Join Date: May 2003
Location: Tinton Falls, NJ
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
-"Your buddy Mike is INSANE!" -ClintD's dad