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10-16-2002, 04:35 PM
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31 spline 9 inch ford
Need your help
how much will a 9 in 31 spline rear take? I have 1950 chev cp big block[450-550hp] HELP! 
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10-16-2002, 04:55 PM
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a 9in rear properly set up will take anything this side of a nitro fueled dragster. back in the old days chevy men didn't use them and spent fortunes trying to keep 12bolts together, or they put dana 60's in between the rear wheelwells, they all were told that the hypoid angle was all wrong on the ford and they wasted horsepower, how wrong can this be. I had a B/Gas car that would eat chev- olds pontiac- rears for lunch, put in a "junk" 9in ford and didn't break anymore rear ends (went to driveshafts clutches and trannies )
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10-16-2002, 05:39 PM
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I never managed to kill a 9 inch with my 460 and alot of nitrous, c6 forward clutches were another story
 , and then i fragged the motor, such is racers luck
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10-16-2002, 06:14 PM
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Not all 31 spline 9-inch rears are the same. Just because it's a 31 doesn't mean it's the toughest. If you check out this link <a href="http://www.dfwmotorsport.com/Fairlane/9inchrearends.htm" target="_blank">web page</a> given by 4-jaw a while back look under Types of 9-inch Axle Housings and see the different duty ratings. Of course I still think any 9-inch is one of the toughest rears out there.
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10-16-2002, 08:31 PM
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a 31-spline 9 inch will handle 550hp
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10-17-2002, 06:05 AM
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Thank's To all who gave information,I realy do appreciate it.
I do plan on after market axles{strange}. Thanks Manley
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