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Rear Question

1K views 7 replies 6 participants last post by  home brew 
#1 ·
How can a 7.5 posi with 373 gears be "Beefed Up" to hold 550 - 600 HP?
 
#5 ·
I blew my 7.5 in my 86 cutlass with my a 300 (maybe) horse 350. It had 3.42 gears and posi with 255/65/15 rubber. When I took it apart all most of the spider gears were broke. The cure would be a better posi unit but then you would probably break a pinion or axle. Its not worth the money IMHO.
 
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