Standard vs MSM axles
 

Does anyone have any hard data on the actual differences between a 95.5-05 and an MSM axle? I've read in many different posts about the MSM axle being beefier on the inner splines, but what about the rest of the shaft, including the joints?

The joints are different, beefier design on the MSM axles. I know the outer joint is bigger and a different design, and the axle shaft diameter is larger as well.

Does anyone have any comparison pics or data? Looks like this is the only option for people looking for serious power, before the Ford 8.8 or Getrag driveshaft shop kit.

6 speed should break before the axles.

What is this Miata gearbox you are speaking of???

Lol. What gearbox are you running? Whats wrong with a getrag or 8.8 if you've gone that far. Price difference isn't horrible.

RX-7 FD.

Looking to run an OS Giken diff instead of the Getrag/Ford.

Do tell, how does the FD box bolt up?

What about the FC diff.

8.8 OSGiken

OS Giken releases the new 8.8 Ford IRS Limited Slip Differential- Get it here.

They don't "bolt up".

They need an adapter plate or converted bellhousing (I'm using the latter).

You need a modified PPF adapter to get it to line up to the diff correctly, and a shorter driveshaft.

As for the FC diff, I'm looking to keep costs at a minimum, this means that if the MSM axles can handle 500whp, and I get to keep everything else on the car as-is, that's good enough for me.

I would like to keep the bill below $5K, lol.

The mazdaspeed uses a trypoid type inner CV that is much more durable. also has bigger splines going into the Diff and the shafts themselves are bigger diameter. I suspect the mazdaspeed ones would be pretty bullet proof.

At over 300 ft-lbs to the rear wheels and frequently using sticky Hoosier rubber I've managed to twist one standard rear axle in two where it plugs into the outer CV and I consider the Inner CV's a wear Item. After about a year of use the balls on the inner CV start to create deep divots in the housing I replace them when there starts to be just a huge amount of rotational slop. For the most part I would say the Inner CV's won't handle the load but but the failure mode is usually more like accelerated wear than catastrophic.

I just picked up a pair of axles brand new for $55 each from advance auto. I'll be happy if that's the weakest link in my driveline.

Hush now.
Let the grown ups (Dimitris and Bob) talk, baby boy.

Bob was the one that I first saw talk about axles being the fuse in his driveline... :)

Stock axles in a 400whp car is like putting 10A fuses in a 30A system

That's standard operating procedure in my book :bigtu:

Are MSM axles only available used? Has anyone ever compared them to s2k axles?

They actually work fine if replaced yearly. The only axle I twisted in two already had past the normal replacement window. I keep my eyes pealed for cheap used replacements all the time usually an Ebay Auction. I frequently find the only available source is salvage yards or Ebay. Nobody has new or rebuilds in stock. Mazdaspeed ones are hard to come by and require a different diff and I'm guessing there several pounds heavier.

Bob I just bought 2 axles for $55 each from advanced auto. they shipped a few days ago and should be here on the 3rd.

Brand new not reman. Code trt30. Go order 20 :bigtu:

Well, I'm looking at 500rwhp and 450rwtq, so I better find something a little more reliable.