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Old 02-14-2004, 08:30 AM
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Ford 9 inch

Found the right width 9 inch for for my 48 Chevy 5 window. It is from a 1968 Ranchero, 61 1/4 inches (wheel mounting surfaces) 3.0 gears, small axle bearing. Seems to be excessive slack when you rotate the the pinion. Would it be worth the expense to change the bearings to the large bearings. The splines in the axel (28 spline) seem to be rounded, should they be sharp V?. I will be using this axel in my Chevy street rod pickup with a midly modified 454 and trubo 400. This is going to be a street driver only.


Last edited by Larry Day; 02-14-2004 at 08:36 AM.
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Old 02-14-2004, 10:04 AM
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A fair amount of slack in the ring and pinion is acceptable. The only way to see if it is too much is to pull the pumpkin and measure it with a dial indicator. You could preload the pinion with a fan belt and get someone to pull down on the fan belt looped around the pinion yoke, while you rotate the ring gear back and forth with a big wrench on the ring gear bolts. You would also apply a gear marking compound (titanium dioxide) to the gear teeth as it is rotated. This will tell you the contact pattern of the teeth. I have been told that Desitin, the baby bottom stuff is a perfect substitute for titanium dioxide.

I would also replace all the bearings in the third member, and new axle bearings a nd seals as well. You just might be able to get by with the existing ring and pinion gear. As far as your axle splines, some one with experience will be needed to tell you if the engagement with the spider gears is excessive.

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Old 02-14-2004, 02:05 PM
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What you have is the small bearing housing. the bearing dia should be 2.835". The big housings bearing dia is 3.150" and not interchangeable. The axle splines should have a flat surface on the top of the spline = \_/ if it looks like this \/ then it's worn out and should be replaced. This also applies to the gear teeth in the carrier assembly and ring and pinion gears. If the ring and pinion teeth are not worn badly, adjust the slack out per factory specs. If the axles are worn as above the splines in the carrier are most likely worn too and the carrier shouldn't be used. The small bearing rear end is tough in stock form and will be just fine for your application. The advantage of the big bearing housing comes into play in high horsepower racing applications. Companies such as: Currie, Chassis Eng and Strange Eng have a lot of 9" stuff.
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