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ford 9 inch

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429fairlane
Member


Joined: 05 Dec 2006
Posts: 50
Location: British Columbia Canada
ford 9 inch

Can some one tell me if there is an easy way of telling if a ford rear end is a 9 inch or not also if it is posi or not Question
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Clint
1967 fairlane convertible
429 in progress

Post Mon Mar 12, 2007 3:16 pm 
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GerryProctor
Senior Member


Joined: 10 Mar 2006
Posts: 660
Location: San Antonio, Tx

The easy way is to try to get a deep well socket on the bottom bolt of the housing. If the socket won't go, then it's a 9. The pinion support gets in the way of the socket. An 8" will easily fit a deep well on the bottom bolt.

As to how to tell if it's a limited slip (Posi or Positraciton is a GM term. Ford used Equalock and TractionLoc) if it's just the housing, you can look at the case. If it is scalloped where the ring gear bolt heads sit, then it's a limited slip. For an assembled unit, rotate the axle and have someone watch the opposite axle. If it spins in the same direction, then it is likely a limited slip. If it turn counter direction then it is likely an open differential. But a worn open and behave like a limited slip and a worn limited slip can behave like an open.

And if the rear tag is still attached to one of the bolts on the housing, you can decode it to determine the type and gear ratio.

Post Mon Mar 12, 2007 7:18 pm 
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429fairlane
Member


Joined: 05 Dec 2006
Posts: 50
Location: British Columbia Canada
9 inch

Thanks for the info gives me a starting point Very Happy
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Clint
1967 fairlane convertible
429 in progress

Post Wed Mar 14, 2007 3:59 pm 
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