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It depends on the weight of your car and what kind of traction your getting, its usually torque (from getting traction) that will break them. But an 8" will usually take 350-375 on street tires if its in good working order.

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1991 LX Mustang 347 C4 combo 11's with the AC on.
1984 Mustang GT 460, Powerglide "Still putting it together" hoping for 9's !!

<font size=-1>[ This Message was edited by: dfree383 on 3/18/06 3:19am ]</font>
 

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Ran some 1.38's with my old Maverick 8". Swapped in a 9" not long after...never had anything wrong with the 8" but I just needed a better gear selection. 4.62 was too low and 4.11 was too high. Had to put the 9" in for the 4.30's and it worked pretty good. Car was all stock suspension back then...with a 393w/powerglide.
 

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I've put 300hp to the ground dumping the clutch at 6200 rpm on 28X10.5 slicks and 4.11 with a deroit locker in my 8". 1.55 60ftin a 2100 lb car.

I finally broke the stock 28 spline axles twice, before I switched to 31 spline racing axles and 31 spline mini spool for my 8".
 
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