1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

How much HP can the stock SE rear end handle?

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Old 10-05-08, 04:08 PM
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How much HP can the stock SE rear end handle?

i recently picked up a gsl-se, and am just curious, before i start screwing with my motor how much can the rear end handle, hp and tq wise,
Old 10-05-08, 04:41 PM
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300 hp without a lot of clutch dumps at the track, torque, maybe around 250, best guesstimate. You'll need to do some serious forced induction to get an SE engine to push the limits of the rear end, discounting wear, age and metal fatigue of the diff and axles.
Old 10-05-08, 05:23 PM
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well im asking because im being bothered by my mustang buddies to do a v8, with guess what a 5.0, so will my stock rearend be able to handle it

- now im not really thinking about doing it but, im very curious as to weather or not i can
Old 10-05-08, 06:12 PM
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Weld it up and it'll handle the jandal. Then your gearbox wont...

Your lucky i've got a ****** lightweight SA rearend! I'm scared to drop the clutch haha!
Old 10-05-08, 06:20 PM
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A 5.0 is gonna have a hell of alot more torque than the 13b it replaced, and the torque is what really puts the stress on the rear axle.


On a side note...don't do a v8 swap.
Old 10-05-08, 08:19 PM
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if your going to do a v8 swap, you will need a 8.8 rear end. the original mazda rear end will not take the torque of the v8 not to mention its harder on the rear end to push around that heavy *** v8.
if you keep the rotary and turbo it it wont make as much torque so it will be fine
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