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Unread 05-19-2012, 02:44 PM   #1
76flh
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1998 TJ Wrangler 
 
Join Date: Mar 2008
Location: clinton,tn
Posts: 336
vibration after gear change

i had 488 gears put in last week. i picked it up thursday night and when i drove it home i could feel a vibration in the drive line. i called him friday morning and told him and he said to drive it some.today i checked it out and with the back jacked up, i can spin the rear wheels by hand and feel the gears meshing together and i know this is what i am feeling as the jeep rolls slowly down the street. i am going back monday after work to let the man drive it again. he said today that he didn't feel any vibration when he drove it. i think the side to side play is to tight. i had no vibration before the gear change. what is the opinion from my readers of this. thanks

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Unread 05-20-2012, 12:12 AM   #2
scubamc
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1991 YJ Wrangler 
 
Join Date: Sep 2008
Location: USA
Posts: 1,399
Did he use a master install kit and replace all the bearings?
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Unread 05-20-2012, 05:53 AM   #3
76flh
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1998 TJ Wrangler 
 
Join Date: Mar 2008
Location: clinton,tn
Posts: 336
sorry, i should have listed all he did. new master install kits, new spider gears and new axles. he used superior gears and alloy axles. all bearings and seals are new. i checked the u-joints and they are good.
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Unread 05-23-2012, 01:15 AM   #4
HandsOn
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Join Date: Mar 2005
Location: San Jose, CA
Posts: 251
Didn't do anything to change the pinion angle or ride height too, did they?
Just checking, in case there were other changes.

But by the sound of it, you've got it pegged. You should not be able to feel the "cogging" of the teeth as they mesh. Should be seamless and smooth. Like buttah...
A bad bearing can give you that chunky feeling too. And yes, it's possible to have a bad one right out of the box. It's probably extremely rare, but anything's possible.

Good luck.

Paul
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