Whumwhumwhumwhum noise after 4.083 gear upgrade?
06-06-2009, 02:47 PM
#42
People run those gears fine with the proper oil weight. You shouldnt use thicker oil to mask the problem. That will eventually just lead to more problems. Sucks, and it might cost you more money but it doesn't sound like the shop did the proper install.
06-06-2009, 05:33 PM
#43
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Way to **** up an intelligent thread douchebag.
People run those gears fine with the proper oil weight. You shouldnt use thicker oil to mask the problem. That will eventually just lead to more problems. Sucks, and it might cost you more money but it doesn't sound like the shop did the proper install.
People run those gears fine with the proper oil weight. You shouldnt use thicker oil to mask the problem. That will eventually just lead to more problems. Sucks, and it might cost you more money but it doesn't sound like the shop did the proper install.
by the way genius, you didn’t add anything to the thread that hasn’t already been said - which is total common sense anyway.
06-09-2009, 10:44 AM
#45
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Bump from the dead. Same issue as yours frizille. Shop even took it apart a second time and re-shimmed it and it did not improve very much at all. Same decel noise just like yours but I also notice a pretty pronounced clunk when shifting 1-2. Shop blames it on the solid bushings. Did this issue ever get resolved??
4.08/Quaife/SPL bushings
4.08/Quaife/SPL bushings
Doing searches I found this on Google. Based on the noise I would think that it is something to do with the carrier bearings. When I dip below 20mph it goes away. Now that I've driven it for 2000 miles, I can pick out some different noises:
- there is a whirrrr noise under heavy acceleration - I believe that is the gears and the "high strungness" of them making noise which would indicate the lash is just slightly loose (but still within spec). Note, 'tight = more heat' and I track the car so not overly worried about it being on the loose side.
- there is the whumwhumwhum noise which is the most annoying and is on the video. That I believe is the pinon or carrier bearings based on the below. A side note, when the car is on the lift and you take it up to 70mph there is no noise from the diff at all. Only when the car is on the ground and pressure applied to the axles/tires/suspension does the noise manifest itself. That leads me to believe its got something to do with the bearings as they can spin freely without any force pushing on them as they spin.
(http://www.ringpinion.com/FAQ.aspx#38)
What is this whirring noise?
Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears.
A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up.
Rumbling or whirring at speeds over about 20 mph can be caused by worn carrier bearings. The noise may change while turning.
Regular clunking every few feet may indicate broken ring or pinion gears.
Banging or clunking only on corners can be caused by broken spider gears, lack of sufficient positraction lubrication, or worn positraction clutches.
Rumble while turning may indicate bad wheel bearings.
A steady vibration that increases with the vehicle’s speed can be caused by worn u-joints or an out of balance driveshaft.
Clunking only when starting to move or getting on and off the gas might be loose yokes, bad u-joints or worn transfer case or transmission parts.
I'm really tempted to replace the whole pumpkin and start over but I blew my funds on the first two rebuilds and cash is tight (sucks when that happens). So in the mean time I drive it with the music very, very loud and pretend it isn't there - at some point I'll get frustrated enough and try to fix it myself, for better or worse.
-- friz
Last edited by frizille; 06-09-2009 at 10:54 AM.
06-09-2009, 10:49 AM
#46
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i have solid bushings, 4.083, and cusco lsd. i don't have any clunk. i installed my gears myself. im just starting to get a whine myself. but this was all installed in my 03 differential that has about 100k miles on it now and presently in my 08. i did not replace the bearings so im sure thats all mine is. i did tighten the crush sleeve to tight when putting it back together so im sure the extra load is what has caused my pinion bearing to make the whine. all though they are getting the right measurements are they sure they didn't over tighten the crush sleeve also?
06-10-2009, 06:07 AM
#48
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Are there any issues with draining fluid, then taking the back diff cover off while the pumpkin is on the car? Might open up the case when I drain the oil this weekend and look around.
07-13-2009, 06:27 PM
#49
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Finally got under the car to look at stuff. One thing I noticed, and I don't have the knowledge to say if this is bad or not so someone chime in, is where the driveshaft and pinion meet there is about 1mm of deflection and play when I spin the driveshaft back and forth. I made a quick vid, look in the 10 o'clock position and you can see the play as I spin the drivetrain back and forth with my hand. Car is in neutral with the parking brake off.
http://www.youtube.com/watch?v=JJUMCE89rpw
Thoughts?
http://www.youtube.com/watch?v=JJUMCE89rpw
Thoughts?
07-13-2009, 08:10 PM
#51
Finally got under the car to look at stuff. One thing I noticed, and I don't have the knowledge to say if this is bad or not so someone chime in, is where the driveshaft and pinion meet there is about 1mm of deflection and play when I spin the driveshaft back and forth. I made a quick vid, look in the 10 o'clock position and you can see the play as I spin the drivetrain back and forth with my hand. Car is in neutral with the parking brake off.
http://www.youtube.com/watch?v=JJUMCE89rpw
Thoughts?
http://www.youtube.com/watch?v=JJUMCE89rpw
Thoughts?
Has the whine gotten any louder? Or is it hard to tell? If you want me to drive it again, stop by.
07-14-2009, 06:21 AM
#52
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It's gotten louder, and now has a clunk to it - I can crank the stereo up all the way and still hear it. Will setup an appt to let you drive it Sharif.
07-14-2009, 06:31 AM
#53
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That puzzles me too. Don't think its tires or wheels - I've had 2 sets of tires on there, 2 different rims with the same results. Maybe suspension... ?
07-28-2009, 06:12 PM
#55
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Yeah ... I found a place that will sell me a used stock pumpkin, gears, seals, etc for $475 shipped. (lol?)
On a serious note, took it back over to Sharif last week and he drove it. Somethings not right; best thing we can think of is 2 things:
- the front diff aluminum SPL bushings I replaced the stock bushings with push the driveshaft out of alignment. I'm going to go back to stock bushings and see if that fixes anything. Looking under the car, the stock bushings are maybe 1/4" thick. The SPL ones are 1/2" thick (top and bottom) and don't compress like the stock rubber ones do so I've got a 1/2" angle difference. I know people have no problems with the SPL mounts - at this point I'm just trying to figure out what it is and that's a differentiation from other cars without the problem.
- the pumpkin case itself is allowing some movement internally where it shouldn't. I've read of a few other people with this phenomenon via the Google. Maybe I'm special?
So plan is to replace bushings, test drive, then replace pumpkin. BTW - those front diff mounts are F-ing expensive from the dealer; $64 x4 + $12 for the insulators x2 = $280 total.
Will update if/when I get around to it... probably won't be for a couple weeks.
friz
On a serious note, took it back over to Sharif last week and he drove it. Somethings not right; best thing we can think of is 2 things:
- the front diff aluminum SPL bushings I replaced the stock bushings with push the driveshaft out of alignment. I'm going to go back to stock bushings and see if that fixes anything. Looking under the car, the stock bushings are maybe 1/4" thick. The SPL ones are 1/2" thick (top and bottom) and don't compress like the stock rubber ones do so I've got a 1/2" angle difference. I know people have no problems with the SPL mounts - at this point I'm just trying to figure out what it is and that's a differentiation from other cars without the problem.
- the pumpkin case itself is allowing some movement internally where it shouldn't. I've read of a few other people with this phenomenon via the Google. Maybe I'm special?
So plan is to replace bushings, test drive, then replace pumpkin. BTW - those front diff mounts are F-ing expensive from the dealer; $64 x4 + $12 for the insulators x2 = $280 total.
Will update if/when I get around to it... probably won't be for a couple weeks.
friz
07-28-2009, 06:45 PM
#56
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god, cant even tell you what an upset this thread is, i was literally abuot to buy these 4.083 gears for my g coupe tomorrow. but it sounds like i have a very high chance of having issues with them. do the 3.9 gears do this as well? does everyone who gets the 4.083 gears get this issue? im not a rich guy so i cant afford to throw more money into fixing things like this.
07-29-2009, 08:31 AM
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god, cant even tell you what an upset this thread is, i was literally abuot to buy these 4.083 gears for my g coupe tomorrow. but it sounds like i have a very high chance of having issues with them. do the 3.9 gears do this as well? does everyone who gets the 4.083 gears get this issue? im not a rich guy so i cant afford to throw more money into fixing things like this.
I'd say go for it - you'll probably be just fine.
Last edited by frizille; 07-29-2009 at 09:28 AM.
07-29-2009, 08:35 AM
#59
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BTW - I changed out the 140w oil and put in some Mobil 1 75w90 last week. When I drained the old oil with ~3100 miles on it it came out black with a good bit of metal on the magnet, if you scrapped it off it would be about a tablespoon full. Was the most metal I've seen on the diff plug in the 4-5 diff oil changes I've done on the car when it was stock.
08-25-2009, 10:36 AM
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Just a quick update - I ordered a new pumpkin w/ stock everything (used from an 06). I plan to drop the current pumpkin off and then bolt on the used stock pumpkin and see if it magically goes away. If so, I'll disassemble the 4.083 pumpkin and take some pictures. I've got a couple days off this week so am going to attempt it Thurs/Fri.