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Alright i have a 9 inch rear end with 3.00 gears in my backyard that is complete from drum to drum. I had all new brakes put on my 8 inchernot too long ago, so will those brakes fit the 9 incher? also how much will it cost to get my 9 rebuilt? any ideas? it has the gear ratio i want so i wont buy new gears unless i have too.

1968 Mustang Coupe - Daily driver
289, holley 600 carb, holley street dominator intake, petronix ignition, Accel Super Stock Coil, Tri-Y Headers, 2 1/4" 2 chamber Flowmasters, C4 and 2.79 rearend
 
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Providing it is a standard car housing the brakes should fit no problem-swap backing plates etc.

1967 S code GT Deluxe Coupe 65B
1966 Convertible 76B 289 4 speed

Descendent of Francois Seguin dit Laderoute,
Soldier Regiment d' Carignan, New France 1665-1668
 

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KBSTANG is correct, if it is of the common "small bearing" design, the 8-inch backing plates should work just fine. I'm thinking rebuild kits run about $125 from JEGs and Summit. If you take it to a shop to be rebuilt, count on spending about $500. I had a 9-incher custom built starting with the axle housings from my 66 8-inch grafted onto a nine-inch center housing. With 3.25 gears (new), 4-spider pinion set up and Trac-Loc: $1000

Glenn Morgan: 66 GT V-Burgundy Fastback 351w+toploader+9 in. TracLoc. Started out as a rusted-out Chicago-area crusher. After sacrificing a solid 66 coupe for its sheetmetal sub-assemblies, I have one solid (and expensive) work in progress!
 
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Hey Glenn, I was wondering if that could be done, grafting a 9" center onto the 8" axle tubes, how did it come out?

1967 S code GT Deluxe Coupe 65B
1966 Convertible 76B 289 4 speed

Descendent of Francois Seguin dit Laderoute,
Soldier Regiment d' Carignan, New France 1665-1668
 

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That thing is a work of art. The local (Denver) differential guy sends bare 8-inch housings to some place in IL. Someone there cuts off the axle housings and welds them onto 9-inch centers. Since 65-66 9-inch housings are very rare and expensive, this is a very attractive alternative. All the local early Mustang/Falcon/Comet guys here swear by these things. He even added new wheel bearings, 67-70 brakes, and little gussets on the spring saddles to keep them from being ripped off the axle housings when you dump the clutch at 5k.$1000 is alot of money - but I think I've received alot of value here. The axle is probably overkill, but it is one thing I'll never have to worry about.

Glenn Morgan: 66 GT V-Burgundy Fastbac
 

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I CAN DO THE 8 INCH TO A 9 INCH SWAP. IT RUNS AROUND $200.00 WITH YOUR 8 INCH HOUSING. I SUPPLY THE 9 INCH HOUSING PARTS. IT IS A NICE ADDITION TO ANY OF THE OLDER MUSTANGS. IF ANY OF YOU WOULD BE INTERESTED CONTACT ME BY E MAIL. AND IF YOU HAVE A CHANCE SEE MY PROFILE AND HOME PAGE. THANKS DENVER
 
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