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  #1  
Old February 22nd, 2007, 15:21
cdhowell cdhowell is offline
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Strange noise after gear Install

After going to 4:56 from 3:07 I have a strange, almost harmonic noise that comes in and out, about 70 mph. It seems to be in the rear but hard to tell. Quick Details, 97 Xj 8" Skyjacker lift, Tera SYE, 5-speed AX 15 I think Running 33's. Tru-trac front HP 30, open 8.25 rear. Noise is not steady ,but has a constant rythem. Hard to describe sounds. Maybe it was always there but did not see enough rpm in the drive train till the gear swap. Any Ideas?
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Old February 22nd, 2007, 15:45
cdhowell cdhowell is offline
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Re: Strange noise after gear Install

any one
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Old February 22nd, 2007, 15:53
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jpcherokeekid jpcherokeekid is offline
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Re: Strange noise after gear Install

did you do the gears yourself? ive been told that if your gear patern and backlash are not set correctly (within a few thousandths) you will get noise and once it starts making noise it won't stop unless you change your gears out again.
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Old February 22nd, 2007, 16:35
Stumpalump Stumpalump is offline
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Re: Strange noise after gear Install

Your drive-shaft is spinning a lot faster now and that could be your problem. Drop one at at time and see if the noise goes away.
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Old February 23rd, 2007, 08:16
cdhowell cdhowell is offline
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Re: Strange noise after gear Install

Yes I did the gears myself, and I am not new to gear installs. Pinion depth is set to spec on gear set and backlash at .007 calls for .005 - .009 A friend with a TJ is going thru the same thing at 70 mph. also running 4:56 and 33's . His is a D35 rear
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Old February 23rd, 2007, 11:32
Absdad Absdad is offline
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Re: Strange noise after gear Install

I'm having the same issue. Went with 4.56's and running 32's with my RPM's about 2900 at 70. I took the front ds out and it didn't make the sound go away. I also have a slight vibration at that speed. My rear ds is pretty dented up so it could be that.

I attribute it to the higher RPM's.
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