Disk brakes

I've been searching and haven't seen quite what I'm looking for however I have gotten a lot of great tips and ideas on how I could spice up my 1975 CJ5. The next move I'd like to make is get disk brakes on the front of me jeep. The drums just have to go. It has a dana 30 with a 3.73 gear ratio. My friend scrapped out a late 70's CJ7 ages ago and still has the dana 30 off the front end. Howerever it has a 4:10 gear ratio. Before I start tearing stuff apart. Does anyone know if I can swap part between these?¿?. If not, what would be the best route to make the change without buying a $900 kit. Any help would be greatly appreciated. :?

 

that late 70s CJ front end would be a great donor for everything from the housing Cs on out.

 

Here ya go.....

http://trailforge.com/cms/index.php?option=com_content&task=view&id=19&Itemid=30

 

Yup, swap it all out for the later stuff, and while you are in there, replace the 30+ year old balljoints.

 

Recieved thanx so much. One more thing, dou you know if I have to do anything special with the brake lines? Or will the stock ones work?

 

fittings are different on the hoses at the brake side, so you will need the stock disk brake hoses.

 

Ok, thats great. I was just hoping that I didn't have to install a new MC.

 

Help So, I get the front axel from my friend and he knows less and less about it as time progresses. He doesn't know the year of CJ7 it's off of or the gear ratio, only that its a dana 30. (He's now thinking its possiblty an early 80's) It looks like I can swap parts from the knuckle out to get my disk brakes. By looking at the pics would anyone be able to help me with ball park year its off of? If it is 80's, will it still work?
(I've attached pics of the rotor-hub-and id tag on the diff.)

 

The end I took pics of was the end that stuck outside the barn for about 7months, the rest is in good shape in and out. I was wondering a year for replacement parts. Also, my dana 30 has the 6 bolt warn premium hubs and this one has a 5 bolt plastic things, is there any way to swap them over?

 

You can swap out your 6 bolt hubs for the 5 bolt hubs on the disc setup. I believe the inner and outer bearings are the same. If they are not you'll need to use the inner bearing and cup from the disc brake hub. Compare the P/N's on the races (cups) to see if they're the same.

 

I don't want to rain on your parade but I don't think you can swap out the hubs. The spindles are not the same for drums and discs. The drum style has a step in it to match up with the larger inner diameter on the inner bearing. The hub won't work with the discs as the lug bolts come in from the back side to hold the discs in place.

 

Well, I hope that it'll work, I really like my hubs and the other ones are junk. I've got a few days off work coming up and I guess I'll find out the old fashon way. I don't know if it'll help but NAPA figured out that it was a 77 by the numbers one the rotors and bearings.

 

I do not think that you can keep your old hub housing. The drum brakes use a different size inner bearing than the disc hubs. If you find a earlier CJ with disc you will have better hubs. The best are 77 & 78 because a they used 6 bolt caliper bracket instead of the two bolt caliper bracket that has to attach to the knuckle. With a 6 bolt bracket you can keep your knuckles and you get a thicker rotor. Sorry to get off-track. The Hubs. If you ever find a jeep CJ rotor with better hubs, you can seperate the hub from the rotor if desired and use it.

 

Swap the spindles too if necessary. I used 6 bolt drum hubs for my disc conversion on a '73 D30. However, I did the Chevy bracket/disc setup using the 1 1/8" rotors. So, your results may vary. 4 Wheel Parts Hardware lists replacement 6 bolt hubs for '65 - '81 CJ Drum or Disc P/N 5358568H.
The only variation in the bearings that I am aware of is the width of the inner bearing cup. It is about 1/8" wider than the drum cup (race) The disc inner race is LM501311 I believe the drum inner race is LM501310.

 

Well, you're right. They are different. The axel shaft size and the bearing sizes are smaller. However the only differences with the outer side of the spindle is that it is slightly thinner to accomindate the rotors. My friend owns a auto machine shop and he fixed that problem. I'm going to pick them up today and see if it works. I think i'll get to keep my d30 and stronger hubs. I'll take pics if it works.

 

Try it with the old MC first. Some have good results that way. If not, find a Jeep MC that was set up for disc front/drum rear. They can be found new fairly cheap. Just make sure you use a non-power assist MC if yours isn't set up that way now.