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post #1 of 18 (permalink) Old 12-14-2008, 07:33 PM Thread Starter
 
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sc axle ?

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..
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post #2 of 18 (permalink) Old 12-14-2008, 09:39 PM
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All the 89-93 5-speeds got one fat axle and one normal one.

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post #3 of 18 (permalink) Old 12-14-2008, 10:27 PM Thread Starter
 
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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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post #4 of 18 (permalink) Old 12-14-2008, 10:49 PM
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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.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
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post #5 of 18 (permalink) Old 12-16-2008, 08:50 PM
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I was told the Mark VIII LSC axles were the strongest of all axles. There are brand new ones on Ebay right now for 85.00 per axle through a Panoz dealer.

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post #6 of 18 (permalink) Old 12-16-2008, 09:13 PM
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MarkVIII axles are the strongest you can buy new. The SC axles are stonger than the mark ones though.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
-"Your buddy Mike is INSANE!" -ClintD's dad
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post #7 of 18 (permalink) Old 12-17-2008, 03:38 AM
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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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post #8 of 18 (permalink) Old 12-17-2008, 08:19 AM
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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.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
-"Your buddy Mike is INSANE!" -ClintD's dad
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post #9 of 18 (permalink) Old 12-18-2008, 08:29 PM
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Quote:
Originally Posted by MadMikeyL View Post
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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post #10 of 18 (permalink) Old 12-19-2008, 11:24 AM
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Quote:
Originally Posted by MadMikeyL View Post
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.

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post #11 of 18 (permalink) Old 12-19-2008, 01:12 PM
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Quote:
Originally Posted by Jimmy 2Coupes View Post
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.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
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post #12 of 18 (permalink) Old 12-21-2008, 08:01 PM
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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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post #13 of 18 (permalink) Old 12-22-2008, 08:47 PM Thread Starter
 
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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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post #14 of 18 (permalink) Old 12-22-2008, 08:50 PM
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no difference you can run them on both sides if you wish.

stick cars are tough on half-shafts, but the autos tend to take the beating without the power shifting/shock.

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post #15 of 18 (permalink) Old 12-22-2008, 08:52 PM Thread Starter
 
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the ax

Quote:
Originally Posted by TydlwavS View Post
no difference you can run them on both sides if you wish.

stick cars are tough on half-shafts, but the autos tend to take the beating without the power shifting/shock.
thanks : cool topic learned a lot here
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post #16 of 18 (permalink) Old 01-10-2009, 04:13 PM
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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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post #17 of 18 (permalink) Old 02-16-2009, 09:54 PM
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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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post #18 of 18 (permalink) Old 02-20-2009, 03:19 PM
 
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I have both large axels on my 93 auto
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