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Old 03-18-2005, 02:18 PM   #1
banta80
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Default clunking noise from rear diff

I tried to launch my car this morning while going to work. Revved to about 4500, slipped the clutch, the car didn't bog at all and just took off in one smooth but fast pull. However, i did hear a clunk from the rear differential area and noticed a little clutch smell. I'm wondering did i **** up my rear diff? bad launch?

I've never really tried to launch my car. I have ~35k on the car and maybe had about 4-5 tries as far as launching it.
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Old 03-18-2005, 03:45 PM   #2
MK19_
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Sounds typical of the rear diff "bucking" as you launched and maybe a bit of clutch slippage when you did so. Doesn't sound like a problem, IMO.
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Old 03-18-2005, 04:11 PM   #3
banta80
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*phew*


i was scared ****less in the beginning. So this is a typical sound right? I didn't mess up anything too bad other than burning the clutch a bit?
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Old 03-18-2005, 04:17 PM   #4
JayD707
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Prolly not, but dont go doing it over and over again or you will mess somthing up eventually.
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Old 03-18-2005, 04:18 PM   #5
MK19_
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Well, obviously you can tear it up- but a 4500 rpm launch is ok- as long as you aren't side-stepping the clutch. I raced (auto-x) my wagon and consistantly launched at 4500-5K RPM's and no worries at all. IMO, the key to the launch- safe for the driveline and a good out-of-the-hole start, is all in slipping the clutch just right. Do a search in this forum on launches- you'll find a lot more info.
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Old 03-18-2005, 05:21 PM   #6
banta80
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mustangkilla,

did u occassionally get the clunk that i am referring to? or when the launch is properly done, the clunk doesn't happen? thanks
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Old 03-18-2005, 05:26 PM   #7
MK19_
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Quote:
Originally Posted by banta80
mustangkilla,

did u occassionally get the clunk that i am referring to? or when the launch is properly done, the clunk doesn't happen? thanks
I got it on occasion- but as I stated- the key is to learn how to slip the clutch just right. Also, ya might want to look into STi or Kartboy mounts- the "loose" OEM ones cause a lot of "slack". Again, just my .02
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Old 03-18-2005, 11:11 PM   #8
antimullet
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I had the clunk on hard lauches Cure = DIff support crossmember bushings, Group N diff mount, and group N Tranny mount. I also have the group N engine mounts and Pitchrod.

Then I still had some wheel hop. Sti Pinks and Group N tophats fixed it all. Group N tophats help ALOT in eliminating hop. The sponginess of the stockers will cause a launch induced oscillation (ie: Wheelhop) that will break axles fast.
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