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Unread 05-15-2005, 11:46 AM   #1
jeepforfree
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loud snapping noise from front end

I have read all the post and couldn't find a similar problem, I hope I didn't miss it

I have loud snapping or banging noise when in 4 high or 4 low. The noise sound like it is coming from the drivers front end but I'm wondering if the noise is radiating through the drive-line from the transfer case. The noise appears to be worse if I am accelerating or de-accelerating. It feels like the drive train is loading up and releasing with a snap like you may experience if you had different axle ratios or tire sizes between the front or rear differentials. All the axle universals and drive shaft universals are fine. I have jacked up the front end turned the pinion and the back lash is good and can't feel anything out of the ordinary when tuning the pinion. I'm wondering if it could be the chain in the transfer case jumping the sprockets? There does seem to be a lot of back lash on the front output yoke

Has anyone else experienced this before?

Thanks Doug

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Unread 05-15-2005, 12:35 PM   #2
Mr. Notorious
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I had a banging noise when the vacuum axle disconnect system wasn't working properly. The collar wouldn't always connect the shafts properly and then bang and pop outta gear. Not really a snapping noise, but a noise that might help you eliminate something... Is it at all speeds/rpms? Does the snapping happen more when you speed up?
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Unread 05-15-2005, 02:44 PM   #3
jeepforfree
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Thanks I will have a look at the vacuum axle disconnect system first.

A banging noise may describe it a little better. It does seem to do it more when I speed up. I have never gotten out of first gear, I didn't want to go any faster until I knew what was making the noise and how much damage was being done.

I see the vacuum module on the axle tube, is the gears that disengage the right axle in the axle tube or does it disengage in the Carrier near the spider gear?

Does applying vacuum disengage or engage the axle?

Thanks Doug
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Unread 05-15-2005, 03:51 PM   #4
sentinal02
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Quote:
Originally Posted by jeepforfree
Does applying vacuum disengage or engage the axle?

Thanks Doug
both. check out the FAQ sticky for more info on how it works. there's no gears in there, just a splined collar that gets pulled over by a fork. could be it's hanging over halfway so the splines are rubbing.
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Unread 05-15-2005, 10:35 PM   #5
jeepforfree
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Thanks, I read the FAQ sticky and I see the 4wd dash indicator light is switched on and off by vacuum and my 4wd light is stuck on, maybe that is a clue.

Doug
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Unread 05-15-2005, 10:57 PM   #6
sentinal02
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Quote:
Originally Posted by jeepforfree
Thanks, I read the FAQ sticky and I see the 4wd dash indicator light is switched on and off by vacuum and my 4wd light is stuck on, maybe that is a clue.

Doug
could be. but if your jeep is newer than 91 then the light is powered by a switch on the axle, not by vacuum. it could still be that the fork is over too far though.
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RIP: '88 YJ 2.5L Ax-5 NP231
Posi-Loked. Herculined. Optima yellow top. 1" Shackle, 2" BDS. Cragar 397's Aussie front.

92 YJ 4.0L Ax-15 231
5" springs, 1" shackle 31's or 35's depending on my mood
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