whining gears
03-20-2009, 08:43 AM
#11
Join Date: Feb 2009
Location: Texas
Posts: 8
@ least he came through w/an opinion. Don't really pertain to this guys problem but what can ya do. Also when you drop the diff cover, slide your hand along the bottom like your sifting for gold. If there's shavings, its gonna blow soon or later & that's a bad feeling. Keep us posted
03-20-2009, 12:40 PM
#12
4th Gear Member
Join Date: Jun 2007
Location: Ohio
Posts: 1,996
@ least he came through w/an opinion. Don't really pertain to this guys problem but what can ya do. Also when you drop the diff cover, slide your hand along the bottom like your sifting for gold. If there's shavings, its gonna blow soon or later & that's a bad feeling. Keep us posted
Still waiting on an explanation from ackuric......
03-20-2009, 12:53 PM
#13
4th Gear Member
Thread Starter
Join Date: Feb 2007
Location: Austin, TX
Posts: 1,139
I'm w/Black35th bro,you don't put a drag rear in a street car & most drag friends of mine can slap a gearswap & be back on the track in no time. May not be perfect but it'll hold a run or two. Any street gear when set "correctly" will hummm like a charm but not whine. Back to the question: 1st off always use friction modifier! 2nd, when was the last time you dropped your shaft? If you didn't mark it & jacked the bolt pattern up there's a problem that could have a minimal effect on your input shaft so be careful not to damage any worse. This could damage more. Here 2 options. 1/Easiest way out, have it drained look @ the gears check for fractures & a decent pattern. If all looks good, look inside & spin 1 wheel, look closely @ the spider gears. If they're chipped hit me back asap. Your in some crap. If you see nothing make it thick as all hell & pray for the best. Option 2: anytime you reset the gears it changes the tooth pattern weakening the gear. You need FRPP 4.10's w/bearing kit & Royal Purple. If needed get a matching diff for about 40 bucks for back up.
The driveshaft has never been disconnected from the car so I don't think that could be a problem. Any chance I messed something up when I installed upper and lower control arms? I only had one disconnected at a time so I don't see how I could have messed anything up but that bad vibration never happened before I put them in. I did all my suspension at that time also so who knows what caused it. That's why originally I said I wasn't sure that it was from the gears.
I'm going to change the fluid on Sunday and I'm going to use two bottles of RP 75w90 and a bottle a friciton modifier. Is that what you would suggest? I used the two bottles last time but no friction modifier. I'll check for shavings and take some hi-res pictures of the gears and maybe post them up if I'm unsure of potential damage.
Is you gear guy at the Planet Ford in Houston by chance? My parents live in Houston so that is an option if I need to have someone good look at it. The mustang performance shop I had in mind here just recently closed its doors due to hard times.
03-20-2009, 02:38 PM
#15
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Thread Starter
Join Date: Feb 2007
Location: Austin, TX
Posts: 1,139
That is a really good point. I never even considered that. I changed all the control arms and left the stock springs in there. I was going to cut at least the dead coil out but I never did. Could it be off enough to cause the vibration? Would shortening the springs a little set it back into a good position? Lots of people do fixed upper control arms and dont have this problem so I can't see how I would have to put the stock ones in to make it right. Cutting my springs a little is no big deal but I'm not going to bother if that wont have an effect on the pinion angle.
03-20-2009, 04:34 PM
#16
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Join Date: Sep 2008
Location: tn
Posts: 0
The driveshaft has never been disconnected from the car so I don't think that could be a problem. Any chance I messed something up when I installed upper and lower control arms? I only had one disconnected at a time so I don't see how I could have messed anything up but that bad vibration never happened before I put them in. I did all my suspension at that time also so who knows what caused it. That's why originally I said I wasn't sure that it was from the gears.
I'm going to change the fluid on Sunday and I'm going to use two bottles of RP 75w90 and a bottle a friciton modifier. Is that what you would suggest? I used the two bottles last time but no friction modifier. I'll check for shavings and take some hi-res pictures of the gears and maybe post them up if I'm unsure of potential damage.
Is you gear guy at the Planet Ford in Houston by chance? My parents live in Houston so that is an option if I need to have someone good look at it. The mustang performance shop I had in mind here just recently closed its doors due to hard times.
I'm going to change the fluid on Sunday and I'm going to use two bottles of RP 75w90 and a bottle a friciton modifier. Is that what you would suggest? I used the two bottles last time but no friction modifier. I'll check for shavings and take some hi-res pictures of the gears and maybe post them up if I'm unsure of potential damage.
Is you gear guy at the Planet Ford in Houston by chance? My parents live in Houston so that is an option if I need to have someone good look at it. The mustang performance shop I had in mind here just recently closed its doors due to hard times.
PM sent
03-20-2009, 04:41 PM
#17
4th Gear Member
Thread Starter
Join Date: Feb 2007
Location: Austin, TX
Posts: 1,139
ah I guess I didn't think that one through lol. Ok but the whining got worse over time and it instantly started vibrating at high speeds once I changed all the suspension components, which was 6 months after I had the gears installed. So I really don't think the vibrating is the fault of the gear install. The whining probably is though.
03-20-2009, 10:38 PM
#18
6th Gear Member
Join Date: May 2006
Location: earleville md
Posts: 10,357
what kind of control arms? we had a problem with upr's on whitefox's 98cobra, the uppers were too short, ****ed his pinion angle up, and he had very similar symptoms.... id compare the length of ur new control arms with your stockers
03-21-2009, 01:26 AM
#19
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Thread Starter
Join Date: Feb 2007
Location: Austin, TX
Posts: 1,139
they are stang suspension uppers and lowers. From glancing at it the angle does look positive (pinion flange is pointing slightly up to meet driveshaft) which wouldn't be very good I dont think. That said, mustangman says my pinion angle shouldnt be messed up enough to cause problems with the setup I have
03-21-2009, 09:39 AM
#20
Join Date: Feb 2009
Location: Texas
Posts: 8
Wow, you definetly on your way to finding the problem. If you want, pm me & I'll get you set up w/one of my performance shops in the area. Here is your best option bro, it may sound throwed but do it. Go find the smallest friend you got, mustang seats fold down for a reason. Offer his a beer to figure out where the sound is coming from. W/any luck you can put it on the lift & go straight to your problem. I may get some negative feedback on this one but that's how we do in the country on a budget lmao.