Diff blew on the dyno. I've never seen this happen, neither has anyone at LAPD. Funny thing is there was no load. Happened under 4400rpm on eddy current during the tune. New diff going in now as we speak.

http://i244.photobucket.com/albums/g...Attachment.jpg

 

Wow...Thats different...

 

I haven't been on here in awhile. Are you trying to be funny?

 

Nope, just never seen one break that way before...

 

could it be just a defective differential?
or is this an example of fatigue after wear and tear?
the only diff I blew up was under a single high stress event
and it seems thats how most corvettes go boom too.

 

Diff had 67k or so on it. It did have a hardened driverside shaft installed at the time, that and a DTE.

 

YUP! I seen it when I was there the other day!

That is a hard one to believe that happened! I actually thought that perhaps the owner had the gear set changed to a 3.73 or something and perhaps it let loose! But if it is stock then it is a wonder

Thanks,Matt

 

was probably full of stress cracks and keep in mind that strapping it down tight and putting a full boogie load on it doesn't allow for spin that would project it. it probably cracked on the pull (or before) and then let go !!

I had a buick fold the crank coasting to a stop with no load. it happens!

 

Its a stock 3.42 diff. The only thing that was done like I said was a drivers side shaft. This car is tearing me to pieces....only to sell it.

 

Is the piece that broke off in once peice? Maybe you can see if something was rubbing or pushing against it.

 

The car is at LAPD now and I'm sure they will investigate it properly after they get the new diff in.

 

According to DTE, in the event the strut brace has been incorrectly adjusted, it can/will cause rear end damage.

I'm not sure this was the case, but its something to look into.

BTW, who's gonna tune your car now that Doug walked out?

 

We've never seen a failure like this while a car is on the rollers, but I suspect there were already issues present somewhere in that differential beforehand, where the ultimate failure occured during those loaded conditions.

Re: the differential strut~
Make sure the strut rods of the differential strut kit are installed properly in that they *pull themselves together* when tightened/adjusted, so the differential is being "pulled" towards the transmission.

If they are installed and adjusted improperly to where some or all of the strut rods are "pushing" themselves apart, you will have effectively pre-loaded the differential in the wrong direction, causing the differential case to distort- which eventually leads to catastrophic differential failure. Proper installtion/adjustment of the strut rods are paramount to the correct function of the differential strut kit.

*This we have seen happen from negligent installers that didn't follow the directions we provide them in the kits. I don't know if this is what happened in your situation, but it is something worth investigating to be sure the differential strut is installed/adjusted correctly, or you will have the failure again..

We cover all of these installation guidelines clearly in the kit's instructions, but if you require a bit more assistance to install, just give us a call. 260.407.5455


Regards,
Phil