NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #1  
Old November 24th, 2019, 18:00
mjmull mjmull is offline
NAXJA Member
 
Join Date: Nov 2019
Location: Lancaster, PA
Posts: 2
Shock measurement at full extension/compression

Hello,
I just finished the installation of a Clayton 4.5 inch long arm kit on my 2000 XJ. I did not order any shocks yet. I would like to measure for the shocks at full extension/compression of the suspension. My question, whats the best way of doing this? Thanks for any in put.
Reply With Quote
  #2  
Old November 25th, 2019, 11:24
XJlimitedx99 XJlimitedx99 is offline
NAXJA Forum User
 
Join Date: Oct 2012
Location: Milford, New Hampshire
Posts: 19
Re: Shock measurement at full extension/compression

In the front you can pull a coil out to cycle the suspension up to the bump stop using a floor jack while the Jeep is supported on jack stands under the unibody rail. Same thing for droop, just let the axle hang as far as it can (might need to have the Jeep supported pretty high). Good time to check for clearances, trim fenders, and make sure your brake lines are long enough.

I'll be watching to see if somebody has a good answer for the rear. Can't just take a spring out because then the axle will not be constrained to its path of travel. I've thought about disassembling the leaf pack and flexing the axle with just the main leaf.
Reply With Quote
  #3  
Old November 25th, 2019, 19:27
bajabronco bajabronco is offline
NAXJA Member
 
Join Date: Apr 2013
Location: los angeles, ca
Posts: 125
Re: Shock measurement at full extension/compression

Do you have a friend who has a forklift, or any business that has access to one? if so that is an easy way to test. Put forklift forks under front tire, lift it up till just before the rear tire lifts of the ground - measure, then put the forklift under the rear tire and lift and measure. - of course measure both the compressed and extended sides.
Reply With Quote
  #4  
Old November 28th, 2019, 09:58
mjmull mjmull is offline
NAXJA Member
 
Join Date: Nov 2019
Location: Lancaster, PA
Posts: 2
Re: Shock measurement at full extension/compression

Hello, thanks for replies. I lifted rear passenger tire until driver rear just came off ground and it was teetering between diver rear and passenger front. I took measurements as full extended on diver and compressed on passenger. Noticed my OEM shackles where hitting uni-body in rear. I ordered some extended boomerang shackles to install in rear, hopeful to correct that and get full flex from leafs. In front, I lifted uni-body until coils started to unload, took that as full extension. For compression in front, I did the math.

Front 26.75/16.5, Rear 24.75 14.25

Using JKS, bar pin eliminators and stem eliminators, Ordered shocks Fox 2.0 IFP, didn't need the measurements anyway with the range of 2.0s offered by Fox for the XJ. They are here, Saturdays project and lineament rack next week.
Reply With Quote
  #5  
Old November 28th, 2019, 17:21
cwyman6 cwyman6 is offline
NAXJA Forum User
 
Join Date: Aug 2014
Location: socal
Posts: 135
Re: Shock measurement at full extension/compression

That's a long shock up front hopefully left yourself half inch of wiggle room. I'm running fox 2.5 inch lift jk shocks up front with tabs welded on lower control arm mount and they are 16.6 collapsed 27.2 extended with 5in of bump if I remember right
Reply With Quote
  #6  
Old November 28th, 2019, 19:08
ehall's Avatar
ehall ehall is offline
NAXJA Member
 
Join Date: Dec 2007
Location: Southern Maryland
Posts: 9,298
Re: Shock measurement at full extension/compression

Best way is to disconnect the existing shocks (do not need to remove entirely, just unbolt the bottoms), then see how much travel you have in just the springs. Best to use a ramp or the like, but you can also use a hi-lift jack to raise a corner until the tire comes off the ground. Max compression and max extension will tell you the minimum shock travel, add an inch to both values to allow for movement under speed / force.
__________________
.
my '91 beater rebuild
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
More shock extension or compression? jeepster_259 Modified Tech Discussion 5 August 25th, 2009 15:05
rear shock mount extension..... dizzymac Modified Tech Discussion 9 February 27th, 2008 08:06
I have my ext/comp measurement know shock size mavrick Modified Tech Discussion 3 November 19th, 2007 18:47
full traction dented my shock xj joey Modified Tech Discussion 17 May 1st, 2007 20:18
shock measurement for 5" lift little red cheroke Modified Tech Discussion 0 July 10th, 2006 10:11


All times are GMT -7. The time now is 11:59.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014