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Old 03-12-2006, 10:18 PM   #1 (permalink)
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Disc brakes for a CJ 5

A friend from another town just bought herself a 1974 CJ 5 and would like me to put a disc brake conversion on it. Questions I have are..... What axles came under a CJ 5 in 1974 and where should I look for a conversion setup? I haven't been able to get over to her to see what axles are under it myself. If I do.... What will tell me what axle they are?
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Old 03-12-2006, 10:35 PM   #2 (permalink)
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`72-`75 CJ5 had Dana 30 front and Dana 44 rear.
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Old 03-12-2006, 10:48 PM   #3 (permalink)
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Thank you.
Is there something on the axles to confirm that they haven't been changed?
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Old 03-13-2006, 07:21 AM   #4 (permalink)
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Just measure them and see if they're 51" WMS to WMS. Also the front 30 is an open knuckle. The rear 44 is a center pumpkin which is somewhat specific to the 72 to 75 model years. You can identify the 44 just by looking at it.
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Old 03-13-2006, 09:31 AM   #5 (permalink)
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Easiest source for a disc conversion is to find somebody selling or parting out a 77+ CJ axle with discs. Swap everything from the balljoints out. You may also elect to retain your drum hubs with the stronger 6-bolt lockouts, in most cases these are a direct swap (just get longer studs to press on the rotor).

Once the axle side is done, swap in a '76-78 or so CJ w/ manual disc brake master cylinder, since the drum brake MC won't push enough fluid to clamp the discs well at all.

In the interest of full disclosure, I happen to be parting out a mid-80's CJ axle.
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Old 03-17-2006, 08:57 PM   #6 (permalink)
 
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Thread from another board.

http://bbs.off-road.com/ubbthreads/s...ue#Post1478420

I've researching this and here is what I've come up with so far. Would appreaitate any info or corrections. Going to the Salvage yard on Saturday. Not interest in going to a Dana 44 at this time, I have an ARB in my Dana 30 now.
Three ways to go:
1.) Buy a custon kits, $800 to $1100 Way too much for my budget.
2.) find a Dana 30 with disc brakes and swap all the parts.
Not sure what Vehicles to look at, CJ's and ???
3.) Build from GM & CJ parts from Salvage yards.
Calipers
1971-78 Chev or GMC ton or light duty ton 4x4 w/Dana 44
Caliper brackets (6 bolt)
1973-91 ton Chevy 4x4
1970-86 GM ton 4x4
1974-78 Blazer or Jimmy
Jeep or IH Dana 30s w/six bolts
Jeep Waggoneers ? What years?
Spindles (disc brakes)
1977-86 CJ
1972-76 GM,
Hubs (disc brakes or have drum hubs milled)
1976-81CJ
Rotors 11.75 x 1.20
1977-78 CJ (1 1/8 thick)
Master Cylinder (prefer lines on passenger side)
CJ or waggie with disc/drums
1972-76 A GM Cars (ElCamino,Nova,Firebird,etc w/disc-drum setup)
Proportioning Valve
1976+ GM (any Drum-Disc Vehicle)
Wheel Studs 10 ea (longer) x 20 TPI x ???
Dorman pn 610106

Questions I'm still looking at:
1.) What year Waggies work. Reason I ask, I know where a 1980 wagie is sitting but has driver side drop. Is it different that pre-1980's with driverside drop?
2.) The GM donors are all Dana 44's?
3.) Dust Shields & backing plates?
4.) What vehieles had Dana 30's with disc that swap to my '73 dana 30? CJ's 1976 to ???, Waggies ??? FSJ???

Thanks for any & all help.
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Old 03-18-2006, 10:46 AM   #7 (permalink)
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The Waggie Dana 44 will have 6 bolt wheels, so by itself it will not have all you need. The easiest solution is to find a 1977-1986 CJ and swap ball joints out over to your axle. Some 1976 CJ has discs, too, but it was an option. You really want a 1980 or older CJ if possible due to the stronger 6 bolt hub that accepts premium lockouts. Warn doesn't make a premium lockout for the 5 bolt hub in the 1981 or newer axle.
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Old 03-18-2006, 03:04 PM   #8 (permalink)
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In the tech section of the JP magazine web site has a disk brake conversion article. I dont remember the exact parts that were needed but it was there...

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Old 04-11-2015, 06:34 AM   #9 (permalink)
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Quote:
Originally Posted by Non Urban View Post
A friend from another town just bought herself a 1974 CJ 5 and would like me to put a disc brake conversion on it. Questions I have are..... What axles came under a CJ 5 in 1974 and where should I look for a conversion setup? I haven't been able to get over to her to see what axles are under it myself. If I do.... What will tell me what axle they are?

hi my name is jay i got a 74 cj5 i just swapped a 1980 front dana 30 in just swapped the whole rear as im changing the front and back ratios but the issue im having is the back brakes are skidding this is a woods truck so i didnt want to get into the paportioning valve if didnt have to i thought the lines were backwards so i switched them big resavoir is now hooked up to the back brakes well any help would be app. ive read all of the threads on this some say change the praportion valve some say no my front brakes arent even wiping the surface rust off the rotors
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Old 04-12-2015, 12:23 PM   #10 (permalink)
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I just swapped in front disc's on my 75. After researching and looking for the needed JY parts, I decided to buy a kit from R&P 4 wd.. Was on sale at the time. Has all the parts you need, and good instructions.. It included new bearings etc.. I live in the stix so not much JY stuff available.. Besides my time is worth something..
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