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Unread 10-09-2015, 07:35 PM   #1
mamllc
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Join Date: Sep 2015
Location: Sturgeon Bay, Wisconsin
Posts: 69
Front axle ID help

I have a 76 CJ5 with front drum brakes. I just bought a disc brake axle that the seller said was from a 76. I pulled the front cover and the date on the ring gear is 8/21/78. At the very least I want to start with new calipers, pads, and rotors. I was pricing parts at Rock Auto and they list different brake parts for 76, and 79, are the brake parts different, and how do I know what year axle I have?

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Unread 10-09-2015, 07:58 PM   #2
mamllc
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Looks like I get to add another hub socket to the collection too.
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Unread 10-09-2015, 08:33 PM   #3
skizriz
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1978 CJ7 
 
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Location: Scottdale, Pa
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Here's what you will need to know when shopping for brakes, calipers, and rotors for that axle.
In mid 1978 they changed the setup. I had two 78 axles, and one had one setup, and the other had the other.

One setup is refered to as a "2 bolt calipers", "small brakes", and I've heard parts store clerks refer to them as "later brakes". They were used in the mid 78 and newer.
The bracket the caliper bolts on to looks like this.

The brake pads look like this. Flat across the bottom.

The rotors are thinner at something like 7/8" wide.

Mid 78 and older used what is refered to as "6 bolt calipers", "big brakes", and "earlier brakes".
The mounting bracket looks like this.

And the pads look like this, curved at the bottom. They are not interchangeable with the others.

And the rotors are thicker at 1 1/8" thick (IIRC).

They also use a different MC for each setup, and the rear brakes are something like 11"x2" for the older six bolt caliper brakes, compared to 10"x1.75" rear brakes for the newer 2 bolt caliper brakes. (those rear brake drum sizes are off the top of my head, and may not be exactly correct, but close).
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78 CJ7.. 258.. TH400/Dana18.. SOA/stock YJ springs.. 35" General Grabbers.. Waggy 44s.. 4.88 gears...Spartan/Lockright...Fiberglass front to rear
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Unread 10-09-2015, 09:31 PM   #4
mamllc
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Location: Sturgeon Bay, Wisconsin
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Thanks, that clears everything up. Definitely not a 76 axle, has two bolt calipers. I didn't much care for the prices on the earlier parts, the later stuff is much cheaper.
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Unread 10-10-2015, 04:00 AM   #5
skizriz
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1978 CJ7 
 
Join Date: Jun 2011
Location: Scottdale, Pa
Posts: 4,768
Seems like the later parts were easier to get at the local stores also.
The benefit of the earlier years is the size. On paper it doesn't see like much, but seeing the rears side by side with the smaller later years, the difference is huge.
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78 CJ7.. 258.. TH400/Dana18.. SOA/stock YJ springs.. 35" General Grabbers.. Waggy 44s.. 4.88 gears...Spartan/Lockright...Fiberglass front to rear
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