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Old 04-15-2016, 12:24 PM   #126
kurk4fun
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Re: Eaton HO72 rear brake drums

Thanks guys for your replies to my questions about conversion from drum brakes to a disc and rotor brake setup. I am at my end. I have a bad rear drum that I need a replacement. My 1972 dually and a friend of mine are both in need. Does anyone know of a new axle setup that would be the correct width for our trucks. Or a course for a new brake drums.
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Old 04-15-2016, 03:42 PM   #127
Dieselwrencher
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

Great thread! I have a HO52 that has no center section if anyone is lookign for brake parts. I can check the condition of them. It is just under a Longhorn frame right now to allow it to move around. I'm getting a 72 K20 soon, and I plan to do the 13" 14bff brake swap to it.
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
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Old 10-03-2016, 09:43 PM   #128
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

edited, please use the classified area for ads.
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Old 01-11-2017, 11:10 PM   #129
rustyburbin
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

Quote:
Originally Posted by chewiebarker View Post
Sorry for the ignorance, and for reviving an old thread, but if people use the heavy duty rear ends like Eaton HO52 with 4.56 gears for hot rods or drag racers, and they use transmissions like TH350s, why the heck is my 71 K20 Suburban so slow? Is it just that the 350 engine can't spin the gears fast enough? Is it just the weight? If I put a 500hp engine in it, will it then 'go fast' with little other modification? (Not that I would. I am just trying to learn how it all works together.) Thanks for any insight! - Marc
I have a 70 K20 suburban with an ho52, 4.10 gears and 35 inch coopers. I put in a ZZ4 350 (approximately 340HP at the crank) and have the th350 trans (4l80 coming this summer!) My truck scoots around pretty dang good for its size and weight. In fact I can beat up lifted ford's with the 7.3 (I know, I know the 7.3 is a bit of a dog) but still, I spank their butts!

I don't how this helps if at all... maybe just a grounds of comparison?
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Old 01-11-2017, 11:52 PM   #130
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

Running a 4.56/31" Michelins in a 1968 C30 (3/4 ton) 8' stepside which weighs 4500 empty and, for what it is, performance is on par. While on the subject of the H052's does anyone have a gear whine noise problem with it. I have a very loud whine in mine. I have put 30K on it and it has never gotten any worse and never caused any other problem. Just would like to know if there was any fix for it.
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Old 01-12-2017, 12:26 AM   #131
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

I would check for amount of backlash in ring gear to pinion gear .
If ok Lucas Oil Treatment does Miracles.
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Old 01-12-2017, 09:18 AM   #132
trivejb
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

Had the Lucas oil treatment recommended and on my list as soon as the weather allows. Will try that first. Can someone point me to how to check and adjust the backlash. Sounds a little complicated and something I have not done.
Thanks
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Old 01-12-2017, 11:59 AM   #133
rustyburbin
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

I recently did mine. You'll need a dial indicator and regular set of wrenches. You can do it without pulling out the third member but it's probably better too, I did mine on the work bench. Either way you'll need to pull your axels and disconnect your drive shaft. Here's a short video that explains the basics... https://youtu.be/Ouq67Fyt5K8

Your HO52/72 doesn't have shims it has threaded bearing adjusters (that's not what they're called) which make it supper easy to work on but be sure not to loosen one side or the other to much while adjusting the backlash because you can loose your bearing preload... set up your dial indicator like on the video and if you need to tighten the you'll need to loosen the bearing adjuster on the passenger side first about a 1/4 turn and tighten the drivers side the same amount, check the dial and repeat as necessary. It's really not that hard. Oh yeah, loosen the bearing caps a little bit so things move freely. And don't forget to move the deflection pin in a little bit too. That's the little "bolt" with the jamb nut that's on the side of the case closer to the pinion, you see it when you get into the diff, it has a brass end that rides against the back side of the ring gear.
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Old 01-12-2017, 02:51 PM   #134
trivejb
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

Thanks for the video and very complete description for setting the backlash. Does not sound bad and I do have a dial indicator so will tackle it soon. Will try and find an exploded view of the Eaton to determine what the " threaded bearing adjusters" are.
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Old 01-17-2017, 10:43 PM   #135
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Re: Eaton HO72/HO52 vs. 14 Bolt FF

I put the late model 2500hd brakes on my ho72 I work at a machine shop and have a program written water jet them out I will try to get pictures tomorrow.
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