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Author Topic:   Ford 9" rotors
Dirt Roller

Total posts: 13
posted January 18, 2002 04:43 PM
I am in the process of building my first IMCA type car. I need some suggestions on what type of car to get rotors off of to put disc brakes on my ford 9" rear end with a 41/4" stud pattern. Someone told me that the rotor should be 11 1/2" tall and have a 2" offset but they could NOT tell me what to find them on. Any suggestions would be appreciated

Dirt Freak

Total posts: 464
posted January 18, 2002 07:00 PM
some people use the front rotors off a pontiac 6000, or a jeep cherokee. i think they are around 10 1/2 to 11"

Dirt Freak

Total posts: 464
posted January 18, 2002 07:01 PM
also on some nine inch rear axles you have to turn the axle flange down a bit so the rotors slide on.

Dirt Freak

Total posts: 379
posted January 18, 2002 07:18 PM UIN: 25419780
I have 3 set of rotors that fit a ford 9 inch with out cuting flange .. I beleave its the 4 1/4 bolt .. one set is of a lincon the other to are off a 95 exsplore

Dirt Maniac

Total posts: 183
posted January 18, 2002 07:42 PM
Just learned this today. The early Jeep rotors are not a pure cast iron as we would consider them. They contain a material for comfort feel for the driver. (whatever that means) Anyhow, this special blend of rotor material is no longer being used due to the rotors warping from heat. I've run the old rotors on dirt with no problem, maybe asphalt guys cant use them. Or, if any forum readers drive Jeeps and the good feel has left the brake pedal, you now know why.

Dirt Newbie

Total posts: 4
posted January 20, 2002 08:37 AM
You might try late model crown vic disc brake rear rotors and need to machine the inside alittle to fit over the drive plate and fab mounts.Small and lite.

Dirt Full Roller

Total posts: 29
posted January 20, 2002 02:41 PM
i used to run a non floater 9in and i used front discs off a late 70s half ton dodge 4x4. they are about 20.00 each at a wrecking yard, you might have them turned down a bit.

Dirt Roller

Total posts: 14
posted January 22, 2002 09:38 PM
first of all im not sure but the bolt pattern on your 9in axles should be 41/2 on 5 or 5 on 5 most likely 41/2 if thats the case i used rotors off the front of a late model crown vic or ltd they are hats onthose cars i had to slightly ground down the axle to let them fit over the axle but the are the 2 in offset and the are 11 in i belive id have to check mine allso what work really good is front rotor hats off of a bronco i used to work in a parts store for 10 yrs so i had the benifit of looking these parts up and trying them b 4 i went to a junk yard or just buying them new... any more ? id love to help

Dirt Roller

Total posts: 13
posted January 24, 2002 08:51 PM
thanks for the info!

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