80 Mirada,

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working on building a dual snorkel breather
 
Just read all 9 pages....what a beauty! Interested in the Cherokee rear disc setup. What was done in the front? Driving mine home today, the brakes are weak, and I noticed underneath the car that the parking brake cables arent even hooked up.
 
The fronts are B/R body 11.75 rotors and caliper mounts with stock calipers. DoctorDiff carries the brackets and then you just need rotors for a 78-9 Cordoba or 79-81 St Regis. The rear discs are off of a 96 Grand Cherokee, 04 Liberty are similar and both pretty much bolt right on. The park brake cables are the hardest part of the swap.
 
Doctor Diff caries the rotors too. $150 for the pair and they're slotted/drilled/plated. I didn't think it would make nearly as much of a difference as it did in the braking performance. Was really surprised.
 
80mirada said:
The fronts are B/R body 11.75 rotors and caliper mounts with stock calipers. DoctorDiff carries the brackets and then you just need rotors for a 78-9 Cordoba or 79-81 St Regis. The rear discs are off of a 96 Grand Cherokee, 04 Liberty are similar and both pretty much bolt right on. The park brake cables are the hardest part of the swap.
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...and you're running an 8 3/4 rear end, correct? The Cherokee brackets are used, and I believe you had to open the center hole a bit. I gotta go back and re-read. So I would need DoctorDiff front brackets, stock Mirada cals, and Cordoba/St. Regis rotors? Soon I'll go thru my brakes...I feel like the rear drums are not adjusted properly and the front is doing all of the stopping.
 
The Cherokee rear disk brakes and the Liberty/Wrangler rear disk brakes are similar but different (nothing interchanges between the two groups). The Liberty rotors are a lot easier to find, Liberty parts are less expensive and I hear the Liberty system works better – but either version has to work better than drums.

Either system (Cherokee or Liberty/Wrangler) will fit onto 8¼” or 8¾” differentials (as well as 7¼” and 9¼”) - but the 8¾” is a bit more tricky because of the axle side clearance setup (if using the factory adjustable axle bearings – which are high recommended for street usage).

I don't know about Cherokee backing plate hub sizes (needing ground out) but the Liberty system is a straight bolt-on affair.

MiradaCMX80 said:
and the front is doing all of the stopping.
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The fronts do 60% (or more) of the work on pretty much any car. If feels more like 80% of the work, on my cars. I think this is why Chrysler never do much with rear disk brakes because of the amount of work they performed vs. production costs (maybe).
BudW
 
I'm running and 8.25 rear. The Liberty setup is easier to find in Salvage yards. Crown Automotive offers assembled backing plates and brackets. The two setups are essentially the same, but dimensions are a little different.
 
80mirada said:
I'm running and 8.25 rear. The Liberty setup is easier to find in Salvage yards. Crown Automotive offers assembled backing plates and brackets. The two setups are essentially the same, but dimensions are a little different.
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I'll really consider this for mine. I crawled under the car last night and it appears to be an 8 1/4 axle (oval diff cover, 10 bolts, straight axle tubes.) Perhaps when I have the 3.23 gears installed, I can do the brake swap. What about a proportioning valve?
 
Alto clutches, to increase the number in each clutch pack. Either a 5.0 or 4.2 kickdown lever, new springs in the front clutch, possibly a beefed up rear planetary, and a shift kit.
 
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