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Author Topic: Pinion angle, ride quality, tire pressure, homemade shackles :D  (Read 7515 times)

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Offline murray195

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Pinion angle, ride quality, tire pressure, homemade shackles :D
« on: February 15, 2011, 03:54:41 PM »
Hello all,
Well, while I wait for my AMC 360 to arrive from BC I figured I could attempt to address a slight issue I'm having with my YJ. On acceleration from a stand still for maybe 3 or 4 seconds she gets a little hoppy  :P. From what I understand, this is due to me not running a SYE. I have a RC 4" lift with the TC drop. I've been reading up on shims vs. shackle lifts to get me to the 2 degrees that everyone says I should have. So here's my questions:
1) are the shims my new leaf packs came with sufficient?
2) would extended shackles change my driveshaft angle for the better? (I need to replace them anyways)
3) would lowering the TC another 1/4" reduce the hoppy hop hop?
4) could everything be fine and its actually engine/trans/transfer case mount related?

I don't have any prominent vibrations at high speeds, and don't have any after that 3-4 second mark either. Thanks guys!
« Last Edit: February 17, 2011, 04:50:40 PM by murray195 »
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Offline cLAY

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Re: Pinion angle question
« Reply #1 on: February 15, 2011, 06:00:13 PM »
Hoping is caused by axle wrap and won't be solved by a SYE or driveshaft angle adjustment.

If you think its bad now wait till the V8 is in!

Do you have any lift blocks? If so those will need to go. Otherwise stiffer springs or a traction bar maybe needed.
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'93 ZJ, 5.2L, lifted/locked/36s..<gone>
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Offline murray195

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Re: Pinion angle question
« Reply #2 on: February 15, 2011, 06:48:17 PM »
 :-\ Well thats no good... my lift is MAYBE 4 months old and no lift blocks were used. I used the track bar relocation bracket for the front and reinstalled the factory track bar. She rides like a school bus haha! So, going stiffer would be the closest thing to having the axle bolted directly to my frame.

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Offline murray195

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Re: Pinion angle question
« Reply #3 on: February 15, 2011, 09:04:50 PM »
Is there anything else it could be?
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Offline JackstandJohnny

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Re: Pinion angle question
« Reply #4 on: February 15, 2011, 09:10:38 PM »
track bars and traction bars are different things ;)  you can ditch your track bars that'll help with the harsh ride;  and don't over tighten your shackles: 

are you runnin the leafs under your diffs?  shouldn't be so bad.....
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Offline vantagetes

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Re: Pinion angle question
« Reply #5 on: February 15, 2011, 10:09:05 PM »
Taadaaaaaa, just happened to be looking at this while I was researching some part numbers for my TJ.

http://www.mountainoffroad.com/_e/Trac_Bars_Traction_Bar/product/TB500/TB500_Traction_Bar_for_Rear_Axle_CJ_7_and_YJ_s.htm
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Offline rangerdanger

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Re: Pinion angle question
« Reply #6 on: February 15, 2011, 10:26:26 PM »
The Rough Country lift is your first problem, I bought one of those pieces of crap and bent the rear springs the first trip out, V8 + cheap springs = bent stuff. Also if you torqued the bolts to their specs your bushing are probably binding and causing your hop. Do yourself a favour and ditch the Rough Country stuff, its cheap for a reason
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Offline murray195

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Re: Pinion angle question
« Reply #7 on: February 16, 2011, 08:44:37 AM »
Johnny C, thank you for clarifying that there is a difference b/t track and traction bars.  I'm running leafs all the way around. Maybe I should loosin up my shackles a little.vantagetes, thanks for the link. I was looking at something similar before:

And here I was thinking I'd never need anything like it with a mild build lol.

rangerdanger, other than being a little bumpy The Rough Country Lift has been excellent. It's held up very well with no collateral damage. If I go with a shackle lift with new bushings, could this help a little? The Traction bar looks like something a could build when I get some ME time lol. Thanks again for the replies guys!
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Offline JackstandJohnny

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Re: Pinion angle question
« Reply #8 on: February 16, 2011, 09:15:24 AM »
generally a traction bar is only needed in SOA applications as axlewrap is when that becomes a problem.  if you're running spring under, it shouldn't be a problem.... mine isn't at least!

ditch the track bars;  CJs didn't come with them, they aren't much different than YJs are they???

 and loosen your shackle mount bolts. mine are so loose you can almost turn em by hand ;)  makes the ride much better.  (i think its less than 20 ft lbs)  i'd also go with some aftermarket shackles with greasable bolts;  well worth the 200$ to upgrade (Rubicon express and a bunch of others have the greaseable bolts) 

but as clay said, that won't fix your hop. 

try softening your suspension, maybe your hop is just new springs with tight shackles???????

if its still there, traction bars are a possibility, but if ur jeeps already ridin' like a dumptruck, it won't make a huge difference in ride quality/flex
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Offline murray195

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Re: Pinion angle question
« Reply #9 on: February 16, 2011, 09:51:19 AM »
Ok JohnnyC, I'm gonna loosin up those shackles today if I get a chance. I'm SUA and don't plan on changing it till I upgrade my diffs. I'll look into those greasable shackles as well. Maybe I'll give national a call after lunch. I think you guys are onto something with those shackles. My jeep having ride quality :o?!?! Is there really such a thing in a YJ?  :P
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Offline JackstandJohnny

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Re: Pinion angle question
« Reply #10 on: February 16, 2011, 10:05:40 AM »
Quote from: murray195 on February 16, 2011, 09:51:19 AM
My jeep having ride quality :o?!?! Is there really such a thing in a YJ?  :P

yes: but you still won't be able to keep up to those silly boys with their coils when they baha it at Waiparous.......
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~ rescue green JKUR on 35s.  typical rubicon build

Offline murray195

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Re: Pinion angle question
« Reply #11 on: February 16, 2011, 10:23:54 AM »
Haha, true... maybe one day a TJ will be in my driveway. Until then all I can do is improve my YJ right?  ;D
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Offline fug

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Re: Pinion angle question
« Reply #12 on: February 16, 2011, 10:44:00 AM »
Quote from: JohnnyC on February 16, 2011, 10:05:40 AM
yes: but you still won't be able to keep up to those silly boys with their coils when they baha it at Waiparous.......

I kept up pretty well in my YJ... and I still have my trackbars too ;)
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Offline vantagetes

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Re: Pinion angle question
« Reply #13 on: February 16, 2011, 12:16:00 PM »
Ah silly boys and their YJs, always trying to keep up with the TJs  :P
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Offline murray195

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Re: Pinion angle question
« Reply #14 on: February 16, 2011, 12:51:55 PM »
c'mon now lol
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