure 1 for driver's side measurement and Figure 2 for passenger side measurement. Be sure each measurement is taken from the top of the tube and not from the axle or shift motor housings.

With Standard or Soft Ride Suspension, vertical distance should be 17 cm (6-3/4 inches) plus or minus 13 mm (1/2 inch). With Heavy Duty Suspension, vertical distance should be 20 cm (7-3/4 inches) plus or minus 13 mm (1/2 inch).

Checking Rear Ride Height

Measure rear ride height with the vehicle unloaded (no luggage or passengers) and with the fuel tank full.

Place the vehicle on a level surface and measure the vertical distance between the top of the axle tube (C) and the underside of the frame sill (D) inboard of the jounce bumper (E).

With Standard or Soft Ride Suspension, vertical distance should be 15 cm (6 inches) plus or minus 13 mm (1/2 inch). With Heavy Duty Suspension, vertical distance should be 18 cm (7 inches) plus or minus 13 mm (1/2 inch).



*Note: Fig. 3 refers to MJ suspension, but is very similar to XJ.

Kettles 07-01-2010 11:20 AM

Quote:

Originally Posted by 93gc40 (Post 9719627)
Only problem with your method is it does not work if you have trimmed fenders or modified flares or no flares.

uhh... yeah it does.


What about hub to bend in body line do you not understand... Here is a diagram. I added in a measure from the line to the top of the front fender, just incase people have severely trimmed fenders.

http://lh6.ggpht.com/_MBelrZwhV6E/TC...%20measure.jpg


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