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Discussion Starter #1
ok have two auto s 89 ,90 both have two 1 inch rear shafts

parted a 92 5 spd this one has one large 1 1/2 one 1 inch is this typical of a five spd car or an anomoly ? Possibly I can dig thru the forums . If u could answer it would help.. :2huh:
 

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All the 89-93 5-speeds got one fat axle and one normal one.
 

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Discussion Starter #3
axle foley

thanks mike
is it safe to say those are much stronger and worth using than the auto ?
or over kill I have a set and when I over haul the rear thinkin swap em out. ?
craig
 

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I'm not sure if they are stronger or not. Some people say they are, and some even go so far as to run 2 fat axles, but 99% of the time when an axle fails on one of these cars, it breaks right off at the spindle, and since the outer par of the axle is the same on all of them, I don't think it would be an issue. I have also heard people say it was done to try to reduce wheel hop, which the 5-speed cars have serious problems with. Unless we get a hold of the engineer who decided to make the one shaft thicker, we may never know.

As for whether you should swap them in or not, I would say it probably isn't necessary. Pretty much only the 5-speeds break axles because driveline shock is what breaks them, not power. Since the auto loads the axles up and then keeps them loaded, the autos don't have any real problems breaking axles. Some guys are even running 11s passes on stock SC axles, and as long as they have an auto instead of a 5-speed, the axles hold up. If you happen to grab a set while parting out a car, its good to have a spare set of axles laying around in case something happens, but if there is no problem with your axles now, I would leave well enough alone.
 

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MarkVIII axles are the strongest you can buy new. The SC axles are stonger than the mark ones though.
 

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I didn't think there was any difference between the Mark VIII axle and the V8 MN12 axle.. ???
 

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There definitely is a difference. If you put the 2 axles side by side, you can see the Mark axles are much thicker. And then SC axles are thicker still.
 

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All the 89-93 5-speeds got one fat axle and one normal one.
94 and 95 five speed SC's also came with one fat axle (fat shaft) and one normal one.
 

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I'm not sure if they are stronger or not. Some people say they are, and some even go so far as to run 2 fat axles, but 99% of the time when an axle fails on one of these cars, it breaks right off at the spindle, and since the outer par of the axle is the same on all of them, I don't think it would be an issue. I have also heard people say it was done to try to reduce wheel hop, which the 5-speed cars have serious problems with. Unless we get a hold of the engineer who decided to make the one shaft thicker, we may never know.

As for whether you should swap them in or not, I would say it probably isn't necessary. Pretty much only the 5-speeds break axles because driveline shock is what breaks them, not power. Since the auto loads the axles up and then keeps them loaded, the autos don't have any real problems breaking axles. Some guys are even running 11s passes on stock SC axles, and as long as they have an auto instead of a 5-speed, the axles hold up. If you happen to grab a set while parting out a car, its good to have a spare set of axles laying around in case something happens, but if there is no problem with your axles now, I would leave well enough alone.

Agreed....fat axles with greater mass were intended to reduce wheel hop and are not any stronger than the standard diameter axles. I'm still using stock halfshafts in both of my SCs.

David
 

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94 and 95 five speed SC's also came with one fat axle (fat shaft) and one normal one.
I wasn't sure on that, since I've never seen the underside of a 94/95 5-speed, so I didn't want to say that they did come with them without knowing. Good to know though.

And if there was any doubt about the strength of the SC axles, the fact that Neibert is still running stock axles in a full weight SC with a 700hp+ turbo'd 347 should put people at ease.
 

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Mark VIII LSC shafts from the last 3 years are the strongest of all the MN12 shafts. They used a different hardening process but they are only a hundred Newton Meters stronger in yield (3900 vs. 3800 for the SC shafts) so not worth the upgrade IMHO but if you have to replace one might as well go with the strongest ones available!!!!
 

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Discussion Starter #13
fat ax

Original question : I have a fat shaft and wanted to see if worth the effort to put in car ? also wanted to see if you can run too .? not knowing without setting them side by side if there is any difference side to side. Seeing that david n. is running consistant mid 10 s on standard sc axles dont see what difference it makes ..really .
 

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yea i agree. i was thinking about that. i wanted to change my axles but this thread just answered my question lol
 

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[QUOTEyea i agree. i was thinking about that. i wanted to change my axles but this thread just answered my question lol ][/QUOTE]
I'll second that.
 

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I have both large axels on my 93 auto
 
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