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will a rear form a 95 9c1 fit in a 94 b4u .the b4u has drums:mad: and hate them are the control arms and swaybars the same will ebrake go in the same place .do i have to replace the prerortion thanks a lot
 

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The rear end assembly will bolt up fine. You will however have to replace the rear parking brake cables and add in the flex lines that go from the metal brake pipe to the calipers, a prime opportunity to upgrade to the braided stainless steel Teflon lines. I would also recommend replacing the control arm bushings, or better yet upgrade the rear control arms with either stock length or extended length upper and lower control arms. - Peter
 

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Its just a piece of rubber hose that runs from the brake caliper to the brake hard line. The drum brake cylinder just bolts straight to the hard line, but as the caliper rotates to change the brake pads it needs a flex line. - Peter
 

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Yep, take the rear parking brake cables off the 9c1...from where they attach to the front parking brake cable to where they attach at the brakes.
 

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no...combination (proportioning) valve is the same 94-96, all models, disc or drum rear

You may not realize this--to swap in the 9C1 rear axle, you will end up with the rear wheels sitting deeper in the wheel opening on each side by 5/8".

Also, gear ratio will be different and you will need to do a PCM reflash to correct speedometer.

You can take the disc brake system components off of the 9C1 axle and just transfer them to the B4U axle, too.
 
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