FML, Broken again :(
 

Last session of the day and my rear end started making a high pitch whine under load. Took the car home and checked underneath, all looks normal. Decided to just give up and bring it to Z1 on tuesday, when I reversed for the first time all day and there is a bad knocking noise when starting in reverse, coming from the left axle.

However, taped up the wife's Z4 and will give that a shot tomorrow. Just got new tires for it friday too!
http://sphotos.xx.fbcdn.net/hphotos-...16141400_n.jpg

Was going to take the new Stang, but the 235 tires on it are just too skinny! breakin isn't an issue cause its a 2 year lease.

Yikes! Sounds bad. U-joints?

Damn mike i hate to hear that. Hope you get it all worked out my good man. :tiphat:

Ouch..............what was the diagnosis?

I won't know for a bit. Taking it to Z1 tuesday.

Sub'd

Sounds like the rear end to me.

You may have to drop it and see whats broke or the reverse in the trans? Either way it doesn't sound good :(

:(

yeah, its not the trans. its definitely in the left rear half shaft, I just can't pinpoint which end.

The Z4 was fun today, while the factory brake fluid held out. Pedal started getting soft so I just did one session, but it was good.

Hope its not too bad!

Bummer! :(

Kind of on-topic, what kind of tape are you using on the Z4 to protect from chips?

that is masking tape used for powdercoating. It is awesome for the track though, leaves zero residue but is thick enough to stop any thing that could get thrown at you.

I buy it in bulk from the manufacturer, because I use a lot, but you can get it here:

Green High Temp Tape

Thanks for the link! I guess you prefer this over traditional painter's tape? How does it hold up on waxed/sealed surfaces? I couldn't get painter's tape to stick to my car this year... way too much Zaino on the car. Guess that's not a bad thing :tup:

This might be an option for the trip down to FVR next year!

it goes over a waxed surface fine and sticks real well. Its much better than painters tape.

What kind of LSD? Did you have cooler on rear diff? They get real hot.

He has an upgraded LSD, i don't remember which one and yes he does have a rear diff cooler.

he's got the Quaife diff with GTM diff cooler

what he said. The diff cooler was definitely doing its job too.

Hmm will be intersted knowing what went pop!

they said the grinding in reverse noise was a stuck/hanging up brake pad and the whine is worn gear in the differential. Not sure how it got worn so fast though.

Now the question is, do I change gear ratios? Not sure what to do yet.

4:10 gear gets my vote :tup: (or is it 4.08?)

I think it 4.08's

So was this worn after the LSD install? Seems it would have to be being this would of obviously been seen when installing. Did the LSD have to be shimmed? Was the backlash checked?

I don't know at this point. All I had was a phone message. Think I will stick with stock gearing, don't want to lose the SRM

i got a quaife installed on my open diff 6 speed.
i noticed it was making the whining sound. so i told the shop that installed it and he said it was normal. so i've driven the car a few hundred miles. also installed new bearings.
i will talk with him and make him fix this, but could the quaife be damaged? will i need new bearings and gears?

if your diff is making a whine noises, its because the ring and pinion contact is not correct and the back lash needs to be re checked

Sounds like it wasn't shimmed correctly. Thats why I'm having my shop put it together and not in the car. I've also requested when it is done, that they show me the diff gear painted so I can personally see the contact pattern. Its hit or miss with shops out here in Hawaii.....and we are very limited on choices.

http://www.allfordmustangs.com/forum...r-patterns.gif

ok. i will need to take off and have them check it.
do you think gears or bearing might have to be replaced?

i had a shop do this install, because i didn't want to screw it up.
but i doubt they checked the backlash like you explain.

Backlash is just as important as shimming. If backlash isn't set then basically the gears are slapping each other or forcing themselves to bite instead of a smooth engagement. Over time the gears will get damaged. Remember that all these settings are set within 1/1000's of an inch for a reason.

I think they had to replace my gears, but I'm not 100% positive on that.

I'm sure you're well invested in your tuning, but EcuTek appears to have software that can correct the SRM when you change the final drive :tiphat: