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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: MCTPhoenix]
#57418
04/23/08 09:56 AM
04/23/08 09:56 AM
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Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart
master
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master
Joined: Jan 2003
Posts: 8,144
Arkansas
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I did the swap on my 8 1/4" rearend.
The caliper mounting brackets bolted right up.
I'm not familiar with the 8 3/4" mounting flange.
The 8 1/4" uses four bolts. I was told the 8 3/4" has five.
Your life is not my fault.
My life is none of your business.
Speech is free only if you agree with those in control.
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: 340727dart]
#57419
04/23/08 10:02 AM
04/23/08 10:02 AM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
master
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master
Joined: May 2004
Posts: 4,920
Joplin, MO USA
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I've done it on my 8 3/4. The fifth hole needs drilled, easy. I used the green bearings and I machined a step in the bracket so that the snap ring would sit in the bracket exactly the same distance of the old drum backing plate. The only thing that I didn't consider was the thickness of the rotor which was thicker than the drum, so.....the whole rearend is a little wider like 1/4 total so an 1/8 wider on both sides. Hope this makes since.
Moparlee
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: moparman383]
#57421
04/23/08 01:17 PM
04/23/08 01:17 PM
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Joined: Sep 2007
Posts: 576
Escondido, CA
kick_the_reverb
mopar
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mopar
Joined: Sep 2007
Posts: 576
Escondido, CA
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I got excuses up the yingyang as to why I have had all the parts for the conversion (for 2 years), but haven't done it yet. I will be using the 94-98 Jeep Grand Cherokee master cylinder in combination with F body front calipers. This will be on an A100 van, and a few people have done it with good results. They claim to have checked the piston volume on the F body as compared to the Jeep front calipers and found it close enough. So, take it as second hand information, but from people I trust.
Ran
"Hey mister, something's wrong with your car, it idles roughly" - number one comment I got in Israel when daily driving a 70 Barracuda with a lopey cam.
Currently working on - 1966 Dodge A100 van 318/auto
Finally - disc brakes on the front.
In the plans - rear disc brakes, B&M 250 blower
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: Robbins]
#57422
04/23/08 08:34 PM
04/23/08 08:34 PM
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Joined: Aug 2007
Posts: 294
Phoenix, AZ
MCTPhoenix
OP
enthusiast
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OP
enthusiast
Joined: Aug 2007
Posts: 294
Phoenix, AZ
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Quote:
I've done it on my 8 3/4. The fifth hole needs drilled, easy. I used the green bearings and I machined a step in the bracket so that the snap ring would sit in the bracket exactly the same distance of the old drum backing plate. The only thing that I didn't consider was the thickness of the rotor which was thicker than the drum, so.....the whole rearend is a little wider like 1/4 total so an 1/8 wider on both sides. Hope this makes since.
Lee, did you have to use the green bearings? It sounds too easy... drill the 5th hole and it all falls into place? You even used your original e-brake cables? Is the thickness of the bracket which replaces the drum backing plate the same as the drum backing plate. More details please and THANKS!
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: BlakDak]
#57426
04/24/08 10:44 PM
04/24/08 10:44 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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for those that have done this, let's get some GOOD pictures and crystal clear explanation as to what was done, and what the swap cost you.
seems like a cheap easy swap for rear discs using junk yard parts...but is it really cheaper than some of the kits on the market?
I've heard of this from several places, but a few years ago, I posted the question on here, and didn't get much response, if any. so I figured that if anyone had done it, it was NOT easy, and NOT cheaper than kits currently available.
**Photobucket sucks**
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: 70Cuda383]
#57428
04/25/08 12:11 AM
04/25/08 12:11 AM
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Joined: Aug 2007
Posts: 294
Phoenix, AZ
MCTPhoenix
OP
enthusiast
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OP
enthusiast
Joined: Aug 2007
Posts: 294
Phoenix, AZ
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Quote:
is it really cheaper than some of the kits on the market?
I figured that if anyone had done it, it was NOT easy, and NOT cheaper than kits currently available.
Well, I tried cheap and got cheap with the scarybird crap. Long expensive story but the real problem is the integral parking brake on the GM calipers is a pain; combine that with the fact the brackets aren't perfect and don't allow the calipers to run parallel to the rotors yields uneven pad wear and that contributed to terrible pedal height and feel. So, I'd like a solution that eliminates calipers with an integral parking brake.. and uses an oem bracket for rigidity ( modified if needed )and off the shelf parts where I don't have to have rotors machined or drilled or any other nonsense. You can get cross drilled and slotted rotors for the Jeep for less than $100 bucks a pair; it seems to be a nice bolt on if it can truly be done with little trouble.
I'd like to see some pics or get some details. I've tried Dr. Diff and hope he has some of his kits at Spring Fling but he uses Ford calipers with integral parking brake and I don't know about the rotors etc.. off the shelf? The way things are now is the rear discs look cool but the system worked better with drums and right now I've got a 4500lb car putting 480hp to the rear wheels that doesnt wanna stop but I may go back to drums. UGH ! Thanks for the allowing the rant!
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: 70Cuda383]
#57431
04/25/08 07:24 AM
04/25/08 07:24 AM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
master
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master
Joined: May 2004
Posts: 4,920
Joplin, MO USA
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Quote:
and what the swap cost you.
seems like a cheap easy swap for rear discs using junk yard parts...but is it really cheaper than some of the kits on the market?
I've heard of this from several places, but a few years ago, I posted the question on here, and didn't get much response, if any. so I figured that if anyone had done it, it was NOT easy, and NOT cheaper than kits currently available.
I've got $125 in mine with out the e-brake, which will change once I'm done with it. That's a lot better than a $500 dollar kit. Anyways that the cheapest kit I've seen. I can also go up to the parts house and buy parts.
Oh, and no welding required.
It's all in where your at when it comes to prices. My cousin up in K.C. got the same stuff cheaper than I got the stuff out of the salvage yard down in Branson, MO. So......I ended up with his stuff, cause he sold his car before putting them on. So now I have the e brake stuff.
As far as the 8 1/4 rear, it's too easy for that, cause the rear ends in the GC's are basically the same set up. They use the c-clip's to hold the axles in. So no need it drilling the fifth hole. Oh, you do need longer studs, which I went to the dealer ship and order some from a 2005 1/2 ton truck with rear disk brakes. Theses are the studs that hold the backing plate on the c-clip rears or the the same studs for the green or original bearings for the axles in the 8 3/4 rears.
Clear as mud?
Moparlee
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Re: Grand Cherokee Discs on 8 3/4 Rear?
[Re: Robbins]
#57433
04/26/08 10:04 AM
04/26/08 10:04 AM
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Joined: Aug 2007
Posts: 294
Phoenix, AZ
MCTPhoenix
OP
enthusiast
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OP
enthusiast
Joined: Aug 2007
Posts: 294
Phoenix, AZ
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Quote:
Also I forgot to mention when machining the step for the snap ring on the green bearing I also had the make the hole in the center of the caliper bracket a little bigger to go around the green bearing itself some.
Lee, If you didn't use the green bearing would you have to machine the step? I'm going to try to locate some used parts and try this. Sounds like if the standard bearings dont need the step for the snap ring I may only have to open the hole a little for the bearing clearance?
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