D'oh!

Last time I went to the track was last December with a few guys from the forum where I set my new best time (video in sig). The last run of the day the rear decided to make some noise but I've only gotten around to checking it out NOW unfortunately (my work schedule has been absolutely horrid plus not having a place to work on the car sucks too). Upon pulling the axles this is what I found.



Those are Moser 31 spline axles, Ford 9", with a full spool. Tires are MT DR 295/15s.

I have not yet pulled the center section to inspect for any more damage but I strongly believe that my measly 455whp should not have been enough to twist the axle splines like that. However, Moser recommends that you have at least 1" of engagement on the axle splines which I have. I am wondering if I should lengthen the axle another 1/2" or so for more engagement being that I do drive the car on the street (which may have contributed to slowly weakening the axle). The other axle was undamaged.

What are your thoughts?

 

Don't buy moser that would be a start and ya get some more depth

 

Before looking into more engagement be sure to check that you have room to do so.

Only one was twisted ??? Be sure to check the entire length of the other one

I will also guess it was the right side ?

 

The twisted axle pictured actually came out of the driver side. I'll reinspect the other axle today but at first glance it looked fine.

 

Hopefully that's all the damage there is. Aside from more engagement I think the glaring issue is the race weight. Not so much the power, just trying to move that mass on a decent hit gonna beat on them.

Not my car, not my $$$ but I would look at both.

 

No way that should have happened with a A4 trans and that kind of power.

The driver side axle is almost always the first one damage will happen to. The rearend counter rotates engine torque and plants it harder than the right side, increasing the load on that side.

Chances are there is no other damage, and the axle would have done the same thing even with more engagement.

I'd say it's time to step up... give me a call and I will see what I can do for you.

 

I would show Moser your axle, video and timeslip and ask them if they think the axle should have held up at that duty level.

 

My buddy made the same power with a lt1 car and a t56 and his did the same thing 2x in 3 years. He said **** it and put in 35 spline axles with posi.

 

Time for more splines! Go with some 35's and be done with it...

 

When I was pricing everything....the 35's were same as 31's.....made the choice simple.

 

At that rate it's not holding up much better than a 10bolt.