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  #1  
Old 10-24-2010, 03:46 PM
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Drive shaft with 6 inch lift

I have a six inch lift on my WG and have a bad shake at low speed. Someone says I probably have a unbalanced shaft. Should I get a high angle drive shaft with a six inch lift?
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Old 10-24-2010, 05:01 PM
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Also could be bad pinion angle
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  #3  
Old 10-24-2010, 05:23 PM
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Probly just want to change your ujoints, theyve been at one angle for who knows how many years and now theyre at a very different angle
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  #4  
Old 10-25-2010, 02:02 AM
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IMHO u-joints need replaced. IF you didnt compensate your lift by changing the pinion angle you need to.
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  #5  
Old 10-28-2010, 03:35 PM
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Well I replaced the u joints and had the drive shaft balanced. I still have the vibration at low speed any thoughts? Im starting to think its the motor not running right. Also when I was trying to see what was wrong mhy back driver brake doesnt work at all so now I have that to mess with to.
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3 inch body lift. Oh Christ where are you floor pans at....
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  #6  
Old 10-28-2010, 03:59 PM
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Get some manual lockout hubs. That way you can just stop the front driveline from spinning...

Do you have an angle finder? If so what angle is your shaft at?
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  #7  
Old 10-28-2010, 04:01 PM
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Oh wait... Do you have the crappy QT? If so Im gonna guess that they have a VC. If so, I dont think you can put manual hubs on it...

I dont know much about QT's though. Other than that they suck and all of them Ive had break...

BTW, opinions vary on that case so dont take it to heart...
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  #8  
Old 10-28-2010, 04:02 PM
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I agree. I have stock setup with 6" lift and put a wedge under the springs for pinion angle, but I do have a very small vibration at 20mph, but its not anything major at all.

If you are having major vibrations, do the rest of the checks the others have mentioned, but with a degree wedge, you shouldn't have major issues.
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  #9  
Old 10-28-2010, 04:34 PM
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Yep wedge was applied. I have lockouts and no QT, someone just suggested the front drive axel u joints. Does that make sense to anyone. If so I guess I'll start digging into that part. I put the rear on stands and let it run and no vibrations so it may be in the front.
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1988 Burgundy Waggy named Garthok
6 inch Rough Country Lift, 35's.
3 inch body lift. Oh Christ where are you floor pans at....
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  #10  
Old 10-28-2010, 04:43 PM
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If you already have lock outs and you still have vibration with them unlocked, then its not the front shaft. It shouldnt even be spinning while driving.

But yeah, its always a good idea to replace the old factory U-joints.
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  #11  
Old 10-28-2010, 07:46 PM
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Is this a new lift? Here's a few things I would check:

-I'd check the torque on all the bolts and take a look at the bushings.
-Lug nuts all tight?
-Maybe you threw a weight or maybe have a flat spot on one of the tires.
-try rotating your tires front to back in an "X" and see if anything changes or feels different.

Where is the vibe felt? I noticed I had a lot of vibes in the column when my caster was out.

-With the U-joints, it would be a good idea to make sure you have new ones all around anyway. And get a couple spares as a precaution to keep in your tool bag.
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  #12  
Old 10-28-2010, 07:57 PM
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Here we go again, lol

Quote:
Originally Posted by Dmntxn77
Oh wait... Do you have the crappy QT? If so Im gonna guess that they have a VC. If so, I dont think you can put manual hubs on it...

I dont know much about QT's though. Other than that they suck and all of them Ive had break...

BTW, opinions vary on that case so dont take it to heart...
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  #13  
Old 10-28-2010, 08:29 PM
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If my engine was not running right or missing out it shake like that? I cant really tell where the shake is coming from. Its not in the steering wheel. We both u joints on rear drive shaft. If i roll down hill with my foot off it rolls smooth then when i hit the gas all hell breaks loose. Sorry Im trying to trouble shoot in between posts. Ill PO'ed at the whole thing so I'm quiting for the night. Maybe tomorrow will be a better day. BTW thank you everyone for helping me its greatly appreciated.
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1988 Burgundy Waggy named Garthok
6 inch Rough Country Lift, 35's.
3 inch body lift. Oh Christ where are you floor pans at....
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  #14  
Old 10-28-2010, 08:39 PM
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I don't think an engine issue would make your truck shudder that much to where "all hell breaks loose". You'd know it if you rev it in park. Do your front wheels shake side to side when you feel it? Is this a "vibe" or an "Oh crap I'm gonna crash" death wobble?
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Military guys- Check out www.MilitaryJeepers.com

'89 GW deceased
Ford 4spd swap Np435/205
Lifted/stretched on 36's/4.10 thick gears/spooled rear

'86 CJ-7 Renegade, Restored, original steel.
new Built TBI 258/Np435/D300 twin-sticks/Waggy D44's
37" Super Swampers and lots of goodies!
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  #15  
Old 10-28-2010, 08:53 PM
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Front axle u-joints will not cause your problem. What changes did you make to your rear driveshaft?

There is no reason to change a u-joint because it's old. Maybe piece of mind...? You're wasting money if they're in good working order.
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  #16  
Old 10-28-2010, 08:58 PM
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^^^
I was thinking rear shaft too Casey but he said he put the rear up on stands and no vibes.
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ROMANS 12:1-2

Military guys- Check out www.MilitaryJeepers.com

'89 GW deceased
Ford 4spd swap Np435/205
Lifted/stretched on 36's/4.10 thick gears/spooled rear

'86 CJ-7 Renegade, Restored, original steel.
new Built TBI 258/Np435/D300 twin-sticks/Waggy D44's
37" Super Swampers and lots of goodies!
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  #17  
Old 10-28-2010, 09:04 PM
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It will act differently with a load.
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Quote:
Originally Posted by Jeepstress
"Go forth and be a tool".

Quote:
Originally Posted by 78 Wagoneer
This year for ECI I got a Jeep. Pretty important upgrade.
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  #18  
Old 10-28-2010, 09:06 PM
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Quote:
Originally Posted by Casey
Front axle u-joints will not cause your problem. What changes did you make to your rear driveshaft?

There is no reason to change a u-joint because it's old. Maybe piece of mind...? You're wasting money if they're in good working order.

Your right, there is no reason to replace a perfectly good part...

Of course, you would have to take them out to know if they are in-fact a perfectly good part...

Personally though, I like to carry a spare and Im not going to buy a new one to keep in my rig. Instead, I will replace the old one, and carry that one as a spare.

Maybe its a waste of time, but hey, to each their own...
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  #19  
Old 10-28-2010, 09:09 PM
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BTW, regardless what you do with your U-joints, I really doubt this problem is being caused by one...

What kind of tires are you running?
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  #20  
Old 10-28-2010, 09:15 PM
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I carry spares. New ones.

Tires are also top on the list of things to check.
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Quote:
Originally Posted by Jeepstress
"Go forth and be a tool".

Quote:
Originally Posted by 78 Wagoneer
This year for ECI I got a Jeep. Pretty important upgrade.
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