I just had my rear gears installed today. The axle shop I chose has the best reputation in town for doing this type of stuff. To put it bluntly my Mustang sounds like a school bus when I let off the gs above 40mph[:@]. The shop says everything was installed correctly from the spacing to the shims and all that. They even spoke with the manufacturer to make sure everything was good.

Is there such a thing as a break in period for gears? Maybe the gears are faulty?

Anyone have similar situations or advice for me? Gears are really something I know very little about.

 

unless you put richmonds or other straight cut gears in, the install is wrong

3 heat cycles are all you need

 

i've READ **** loads about this on this forum and others. here's what people say:

1) gears should never whine so they were installed wrong
2) the whine is the limited slip doing it's job, get used to it or add friction modifier to shut em up

i don't know the answer I'm sorry, but i have not had gears put in yet for this EXACT reason: that they'll start whining and freak me out that something's wrong.

if you do a search [this feature sucks on this forum] on this forum or stangnet.com or allfordmustangs.com there is a ton of info out there, but i predict you'll probably break it down to the 2 "answers" i provided above.

 

What brand did you go with? And ratio?

 

my original gears would go "woop, woop, woop" when I let off the gas. Got real loud at about 30-40mph.
Had the dealer replace the gears (had to stick to stock ones) and now there's a faint whine when I am ON the gas! I have a feeling that's as good as it'll get!
I've been hearing that only one brand of rear gears will work on our Mustangs and that the angle must be right on.

 

Man,I hate to tell you this, but you got a bad install. Whoever told you it was the limited slip is an idiot. I agree with mustangman02232- 3 heat cycles should be all you need. Were these gears made by Motive? I'd be all over that shop like a cheap suit- gears properly installed do not whine. The only gears I'd even consider would be FRPP. Like the other guy said, this is the only reason my baby isn't sportin' 4.10's, I've had one bad experience with a gear change (2 actually) so my 3.55's will do just fine.

 

You should insist they do the job over. You got a bad install (regardless of the excuses).

 

Bad install - no doubt. Believe me - I've gone through months of gear repairs with Ford. Their first attempt made my car sound just like yours.Service mgr admitted his guy probably just slapped them in without checking backlash, pattern, etc. Go back and tell them to do it till it's quiet.

 

Sucks that it has happened again. Nothing new on this forum and others. I have been holding off as I am worried that the same thing will happen.

 

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.