ford 9" problems - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-03-2001, 08:37 PM
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ford 9\" problems

Heres the deal. A friend just bought a 73 bronco with a ford 9 inch rear end. Once we got the engine running and went to drive away the rear drive shaft turned but the bronco did not move. the drive shaft could be turned by hand yet the car did not move. assumeing the ring gear blowen we pulled the axles and 3rd member.

the axles are not broken and splines are good. the spider gear splines look good and the ring and pinion are good. when we put the axles in the 3rd member with it out of the case. everything acts as it should. (we turn the pinion and the axles turn. needless to say I am very confussed and starting to question my sanity here.

Has any one seen anything similar. or is this some sort of fluk.

Thanks for any help.

Wilhlem

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post #2 of (permalink) Old 03-04-2001, 10:20 AM
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Re: ford 9\" problems

Check the INPUT yoke on the front of the diff where the driveshaft connects to the pinion. If it's stripped, it would have enough grip to spin the axleshafts alone, but NOT propel the truck. Do the whole test again (with the diff out) with some serious resistance on the axleshafts and see what's not turning.

Steve 83 Bronco 4.9L
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