The Stovebolt Site Forums The Shop Area Driveline 3800 brake compatibility

I recently scored a 4.57 third-member from a wrecking yard out of a 69 3/4 ton. That means it has Bendix brakes on an Eaton HO52 axle.

Does anyone know if the brake assembly from said axle will fit on an HO72 that now has Huck brakes? I'd go take some measurements but the yard it 40 miles away. My 14 inch drums are OK but not by much. There are no replacements for the Huck drums, new or used that I've been able to find. I believe that Bendix drums are available.

Not sure on the brake question. But someone will chime in shortly for ya. I did want to mention tho. If the third came out of a 69 ¾ton truck with a v8 and auto trans, it may be a 4.11.

No 4:10. I counted the teeth before I bought it. I can't pull a 4:10 loaded in overdrive. 4.57 times the .83 overdrive gives me about 3.90. So I can pull my big trailer in direct-drive on flat ground or my camper in overdrive.

I'm no expert here but there was a previous discussion and it may be of some value.
https://www.stovebolt.com/ubbthread...56665/re-3600-rear-axle.html#Post1456665

tommy, good options!

Ed

First off, weren't all 52 and newer trucks equipped with Bendix style brakes?

2nd, are you using the complete 69 rearend or just the center section?

Anyhow, I know many of the 67-72 guys use the drums and brake assembly from 14 bolt rearends. I can't give the specifics, but I'm sure there is fabrication involved.

The early trucks had hat style drums, whereas the later ones were pressed on from the rear.

I've played around with HO52 and 14 bolt wheel hubs. They are interchangeable with the appropriate bearings.

Some of the 80's vans had hat style drums, and they weren't as deep as the 14 bolt drums. It may be possible to use something from a van as long as you get the backing plates and misc. Components.

Regardless of what you do, there is going to be some level of fabrication involved.

I looked into that a while back. 1/2 tons converted to Bendix brakes for '51, but the larger trucks had Huck brakes a bit later than that. In '52, 3/4 tons and bigger still had Huck brakes. Can't really tell on '53 models as the page is barely readable in the Vehicle Info Kit (I think the same as in '54). In '54 Bendix were used across the board, except for rear brakes on 4000 and larger trucks.

1-tons, I know went to Bendix brakes in 52 or 53. There were lots of those axles around stirpped of their brakes years ago. People put then on the earlier trucks. I brought one home thinking it was valuable in about '74. It was still sitting on the property when I sold the lot.

I know the 14-bolt drums are held on by the studs being pressed through them. I didn't know the late HO52s were that way. That makes them a lot harder to work on. I suppose I could get the hubs, backing plates and the whole shebang of the axle and swap it to mine if that would work. I think Greg did some threads on that now that I think about it. I'll look.

Another downside to retaining the HO52 or 72 aside from Huck brakes if that's what you have, is that there are virtually no pinion bearings available. It's a unique bearing with two cones facing each other in a double-sided cup. The last one I saw for sale was for several hundred dollars and that was NOS.