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Old 11-26-2015, 05:21 PM   #1
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Default 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?
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Old 11-26-2015, 06:35 PM   #2
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Quote:
Originally Posted by Reverant View Post
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.
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Old 11-27-2015, 03:31 AM   #3
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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.
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Old 11-27-2015, 04:22 AM   #4
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6 speed should break before the axles.
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Old 11-27-2015, 04:23 AM   #5
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What is this Miata gearbox you are speaking of???
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Old 11-27-2015, 04:25 AM   #6
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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.
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Old 11-27-2015, 04:26 AM   #7
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RX-7 FD.

Looking to run an OS Giken diff instead of the Getrag/Ford.
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Old 11-27-2015, 04:28 AM   #8
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Do tell, how does the FD box bolt up?

What about the FC diff.
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Old 11-27-2015, 04:28 AM   #9
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Old 11-27-2015, 04:42 AM   #10
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Quote:
Originally Posted by aidandj View Post
Do tell, how does the FD box bolt up?

What about the FC diff.
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.
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Old 11-27-2015, 04:43 AM   #11
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I would like to keep the bill below $5K, lol.
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Old 11-29-2015, 08:20 PM   #12
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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 ***** 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.

Last edited by bbundy; 11-29-2015 at 08:30 PM.
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Old 11-29-2015, 08:32 PM   #13
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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.
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Old 11-29-2015, 08:37 PM   #14
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Hush now.
Let the grown ups (Dimitris and Bob) talk, baby boy.
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Old 11-29-2015, 08:43 PM   #15
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Bob was the one that I first saw talk about axles being the fuse in his driveline...
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Old 11-29-2015, 08:59 PM   #16
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Stock axles in a 400whp car is like putting 10A fuses in a 30A system
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Old 11-29-2015, 09:30 PM   #17
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That's standard operating procedure in my book

Are MSM axles only available used? Has anyone ever compared them to s2k axles?
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Old 11-30-2015, 01:27 AM   #18
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Quote:
Originally Posted by Savington View Post
Stock axles in a 400whp car is like putting 10A fuses in a 30A system
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.
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Old 11-30-2015, 01:34 AM   #19
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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
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Old 11-30-2015, 04:40 AM   #20
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Quote:
Originally Posted by Savington View Post
Stock axles in a 400whp car is like putting 10A fuses in a 30A system
Well, I'm looking at 500rwhp and 450rwtq, so I better find something a little more reliable.
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