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post #1 of 17 (permalink) Old 04-15-2011, 11:43 AM Thread Starter
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Strongest Halfshafts

I know I read a string of posts on this subject in the recent past, but now I can't find it. Just to confirm - the strongest halfshafts are the Mark VIII parts, correct? With the manual trans SC parts a close second?

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post #2 of 17 (permalink) Old 04-15-2011, 11:51 AM
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Strongest is to build from cobra axles. MarkVIII are hardened where the others like to break, sc are larger where they do not often break.
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post #3 of 17 (permalink) Old 04-15-2011, 11:55 AM Thread Starter
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Alan,

What is involved in making Cobra axles work on an MN12?

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post #4 of 17 (permalink) Old 04-15-2011, 12:15 PM
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I was told just a little machining however I have never done it myself. You also need a 31 spline diff.
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post #5 of 17 (permalink) Old 04-15-2011, 12:18 PM
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hear it had to do something with the inner part of the CV joint....there is a write up on sccoa by eecdoc that did it.

here is a link...

http://www.sccoa.com/forums/showpost...4&postcount=18

another...

http://www.sccoa.com/forums/showpost...0&postcount=24

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post #6 of 17 (permalink) Old 04-15-2011, 12:48 PM
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It is only I think 96+ MarkVIII axles, or possibly 97/98 only, that were hardened and therefore stronger. SC axles would be second best, with all years being the same. Axles out of a 5-speed car will have one a larger diamter than the other, but that is only to reduce wheel hop and does not make it any stronger.

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post #7 of 17 (permalink) Old 04-15-2011, 04:53 PM Thread Starter
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I tried to contact Raxles today and got a message that they are currently shut down. Seems to be a pretty small operation.

Over at The Driveshaft Shop they have 28 spline halfshafts which are rated for 600 rwhp. They aren't cheap ($1600 for the pair) but would be all I will ever need. Anybody on here have any experience with this product, good or bad?

MikeB
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Last edited by MikeB; 04-15-2011 at 04:59 PM.
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post #8 of 17 (permalink) Old 04-15-2011, 05:28 PM
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Quote:
Originally Posted by MikeB View Post
I tried to contact Raxles today and got a message that they are currently shut down. Seems to be a pretty small operation.

Over at The Driveshaft Shop they have 28 spline halfshafts which are rated for 600 rwhp. They aren't cheap ($1600 for the pair) but would be all I will ever need. Anybody on here have any experience with this product, good or bad?
Raxles is shut down?!? I didn't know that - I've bought axles from them more than once - they are not that far from me. I'll try to go by there, see what's going on, and let y'all know. BTW, they were actually pretty good sized last time I visited (about 4-5 years ago).

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post #9 of 17 (permalink) Old 04-16-2011, 03:16 PM
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Have you tried SC or MarkVIII axles yet? People are putting down some pretty impressive times with stock axles, so unless you are repeatedly breaking them, I would find it hard to justify $1600. I know both of Dave Neibert's cars, as well as that Vortech supercharged black MarkVIII are all running 10s on stock axles, so unless you are having problems, I would leave them alone.

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post #10 of 17 (permalink) Old 04-17-2011, 06:46 AM Thread Starter
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MadMikeyL,

No, I haven't tried the other stock axles, and I haven't broken any either. But, I've got 120K street miles and well over 100 drag strip passes on my stock V8 axles, and worry that they won't hold up forever with big torque and big traction. Plus, I'm hoping to increase my rwhp by about 75 or so this year. I'll see if anyone here has a set of Mark VIII shafts they are willing to part with.

MikeB
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540 RWHP / 492 RWTQ
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post #11 of 17 (permalink) Old 04-20-2011, 10:48 AM Thread Starter
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Anybody know if there is such as thing as a reman Mark VIII halfshaft which is hardened? I ask because the used parts available seem to be in the 80-100,000 mile range.

I looked at RockAuto and they show the same (very inexpensive) part for T-Bird, Cougar and Mark VIII, so I'm guessing that isn't what I want.

MikeB
1997 Thunderbird Sport
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540 RWHP / 492 RWTQ
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post #12 of 17 (permalink) Old 04-20-2011, 05:05 PM
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post #13 of 17 (permalink) Old 04-20-2011, 07:32 PM Thread Starter
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MitchB,

Thanks for the link. I'm pretty sure these are also the "standard" V8 axles. Would be better than what I have in the car (120,000 mile originals), but I'm going to keep looking.

MikeB
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post #14 of 17 (permalink) Old 04-20-2011, 07:52 PM
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gen2 mark shafts are the strongest OEM shafts period. After that it gets pricey and almost not needed unl;ess you are running a 5 speed.

Spinning pies like wheels.

DD driving my 20 year old project

Now with new ball joints...again
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post #15 of 17 (permalink) Old 04-20-2011, 08:28 PM
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Quote:
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gen2 mark shafts are the strongest OEM shafts period. After that it gets pricey and almost not needed unl;ess you are running a 5 speed.
I'm getting the same part # through NAPA concerning MK8 axles from 1993-1998...

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post #16 of 17 (permalink) Old 04-20-2011, 08:41 PM
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Well mine came from a gen2 1998 mark lsc and you can read that statement all over this site. How did so many technical people get confused, if its not true? LOL Im sure Ford used 96 parts on a 97 sp maybe they didn't want to label a mistake like that for you to find with separate part numbers. I will write down the tag on mine when I pop the wheel off one day.

Spinning pies like wheels.

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post #17 of 17 (permalink) Old 04-20-2011, 08:52 PM
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Quote:
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Well mine came from a gen2 1998 mark lsc and you can read that statement all over this site. How did so many technical people get confused, if its not true? LOL Im sure Ford used 96 parts on a 97 sp maybe they didn't want to label a mistake like that for you to find with separate part numbers. I will write down the tag on mine when I pop the wheel off one day.
Mine also came from a 98 LSC and IIRC, the part number on the shafts was F5LW-AA.

The reason you find one part number for any 89-97 MN-12's or 93-98 FN-10's is because they will all physically fit any of those vehicles.

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