FC3S Differential Pinion Brace (By Ray Platek)

[atli126]

Got the poly installed into the s4 rear sway bar link tonight.

Hoping it all goes back together and plays nice tomorrow but I'm sure it'll be a bitch. Ol Betty white is always a bitch to work on...



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[atli126]

So it was pretty tough but we got it back together. Went back to the mazdaspeed diff mount vs the lucky10 custom mount setup.

I know it might not look like the 2 nuts are on there enough but when we remade the new box and tabs we used 3/8 steel and almost made it too thick. So thats the best we could do but it's a very thick wheel nut or trailer nut, it's only about w threads off from being fully threaded. We also put the gooey red lock tite on it. So I think it'll hold.

Just gotta go back to my buddy's tomorrow and put the exhaust on and drive it home!

So now it has Mazdaspeed front and rear diff bushings, 3/8s steel box and tab, delrin subframe bushings, ronin stg2 camber dog bone, pinion snubber and the s4 sway bar link with poly bushings

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[atli126]

Fc is solid... For now hah! drove it around and home tonight and it's pretty legit. Hopefully this setup will stay clunk free for a while... At least until maybe I can swing a ronin 8.8 kit like next winter [emoji14]

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[DrivinSidewayz]

You CANNOT run a solid front diff mount with rubber subframe bushings. You will rip the mounting tabs off the subframe.if you want to keep it a street car, replace your mazdacomp front mount.

hey i have a solid diff mount, with rubber subframe bushings. the diff mount bracket on the subframe ripped off. are you saying i need poly subframe bushings? or solid? so that the front diff bracket wont rip off?

[SOB Racing]

I'can't keep this setup living on mine.   I've tried reinforcing the madzacomp mount, the mount welded off the bottom of the cradle, have a pinion snubber,  I've got poly cradle mount with aluminum plate retainers holding the diff to the body etc.    But the torque of the link bar bends both the rubber mount and the link bar mounts.

Has anyone seen a design that surrounds the front of the diff and has a link on the centerline of the diff so the force excerted is straight down?

[atli126]

Nope I think it's a temp fix until the Mazda comp breaks and you have to replace it. The first one I had lasted a few seasons and years of racing. But I think the best option is the ronin 8.8 setup

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[SOB Racing]

I have no doubt the Ronin setup would be a good fix but $2k makes one look for other options.