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Old 04-14-2011, 06:46 AM   #1
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extreme shaking / vibration on take off???

before my 2.5" lift was installed the jeep drove great from a stop and now since i have installeld the 2.5" RC lift i have this extreme vibration / shaking during take off from 1st gear. the shifter and whole tranny shakes and is very bad on incline. it smoothes out after you get into 2 or 3rd gear but from a stop its pretty bad. i read somewhere here about a similar thing and he replaced the torque arm. looked at his picture and i cannot find anything on my jeep that looks similar or cannot see where anything would be missing? anyone have any ideas? U joints are all tight.

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Old 04-14-2011, 08:27 AM   #2
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Check trans mount might be bad

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Old 04-14-2011, 08:56 AM   #3
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im guessing it is rear pinion angle? when you put lift in did you have spacers
for the transmission mounts (Cross member)?
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Old 04-14-2011, 09:20 AM   #4
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thanks guys. i dropped the tc about 1" using washers. i will be putting in 1.2" - 2" full steel drop on this weekend. i looked at the tranny mount and it looks torn. hoping thats is. thanks.
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Old 04-14-2011, 10:46 AM   #5
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make sure your allignment is dead on as well.
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Old 04-18-2011, 11:46 AM   #6
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ok i replaced the tranny mount which was torn pretty bad. also found that the torque arm busing was compleltly missing. to get my by i used a 9/16" grade 8 bolt and a shock absorber busing with a some washers. it seems to work a little bit but still shakes during the take off. i will order the correct bushing as the shock bushing is very soft.
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Old 04-18-2011, 11:54 AM   #7
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Sounds to me like the pinion angle. The pinion kit is about 25-30 bucks and an easy job. But ya might wanna check all the other bushins as well
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Old 01-18-2012, 09:57 AM   #8
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Sounds to me like the pinion angle. The pinion kit is about 25-30 bucks and an easy job. But ya might wanna check all the other bushins as well
you were right all along! i took the 6* shim out of the springs and whalllaa rides nice and smooth now.
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Old 01-18-2012, 11:05 AM   #9
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6* was way too much for only a 2 1/2 half inch/ I had 2 inch on mine and no vibes. Probably a 2 or 3 degree woulda been perfect.
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Old 01-19-2012, 06:32 PM   #10
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6* was way too much for only a 2 1/2 half inch/ I had 2 inch on mine and no vibes. Probably a 2 or 3 degree woulda been perfect.
Seems fine with no shims. I think I am at 8* and 10*. 10 being the pinion and to get it exact I think I might need a cv shaft. Don't want to spend the $$ . Do you think I will do any damage keeping it within 2* of each other?
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Old 01-20-2012, 01:38 AM   #11
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I never used shims on my 2 inch and was fine. I dont see where another half inc would make a huge difference. And no I dont think it matters if front and rear are the same angle. They were different from the factory because of positioning and different length driveshafts front and rear.
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Old 01-20-2012, 09:33 AM   #12
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Quote:
Originally Posted by yeaup-yeaup

Seems fine with no shims. I think I am at 8* and 10*. 10 being the pinion and to get it exact I think I might need a cv shaft. Don't want to spend the $$ . Do you think I will do any damage keeping it within 2* of each other?
That's right where you want it. Under power the pinion will rotate up a bit putting them closer to the same angle.
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Old 01-20-2012, 01:38 PM   #13
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That's right where you want it. Under power the pinion will rotate up a bit putting them closer to the same angle.
noted however under power the pinion side of the rearend flexes up and such making my pinion angle more like 12* and the TC staying at around 8*. I am only asking cause i dont want this to create any un-necessary strain on the driveline. i guess maybe by taking out my tc drop and bringing the tc back up this might get her closer to 100%. i think with a stock driveshaft you want the tail shaft and pinion on a parrell meaing both at the same angle or within 2*.

i duno - i think i read somewhere - the more you try to understand the more confused you get! starting to believe this more and more.
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Old 01-21-2012, 11:44 PM   #14
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Ah, I gotcha now. I was thinking angle to the drive shaft, and you were talking angle to level.

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