Whining Gears
04-20-2007, 12:20 AM
#11
2nd Gear Member
Thread Starter
Join Date: Oct 2006
Location:
Posts: 340
RE: Whining Gears
What I bought were Motive Gear Performance gears. They are 3.73's.
I have a contact at a Ford dealer who is a service manager. He says if the gears were installed wrong (which he believes the case to be) even if it is corrected the whining noise will always remain. If this is true then I'm out the gears, too.
I have a contact at a Ford dealer who is a service manager. He says if the gears were installed wrong (which he believes the case to be) even if it is corrected the whining noise will always remain. If this is true then I'm out the gears, too.
04-20-2007, 12:31 AM
#15
RE: Whining Gears
ORIGINAL: fairlane292
Would love to go 4.10's but I like my quiet 3.55's. If I could get a guarantee "no whine" I'd consider it. So many complaints on this I just can't go there.
Would love to go 4.10's but I like my quiet 3.55's. If I could get a guarantee "no whine" I'd consider it. So many complaints on this I just can't go there.
this is why you get referance from local stang clubs or reputable tranny shops to do this and not a joe shmoe place or a ford dealer for that matter
04-20-2007, 12:31 AM
#16
1st Gear Member
Join Date: Apr 2005
Location:
Posts: 102
RE: Whining Gears
I have an 05 V6 and changed my gears to 3.73's along with an Auburn Pro LSD and had the same exact sound at the same exact speed. 40 mph and it does sound just like a bus. I then had the gears changed again and again and again. I tried three different installers at two different shops, the two best in the area, four separate sets of gears and to no avail. I tried 3.73's, 4.10's, 3.73's again and finally 3.27's. The 3.27's are in now and are not quite as loud but still much too noisy for my taste. It's obviously something to do with the carrier as the speed that the horrendously loud noise kicks in at was always the same, 40-50 mph, considering the carrier is always turning at the same speed regardless of gear ratio it makes since. From all my research I have come to the conclusion it's the carrier bearing pre-load is wrong. I even mentioned that to the shops and they swear it was set up right. Considering before the gear change it made no noise at all and then afterwards no matter what gears I used it made the same awful noise it has to be the carrier. Also after putting about four thousand miles on one of the gear sets when they were changed again the carrier bearings were scored lending more credence to my theory. It seems to be a crap shoot as to whether any particular rear end is going to make noise after a gear change. I've read about numerous people with both 8.8 and 7.5 rears that had no problems after an install and yet others like me that could not get it right no matter what. I think it's something wrong with the housing itself that makes setting up the gears to not whine so difficult. So my solution is going to be either to get a factory fresh 8.8 with gears already installed or get a brand new Ford Racing rear end and install the best gears & differential available, cross my fingers and hope it doesn't make noise.
If anyone that has this problem can get an installer to try messing with the carrier bearing pre-load to see if that really is the issue it would be something good to know. None of the installers I tried was willing to take the time to mess with that.
If anyone that has this problem can get an installer to try messing with the carrier bearing pre-load to see if that really is the issue it would be something good to know. None of the installers I tried was willing to take the time to mess with that.
04-20-2007, 12:35 AM
#17
2nd Gear Member
Thread Starter
Join Date: Oct 2006
Location:
Posts: 340
RE: Whining Gears
ORIGINAL: mustangman02232
no helical cut gears will whine, period, end of statement no ifs ands or buts, if they do, take them back and get them redone, or ask for your money back and have another shop do it right
this is why you get referance from local stang clubs or reputable tranny shops to do this and not a joe shmoe place or a ford dealer for that matter
ORIGINAL: fairlane292
Would love to go 4.10's but I like my quiet 3.55's. If I could get a guarantee "no whine" I'd consider it. So many complaints on this I just can't go there.
Would love to go 4.10's but I like my quiet 3.55's. If I could get a guarantee "no whine" I'd consider it. So many complaints on this I just can't go there.
this is why you get referance from local stang clubs or reputable tranny shops to do this and not a joe shmoe place or a ford dealer for that matter
04-20-2007, 12:46 AM
#18
2nd Gear Member
Thread Starter
Join Date: Oct 2006
Location:
Posts: 340
RE: Whining Gears
ORIGINAL: vb101
I have an 05 V6 and changed my gears to 3.73's along with an Auburn Pro LSD and had the same exact sound at the same exact speed. 40 mph and it does sound just like a bus. I then had the gears changed again and again and again. I tried three different installers at two different shops, the two best in the area, four separate sets of gears and to no avail. I tried 3.73's, 4.10's, 3.73's again and finally 3.27's. The 3.27's are in now and are not quite as loud but still much too noisy for my taste. It's obviously something to do with the carrier as the speed that the horrendously loud noise kicks in at was always the same, 40-50 mph, considering the carrier is always turning at the same speed regardless of gear ratio it makes since. From all my research I have come to the conclusion it's the carrier bearing pre-load is wrong. I even mentioned that to the shops and they swear it was set up right. Considering before the gear change it made no noise at all and then afterwards no matter what gears I used it made the same awful noise it has to be the carrier. Also after putting about four thousand miles on one of the gear sets when they were changed again the carrier bearings were scored lending more credence to my theory. It seems to be a crap shoot as to whether any particular rear end is going to make noise after a gear change. I've read about numerous people with both 8.8 and 7.5 rears that had no problems after an install and yet others like me that could not get it right no matter what. I think it's something wrong with the housing itself that makes setting up the gears to not whine so difficult. So my solution is going to be either to get a factory fresh 8.8 with gears already installed or get a brand new Ford Racing rear end and install the best gears & differential available, cross my fingers and hope it doesn't make noise.
If anyone that has this problem can get an installer to try messing with the carrier bearing pre-load to see if that really is the issue it would be something good to know. None of the installers I tried was willing to take the time to mess with that.
I have an 05 V6 and changed my gears to 3.73's along with an Auburn Pro LSD and had the same exact sound at the same exact speed. 40 mph and it does sound just like a bus. I then had the gears changed again and again and again. I tried three different installers at two different shops, the two best in the area, four separate sets of gears and to no avail. I tried 3.73's, 4.10's, 3.73's again and finally 3.27's. The 3.27's are in now and are not quite as loud but still much too noisy for my taste. It's obviously something to do with the carrier as the speed that the horrendously loud noise kicks in at was always the same, 40-50 mph, considering the carrier is always turning at the same speed regardless of gear ratio it makes since. From all my research I have come to the conclusion it's the carrier bearing pre-load is wrong. I even mentioned that to the shops and they swear it was set up right. Considering before the gear change it made no noise at all and then afterwards no matter what gears I used it made the same awful noise it has to be the carrier. Also after putting about four thousand miles on one of the gear sets when they were changed again the carrier bearings were scored lending more credence to my theory. It seems to be a crap shoot as to whether any particular rear end is going to make noise after a gear change. I've read about numerous people with both 8.8 and 7.5 rears that had no problems after an install and yet others like me that could not get it right no matter what. I think it's something wrong with the housing itself that makes setting up the gears to not whine so difficult. So my solution is going to be either to get a factory fresh 8.8 with gears already installed or get a brand new Ford Racing rear end and install the best gears & differential available, cross my fingers and hope it doesn't make noise.
If anyone that has this problem can get an installer to try messing with the carrier bearing pre-load to see if that really is the issue it would be something good to know. None of the installers I tried was willing to take the time to mess with that.
04-20-2007, 01:04 AM
#19
3rd Gear Member
Join Date: Feb 2006
Location: Fenton, MO.
Posts: 645
RE: Whining Gears
ORIGINAL: FlyShuffle
I have to agree with all the posters who say it is a bad install. I am not a mechanic myself, but I helped by buddy put in my FRPP 4.10 gears so I watched what went into the install. He is a certified mechanic andteaches auto repair for a living, so it was like I gota free lessonin addition to a really inexpensive gear install. Bonus!
This is what I observed, and again, I am not the expert, so take it with a grain of salt. What I saw, there is a lot to it to get the gears to line up correctly- shims to line the ring up left to right and set the correct pinion depth. He spent a lot of time applying this gear marking compound to the ring and turning the gears to see what kind of pattern or markthe pinion made in the compound where it made contact with the ring. Then he showedme what he teaches his students. He had a document that showedwhat themark would look like if it was lined upcorrectly, what it would look like if the pinion was too deep, too shallow, etc. When I mentioned to him all the postings about gear whine I have read in theseforums while I was learning aboutwhat gears toput in myself, he stated with outblinking "bad install, here is why. They didn't take the time to be diligent and lineup the gears correctly."Seemed pretty plausable to me afterwatching my own gear installation.
I have to agree with all the posters who say it is a bad install. I am not a mechanic myself, but I helped by buddy put in my FRPP 4.10 gears so I watched what went into the install. He is a certified mechanic andteaches auto repair for a living, so it was like I gota free lessonin addition to a really inexpensive gear install. Bonus!
This is what I observed, and again, I am not the expert, so take it with a grain of salt. What I saw, there is a lot to it to get the gears to line up correctly- shims to line the ring up left to right and set the correct pinion depth. He spent a lot of time applying this gear marking compound to the ring and turning the gears to see what kind of pattern or markthe pinion made in the compound where it made contact with the ring. Then he showedme what he teaches his students. He had a document that showedwhat themark would look like if it was lined upcorrectly, what it would look like if the pinion was too deep, too shallow, etc. When I mentioned to him all the postings about gear whine I have read in theseforums while I was learning aboutwhat gears toput in myself, he stated with outblinking "bad install, here is why. They didn't take the time to be diligent and lineup the gears correctly."Seemed pretty plausable to me afterwatching my own gear installation.
Then the break in.................3 heat up sessions on the highway. Had FRPP 3.73's installed. No whine at all. I did use a speed shop that does this kind of work all the time. These guys are serious when it comes to drive trains.
I'm the same way when it comes time to give the car a wash and wax job though.
I agree with everyone else............bad install and possibly bad gears.
04-20-2007, 08:10 AM
#20
2nd Gear Member
Join Date: Mar 2006
Location:
Posts: 441
RE: Whining Gears
Just had a shop here that has installed many Motives on many Mustangs, and they could not make my set work without completely eliminating the whine. We gave up and went with FRPP's and I'm at 250 miles now and no whine. No burnouts yet, but have gone WOT from a roll.