Gear noise in the rear end of my 512 TR!

Yes, there is a good chance that something is out of line.
If you can hear it from the Driver's seat while driving it is bad news.
If it is affecting the operation of the transmission it's REALLY bad.

YOU DO NOT WANT TO DRIVE IT UNTIL IT BREAKS.
Doing so can add an additional 10k to the repair bill.

 

Welcome to the Club

Go here for more answers:
Crown and Pinion issues, http://www.thebestemployee.com/forum/showthread.php?t=364477&highlight=differential

Carrier issues.
http://www.ferrarichat.com/forum/showthread.php?t=366206

http://www.ferrarichat.com/forum/showthread.php?t=343161

http://www.ferrarichat.com/forum/showthread.php?t=349142

Another TR/Boxer Diff, Crown & Pinion solutution, Fchat link. http://www.thebestemployee.com/forum/showthread.php?t=226140&highlight=differential

 

What year is your car and how many miles

 

Sorry Han ... not 10K but more likely 30K .... and I know ....

 

The 10k was a best-case scenario (in addition to what it would cost pre-emptively).
The 30k figure just reinforces the reason why mine remains parked until it's major service.

 

Chances are they put a sh*tty gear fluid in or put in too much slip additive.. I would flush it and fill it with Royal Purple, drive it a bit maybe 30 miles, flush it again and refill.. get whatever they put in out of there.. Dont panic..

R

 

Mr Chairman could be on to something, I agree. Start at the fluids, fingers crossed and go from there.

 

I would do not so: have a F shop using a "listening device" at the gb before moving at all ...

My shop uses such a stescope with a iron pin at the end to hear noises: they will hear any squeeks if things are wrong back there !

Please: do NOT drive it anymore ....
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Another good starting point Melvoc. I hope it's nothing major....

 

I honestly don't think changing oil is going to make that noise go away, unless it's 1000 weight grease, maybe...
Once a diff starts making a pronounced GEAR whine the damage is done.

The whine in the OP's car COULD be made by something else. Let's hope so.

 

JUST hjad an engine out 30K? you say....hmmmm

since you seem to have indicated its a rotating mass issueNOT related to engine RPM, but to vehicle speed-axle rpms-then you may also rule out bearings in the 1st motion shaft, and PROBABLY lay shaft. In this case this is the pinion....if nthere are no THUNKS as you release the clutch, then the layshaft endfloat and pre-load is likely NOT the culprit....
Since you state it is speed related and increases with speed-under load-it would suggest thyat carrier bearings are either shot, or, you've spun a race in a side cover and that explains the new slop in the tapered rolled-whichever side it may be-in either event, these allow pieces are each in the 5000+ each region and does NOT include the cost of a NOS 512M LSD carrier, replace the connector shaft as well-if you can still get an M version(always link to Mpartrs when available, they are more but it will be the end of the story.
good luck-let us know...

obviously its bearings-somewhere, I'm familiar and have done many of these, and am fairly certain that it has not gotten tooo expensive yet...like I said, several hundred dollars in carrier sets, but condition of race housing will be the big question....
ciao!

 

Drain the GB to find particles of steel .... good luck ....

 

How long ago was he engine out done.. Did you just pick it up? Did you get it back a few months ago and now have this noise? Was this the first drive since the engine out? What fluid did he put in the gear box? Is there fluid in the gear box? Did you check fluid level in gear box? What kind of noise is it.. Whining? Chatter? Do you feel it in the shifter? Is she difficult to shift? Etc.. Give us some more info... I would stop driving her or safety sake... then breathe... and calmly check to see what is going on.. How do you drive her? Have you side stepped the clutch at all? Roasted the tires? Has you mechanic roasted the tires when he had it? I would also drain the gear box and see if any metal particals are in there.. It may be something or it may be nothing but a fluid issue.. If its somethings its going to be big.. The TR never has mercy on us.. She has a b*tchy attitude and sometimes like any other high class b*tch she wants you to go shopping for her because she wants something new.. and expensive.. Typical b*tch.. lol..

R

 

So, this post should be bulleted and made a Sticky so it can be referred to every time a new post is started about Diff noise in a TR, or any other car for that matter.

 

* How long ago was the engine out done..
* Did you just pick it up?
* Did you get it back a few months ago and now have this noise?
* Was this the first drive since the engine out?
* What fluid did he put in the gear box?
* Is there fluid in the gear box?
* Did you check fluid level in gear box?
* What kind of noise is it.. Whining? Chatter?
* Do you feel it in the shifter?
* Is she difficult to shift?
* Stop driving her or safety sake...
* How do you drive her?
* Have you side stepped the clutch at all?
* Roasted the tires?
* Has your mechanic roasted the tires when he had it?
* Drain the gear box and see if any metal particles are in there..

 

Are you being sarcastic. Lol. I know I'm all over the place sometimes.

R

 

Lets hope it's an easy inexpensive fix

Best
Tr boy

 

No, I'm not being sarcastic (at least not this time.)
The questions you pose demonstrate the correct thought process to systematically eliminate possible causes.

Not everybody has the ability or knowledge to do this.

I could probably add a few more just to round out the list.

 

You are on the right track.
I don't want to be a downer but the first indications of an issue with the differential carrier appear at the driver's side carrier bearing, around where the axle bolts up.

Total failure manifests itself as cracks & breakage of the transaxle case around the axle flange area as the left hand bearing disintegrates from expansion of the carrier itself.

If this hasn't happened yet you may have "just" a bearing failure so far, possibly the beginning of a carrier split.

Best of luck.

Don't forget to check those links up above if you haven't already.

 

When my diff housing failed a number of years ago, it started whinning first. I did the drain the oil... check for metal... steps etc, and all was seemingly OK. I had a FOH look at it and they said likely the diff housing had failed. THEN sure enough, it suddenly had a gearbox oil leak as the housing at the CV joints on the drivers side finally cracked and broke. All 512 welded diff housings will eventually fail...

 

Anytime you always have cart blanc with anything I write brother.

Be well

R