Good Morning Everyone..

I wanted to see your opinion on a situation Im having.. Some months ago I pulled the axles( Moser 31 spline) on my MWC 9inch (stock lenght). Turns out one of the axles splines had twisted. At this point the car hadnt been race for 1 year.

So I talked to the guys at MWC and expressed my concern about the splines of the axles sitting partially only inside the spool. You can clearly see the wear mark on the good axle and the twist point on the other one.. [I will attach pictures]

Well I ended up upgrading to Pro Race 31 spline with the same lenght of the previous ones. I didnt upgrade because I didnt wanna pull out the center section. Yesterday I went to the track for the 2nd time..and 1 axle broke on the 1st 6k rpm launch... Car is on motor still and trapping 126mph. That was the 3rd launch on those axles. First one was a 4900 rpm launch, 2nd one was a 3rd gear launch and 3rd this 6k launch..

My question is how much in lenght should each axle actually be hugged inside the spool..

I will talk to MWC on monday and try to pull the axles to see the carnage... Driver side was the one that broke...

 

 

Time to get 35 splines and be done with it.

 

I don't remember mine sitting in the spool very much either. To me a 31 spline moser is very weak. Strange 35 spline street axles is what I have.

 

Yes that will be my next step, however I wanted to get an imput from you guys on how far the axles are sitting inside the spool. The one that broke was the Driver side which is the same as the one pictured above that previously twisted.

 

The other seems to be sitting good inside the spool as per the wear pattern. Im just afraid the one that keeps twisting/breaking is a bit short and is putting to much stress on the tip of the axle. Thanks

 

Thanks thats what I was looking for.. I was just getting paranoid thinking that maybe this axle was a bit too short.

 

I can't remember exactly how far mine was in the spool but it looks close to the same from what I remember looking at. You might have been able to get more in there if the axle was longer. All I can say is measure the housing then both axle lengths from where housing seal would have met the outside edge of the housing. I've heard some bad things about mosers axles and products in general.

 

Well Those in the pictures are Moser 31 spline. The one I just broke yesterday is Strange Pro Race 31 spline. Ill post pictures of that one tomorrow when I pull it.

 

Dang, so much for strange lol

 

^^^^^^this. My 35 spline axles have been in my car since 2005. I have made hundreds of passes on them. When i took my axles out last year.......splines still look like new

 

Thanks man, thats what Ill be doing .. for now the car will seat untouched for 2 or 3 weeks till I can purchase everything for the upgrade.

 

Curious how much power, how heavy & what size wheel studs you're running?
I think I need to check my 31 spline Mosers.

 

When I was rebuilding my 12bolt I wanted bomb proof.
My few fast buddies said 35 spline and be done...same $$$ for 31's as 35's, so it was a moot point

 

I've been on 31 spline axles and a posi unit for probably 4 years. Several passes from almost 7k on a stock bottom end and now I'm at 571/522 and haven't had any problem. I'm running strange axles. I may need to pull them and check after this.

 

when I was a 6-speed car 60fting in the 1.4x range, 600rwhp. i twisted the **** out of some 33 spline moser axles. I now have 35 spline and never had an issue again.

 

Im running 1/2 inch strange wheel bolts all around. I havent weighted the car but it should be around 3300 race weight and has mid 400s rwhp in a mustang dyno. Traps are 126 mph.

 

I think we can all blame the t56.. This thing has been breaking stuff left and right.

 

The Pro Race axles are stronger for sure, but it is quite obvious you are well beyond the capability of a 31 spline diameter, no matter the material. When you purchased the rearend and wanted a posi unit for a street driven car the only descent option was a 31 spline clutch type posi or a Truetrac. Since then there have been a handful of 35 spline posi units come onto the market and have proven to be a very worthy step in the right direction.

It is no secret, the T56 cars will eat rearend and driveshaft components with ease compared to any auto, and if you have enough power with the weight of these cars it is still tough on even some aftermarket parts.

My best advice at this point is to sell off the complete center section as the cost to change over to 35 will render the case and posi useless, the two biggest cost items in a 9" center. You should be able to get a good chunk of change out of that unit and recoup it toward the new setup, your end out of pocket expense won't be too bad.

Give us a call, we will sure take care of you!

 

Thanks for the response, Yes my initial purchase years ago was with a TrueTrac and 31 spline moser axles. The TruTrac broke too on the 1st pass and I had enough and just went to a spool with the moser axles witch are the ones shown in the pictures here. Question though . I do want to Nuclear Bomb Proof this thing cuz the car is getting nitrous now but you mentioned that I should sell the aluminium center section and upgrade? Cant I just upgrade with this same center section to a 35 spline spool, axles package?

Thanks