Thread: Ford 9" sizing question

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Thanks! The guy I got the rear end from said it was a big bearing ( not sure what that means) I measured from axle to axle and I got 57 + inches ...it was hard to get an exact measurement because there were some loose bolts but from what I can tell so far it seems to be between 57.25 and 57.75 inches wide....now just need to figure out what gears I should be.running for my 49-53 merc motor with original tranny. Also have no idea where to get all the rebuild parts or a.good shop to have it rebuilt at.

"Big bearing" is referring to the bearing at the flange end of the axle. There were two sizes of brgs. The larger brg has a 3.15" outside diameter and a larger inside diameter also. The smaller brg is 2.83" od and has the smaller id. Big bearing and small bearing. Either will be fine. The flathead guys will have to help you with the correct gear ratio.

maybe this will help...
http://www.boyerfour.com/mustang/rea...g_ford_8_9.htm
any 9 inch third member will fit that housing, becareful not to get a 9.75 third member from a mercury.... with your flathead I`d say 323 to 350 gears would be good compromise.

I forgot to tell you guys if you click on the white rectangle it will enlarge to read it....

thanks Rich....i'll be checking all the specs over the weekend and keep everyone posted. Here go some pics of the progress on the c-notch and 4 link......