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Old 01-01-2008, 07:51 AM   #1
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rear axel hop

My son and I just installed 2" spacers on his 03 jeep wrangler 31x10.50 with
3.75 backset alluminum wheels this is a X jeep 4.0 automatic. the problem is under moderate acceleration the rear axle is twisting and we get a hop and some sort of metal popping. anyone with some advise?

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Old 01-01-2008, 11:54 AM   #2
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you may need to a tcase drop, or you cna make one on your on with longer bolts and with a few washers

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Old 01-01-2008, 12:30 PM   #3
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go to the hardware store and take one of the bolts of the transfer case skid out and take it in side with you for comparison so you get the right threaded bolt... buy a bag of stainless steel< only preferd for lasting longer, or washers that will fit around your bolts.
buy longer bolts to replace the factory skid plate bolts "I suggest grade 8 bolts" stronger.

It is easier to do one side of the plate at a time. dont tighten the bolts all the way down until you get both sides in.

AS for how many washers to use that will be buy trial and error no jeep is the same.

you also have the opion of installing a "MML" motor mount lift. this also is not hard to do but is sugguested you also install a 1' body lift.


good luck gotwood03
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Old 01-01-2008, 01:35 PM   #4
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Thanks for the info. We will give it a try. Do you think a 1/2" drop to start or a 1"? I thought i would make spacer in my machine shop rather than use washers.
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Old 01-01-2008, 01:44 PM   #5
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wierd I installed a 2'' spacer and had no issue, one the same model jeep
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Old 01-01-2008, 04:26 PM   #6
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Quote:
Originally Posted by bpowa View Post
wierd I installed a 2'' spacer and had no issue, one the same model jeep
so did I .... some jeeps are fine but some require spacers for the trans case skid plate also.

If you have a D35 you are more appted to not have to use the spacers for t/case skid with a bb. If you have a D44 it is more common to use spacer even just with a bb due to drive shaft length but then again some do and some dont require spacers.



GOTWOOD ....

If you have the ability to machine the spacers instead of using washers is great! Again as for to size of the spacer that is still trial and error. I know they are not hard to make so "just my opion" would make a set of 1/4 inch , 1/2 inch set and 3/4 inch set then put just the 1/4 inch set in and if that dont help go to the next set.

hope that helps.
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Old 01-01-2008, 05:52 PM   #7
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I did a t-case drop using the stock bolts and it was fine. It eliminated any vibes, but I have since removed the t case drop because I did the 1.25" BL with 1" mml.
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Old 01-01-2008, 05:57 PM   #8
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or he could od it with washers to see how much he needed and then make a good spacer
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Old 01-01-2008, 06:15 PM   #9
coilovers are damn flexy
 
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Sorry, but you are all wrong!!!!!!!!!!!!!!!!!!!!! A t-case drop has nothing to do with the axle hopping, or twisting. What is probably more likely to be the problem, is a upper, or lower control arm, being loose. Check everything connected to your rear axle (please note the correct spelling) and you will be all set. A t-case drop is only for drive shaft vibration problems, usually associated with 3" and above suspension lifts. Oh the vigor of youth.............
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Old 01-01-2008, 06:28 PM   #10
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with only 4 washers my problems were gone after installing the 2" BB last year.
pic: http://runicon.de/viewer.php?albid=4...e=3&imgid=3592
the funny thing is that i didnīt need to drop the TC more with my actual 4.5" lift...

on a friends TJ the track bar rubbed at the gas tank skid after adding a 2 BB. that made a metal sound.
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Old 01-01-2008, 06:30 PM   #11
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Quote:
Originally Posted by bluvikng View Post
Sorry, but you are all wrong!!!!!!!!!!!!!!!!!!!!! A t-case drop has nothing to do with the axle hopping, or twisting. What is probably more likely to be the problem, is a upper, or lower control arm, being loose. Check everything connected to your rear axle (please note the correct spelling) and you will be all set. A t-case drop is only for drive shaft vibration problems, usually associated with 3" and above suspension lifts. Oh the vigor of youth.............
He is right why would you think a tcase drop would have anything to do with axle rap or hop.
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flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 01-01-2008, 06:32 PM   #12
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Quote:
Originally Posted by 4.0l sahara View Post

He is right why would you think a tcase drop would have anything to do with axle rap or hop.
Why would the controls arms be loose from a spacer lift? Control arms should not have been touched during install.
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Old 01-01-2008, 06:38 PM   #13
coilovers are damn flexy
 
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Stick with what you know, mr. grill...........
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Old 01-01-2008, 06:46 PM   #14
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they could of ben loose and the lift made it noticible.
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 01-01-2008, 06:48 PM   #15
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I guess, what about adjusting the rear track bar?
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Old 01-01-2008, 06:53 PM   #16
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I don't think a offset axle would cause that but i'm not 100% sure.
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flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 01-01-2008, 06:58 PM   #17
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after installing my 2" BB with the stock track bar my tires rubbed at the spring carrier when flexing. that also made a metal noise. after installing a rear trackbar bracket that was gone. now with my new rims (other backspacing) that wouldnīt be a problem.
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Old 01-01-2008, 07:05 PM   #18
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Quote:
Originally Posted by gotwood03 View Post
My son and I just installed 2" spacers on his 03 jeep wrangler 31x10.50 with
3.75 backset alluminum wheels this is a X jeep 4.0 automatic. the problem is under moderate acceleration the rear axle is twisting and we get a hop and some sort of metal popping. anyone with some advise?
ok then lets see if we can narrow your problem down more.......

are you positive that it is wheel hop?

does it seen that you have "wheel hop" or "drive line vibration" under moderate acceleration?

is this "problem" from a stopped position and once you get to higher speeds it goes away?

As for the "popping" look to see if the springs are correctly seated in the purches ///look at your sway bar links to see if they are still good or if they have come loose "where the rubber is on the swaybar link" easy way to tell is pick up and push down on the front bumper and listen.if you here clunking or popping it is probally the sway bar links////// look to see if the rear track bar has made contact with the gas tank skid///////retighten every bolt you touched.////look at the rear drive shaft wear the ujoints are...does it look like the drive shaft U has mad contact with the trans case yoke U or the rear axle yoke U.

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Old 01-01-2008, 07:13 PM   #19
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with your bb you got shocks too right? I'd check those first. Remove the rear shocks you got and swap the rear stockers in and give it a test drive.

My axle hopped when i removed the rear shocks just to give it a test drive.

if not then check your control arm bolts and bushings.

The popping only occurs when you get the wheel hop? how about during regular holes in the streets?
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Old 01-03-2008, 06:17 AM   #20
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The problem is only from a stop. under moderate to hard acceleration. I am afraid to try hard!!! the rear wheels definitely are hopping and if you accelerate with any more force there is a popping sound. I have not seen any wear marks on the drive shaft yokes allthough it does look from the angle that a tcase drop would help some. I dont believe that this is my main problem. The idea of the rear wheels rubbing on the track bar is a possibility
I had a heck of time getting it back in place after I installed the spacers. But I do not see any tire wear, I will look closer. As far as shocks they are the stock ones, do they need to be longer my intructions did not say so? as far as worn parts the jeep has only 58K looks to be in good shape.

Thank you all for the input

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