Has anyone broken their 12 bolt??/ I just bought one and I was wondering what it will take to break it??

Thanks

 

I have heard of them breaking but only really under harsh drag racing condion's i.e 1.5 60fts M6 car's tend to show it's weaknesses more freq. than a A4 car would..

 

I've broken spyder gears once then went to a spool. I have trashed 5 - 12 bolt Ring and Pinions in about 3 years. My car is a heavy M6 Street Twin car that hooks good with slicks. 60' times are nothing to write home about because of the weight. I bracket race the car every Sunday (usually about 6 to 10 passes). I also launch pretty hard at 4500 to 5000 RPM. I'm trying to go to a bit softer clutch for the 2004 season to ease up on the drivetrain a bit.

It's pretty hard to trash a 12 bolt with with footbreaking an auto. Would probably take gobs and gobs of power to do that. Now a transbrake might be a different story.

Steve

 

Anything is capable of breaking..............I saw a car blow a Ford 9" rear end and it was only running mid 12's IIRC. Obviously the 12-bolt is a much better rear end than the factory 7-5/8" 10-bolt, but under the right (wrong) circumstances, it can break too (just that the chances are much less than running with a 10-bolt).

 

I would think the posi unit (if that's what you got) would bust much quicker than the R&P. The axles from Moser are under warranty for like 7 years, but how many people shear an axle?

I already have a spool sitting in the basement for when I bust my posi. Not a question of it...more like when.

 

Werd. Some folks have far better luck than others, and some folks get away with great short times with their 10-bolt living a long life. Mine checked out quickly on a 4,000rpm ST clutch dump on ET Streets.

 

The posi is what will break first in the 12-bolt. If you have a Stick, it's more likely to happen. I just broke mine (posi), it's a heavy duty 800# Eaton posi. I did it after one pass on slicks, ran an 11.9. Not the fastest car, not the slowest, but it is a stick, and I run a street twin, it hits pretty hard. And, this was only a 1.7x 60 foot. After talking to Moser about what to do, they suggested that *possibly* using a TA cover would help, other than that, it is strongly suggested now that you go to a spool. However, for a street car that's not really an option (dangerous in the rain, and it's not really made to handle turning, so the wheel bearings wear out quickly if you go this route. I'm going to try the TA cover, along with my new 800# posi, this time with no additive in the hopes that it will take the beating a little better this time.

-Ernest Nichols
95 Z 11.9@118