Bebop
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Ford 9" same thing.
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Eaton HO72 Tech Thread
- Thread starter 06h3
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YotaAtieToo
Thick skull
9" was popular in the hotrod world before it ended production.
Either way, I agree, some aftermarket support would be nice for the Eaton. Despite them still being somewhat easy to find.
Tech Tim
Your AD Here....
Damn you guys, I'm now wanting to build a Eaton front with 05+ superduty outters.
Back in the day, Randy's was offering a 3.73 gearset for the H054/72s. I was asking Randy about it and he says they were supposedly going to be really hot sellers, then once he had them made, all the promised sales went poof and they slowly trickled out over time. Wasn't worth the business expense to have them made and then sit on the shelf for years before they finally sold out.
TurboYJ
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With the factory gears already being good choices for off-road, I don’t even see the need for much aftermarket support. Only thing I’d like to see are lockers but u can stuff a 14 bolt one in there so they prob figure what’s the point. It’d be nice if Eaton would continue to make the no slip w the right spline option tho, they still make them for the 14 bolt. Wouldn’t take much to make the same one in 17 spline still.
chaplinfj60
Well-known member
That right there is keeping from doing one. I do believe you can use 14 bolt axles or something. Lots of neat tips and trick but no aftermarket stinks.
TurboYJ
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See that just makes me want to do it more, I guess I just like doing things the hard way.
ridered3
Low Talent Wheelin
YotaAtieToo
Thick skull
This, not everyone wants to scour junk yards and beg online for the parts they want to run.
Iirc, there is also an odd bearing that is either hard to find or impossible.
gozuki
Webwheeler
Pinion bearing?
TurboYJ
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I don’t believed it’s hard to find, just expensive as in $250-300. But if ur willing to spend way more than that in new gears for another axle I don’t see why that would be a scary price tag. The bearings in mine seem fine, I’ll be running them after extensive cleaning as long as I don’t find any chunks missing. Nothing I’ve seen tearing into mine would prevent me from cleaning and reusing any of it yet, other than the drum brakes which will be raplaced w squarebody front breaks and a $50 bracket from Barnes to hand the calipers on.
TurboYJ
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Has anyone ever tried a lock right in one of these from a 14 bolt? They reuse the 14 bolt side gears or spider gear where the axles slide in. Whatever ud like to call that, I may give it a try if I can’t find a no spin. Only because I already have one that my friend didn’t end up using just sitting around.
arse_sidewards
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There's some sort of special sphereical roller. You can replace it with a conical roller but capacity is reduced.
Bebop
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I've bought $1500 ring and pinions for 10" center sections.
The price tag isn't the problem.
The sourcing is.
chaplinfj60
Well-known member
i love the unique side of it. i hate if something fails and i am 4 plus hours away from home it ends my trip. no chance of a parts store having anything random you may need. but boy do i love them
AlxJ64
Rust is Paint
Yes, that simple. I commented on that a few posts back when the 7-32 was pointed out. '53 is a good year as I bet it has the Hyatt Bearings in it.
The pinion bearings are either a double roller or a double taper and they were very hard to find for a while until an interchange was discovered with an offshore producer. They are still around $250 for the double taper version thats actually as mentioned later in this thread, a reduction in capacity because it is straight cut and not spherical.
The carrier bearings are of the same geometric grind as they ride in a nice bowl, so any sort of deflection is usually translated and there is a better load distribution during the load event vs high pointing a straight cut taper bearing.
You will need to drill out and ream the hubs to run longer studs to run the thicker face disc rotors. Theres a few different studs out there that you can use but I prefer to go with dually studs and run spacers on my rear axles to get them out to a wider width. The front Eaton I built has Ford D60 outer hardware and I built it to 69" WMS and the rear I am running is a '65 C30 housing that was was 65" WMS so I threw some 2" spacers on it. The DRW studs gave me a good amount of stud length.
It doesn't fit. I checked it out. The tooth profile and internal diameters are just different enough between the14 bolt and the Eatons. I tried it with the Aussie Locker brand and the Loc-rite (sp) brand as well, about 5 years ago at this point.
^ Yep, this is the case for both the pinion bearing, the carrier bearings, and the hub bearings. A LOT of the strength of these axles come from the spherical bearings that were utilized. Hyatt made the best ones if you can find them. There are modern taper interchange parts to replace all of these, based on dimension but they just aren't as tough as the original stuff.
And for some more information on these...
The third support bearings had 3 different sizes IIRC; depending on the year of the gearset the diameter of the pinion nose was a different diameter or length.
The gearset thickness is different between the HO52s and HO72s also and roller bearings and taper bearing snouts had different oiling ports machined into the thirds.
TurboYJ
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Alxj64, thanks for the info on the studs I would have just ran 14 bolts srw studs otherwise. Mine is the 65” flavor from the truck, def the older roller style bearing in there. I’m amazed at how tight the tolerances are in this thing. So far nothing seems unusable at this point. Thanks for letting me know the lock right won’t work before I go spending time messing around w it. I’m gonna stay on the search for a no slip, prob buy any of these a run into for parts in hopes a come across one that has one. If not I’ll go the 14 bolt locker route. I’m not in any hurry tho as I have other projects that pay ahead of this.Tons of useful info here tho, much much appreciated my man.
AlxJ64
Rust is Paint
To each their own. I have a few spares for my stuff as the parts were easy to find 10 to 15 years ago. I ran a basically stock one but with a shave and custom rear cover / disc brakes in a 5k lb TJ, 40" sticky Treps, Muncie 465, Klune V Goliath, Atlas 3.8, and the only problem I had with the Eaton ever was the axle shaft bolts just would not stay tight until I went to socket caps with the heads drilled for safety wire and I aircraft lock wired them in place.
Here is a pic of the two side gears together from when I was comparing. It was obvious even before cleaning them up and test fitting the carrier together.
One thing to keep in mind is your seal surfaces; I've found that a lot of these old things have grooves in the seal lip surfaces and often need a speedy sleeve to fix them up. If they're real bad, I'll machine them and press on my own speedy sleeve, but if they're not too bad, I'll just use the green loctite for sleeve retainers and use an out of the box sleeve.
Here is a pic dump of some of my last Eaton Projects.
Ohh, compared to a Dana 60 pinion yoke on left. And the double taper aftermarket straight cut bearing disassembled.
AlxJ64
Rust is Paint
And a few more
Lining up the seal web plates before welding in for the front build.
Seal puck backside for front
Seal side of sealing pucks.
Lining up the seal web plates before welding in for the front build.
Seal puck backside for front
Seal side of sealing pucks.
ridered3
Low Talent Wheelin
I have called around in the past for pinion bearings. They were a day out from orielly if I remember correctly. I didn’t need them, I was just curious.
I have enough 3rds I threw a set of pinion bearings in the rig in I ever needed them. Wheel bearings and carrier bearings are easy to source and sometimes stocking items.
With that said, I can confidently say these pinon bearings are stout. I changed out the wheel bearings and carrier bearings but left the pinion bearings. I have about 30k miles on my axle now (and who knows how many hundreds of thousands before me) and they have never been an issue. I have that axle up to 90 mph. Set it on cruise at 75-80 mph for 8-12 hours in 100*+ heat. On UA 2017 we did highway miles in 125* heat, no issues. I have done the same in sub freezing temps. I have driven it all over the west without issue (CA, AZ, UT, ID, NV, OR.) I also have driven it all over the north east on UA. I think highway miles will kill the pinon bearings before off road use will and I have throughly tested it.
My buddy has 2 KOHs on his Eaton HO72. He’s in the 4500 class. I’m gonna tear into hopefully in the next 3-4 months. He thinks his pinon bearings are shot but I don’t think they are from what he’s described, I think it went back together with like .040 backlash. Still running fine.
I wish I could have some damn 5.86s for my Eaton! I have a custom D70 front that would love 5.8X gears.,
I have enough 3rds I threw a set of pinion bearings in the rig in I ever needed them. Wheel bearings and carrier bearings are easy to source and sometimes stocking items.
With that said, I can confidently say these pinon bearings are stout. I changed out the wheel bearings and carrier bearings but left the pinion bearings. I have about 30k miles on my axle now (and who knows how many hundreds of thousands before me) and they have never been an issue. I have that axle up to 90 mph. Set it on cruise at 75-80 mph for 8-12 hours in 100*+ heat. On UA 2017 we did highway miles in 125* heat, no issues. I have done the same in sub freezing temps. I have driven it all over the west without issue (CA, AZ, UT, ID, NV, OR.) I also have driven it all over the north east on UA. I think highway miles will kill the pinon bearings before off road use will and I have throughly tested it.
My buddy has 2 KOHs on his Eaton HO72. He’s in the 4500 class. I’m gonna tear into hopefully in the next 3-4 months. He thinks his pinon bearings are shot but I don’t think they are from what he’s described, I think it went back together with like .040 backlash. Still running fine.
I wish I could have some damn 5.86s for my Eaton! I have a custom D70 front that would love 5.8X gears.,
AlxJ64
Rust is Paint
I've kept track of the temp on my rear as well with some long hauls in the Carryall at 70 to 75 mph, and it never got above 140 degrees and zero noise or metal on the magnet I added to the plug. The killer of the pinon bearings is either oil starvation, or excessive rust pitting from sitting and then a sudden burst of highspeed and load. The sign of a bad pinion bearing on these is usually VERY notable lateral yoke movements, and I'm talking driveshaft vibrations and clunking. What is common on these is that the retainer flange needs to be snugged up or the yoke itself is loose on the pinion which gives the hand feel that the bearings are bad. I've been gifted two that were "going bad" and they were totally fine. One is in my Ex Wife's TJ and has 50k miles on it after the install.
Those are just H110 Yokes, the next size up axle in these series. They were found in the CCKWs, M135s and M211s. Some had flange yokes as well and I can't remember which ones.
TurboYJ
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Eaton ho 52,72 New Yoke. 1410 u joint | eBay
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U sure this isn’t an ho72? I have no way of telling as I haven’t even taken the one off mine yet lol it’s not flanged like ours that’s for sure
Aisin
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Dana S110 has a 12.25” ring gear. Way bigger than a 14 bolt.
YotaAtieToo
Thick skull
I was talking over all housing size. Put that 3rd into a fab9 style housing and I'd bet it would be damn close to a stock 14b housing, if not better.
AlxJ64
Rust is Paint
Eaton ho 52,72 New Yoke. 1410 u joint | eBay
Find many great new & used options and get the best deals for Eaton ho 52,72 New Yoke. 1410 u joint at the best online prices at eBay! Free shipping for many products!www.ebay.com
U sure this isn’t an ho72? I have no way of telling as I haven’t even taken the one off mine yet lol it’s not flanged like ours that’s for sure
It will FIT an HO72 and an HO52, but it came OFF of the H110s. The pinion shanks are all the same. The bearing ODs were bigger and the H110s have a 6 bolt retainer vs the HO52 and 72 have the 5 bolt, but the yokes are the same spline and diameters. Even the seal surface is the same diameter.
Doubleud
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Dude, if you'd just sit back and soak in some of the tech being thrown at you rather than throwing off on everything that isnt a cookie cutter tube chassis, LS, 14 bolt rig, maybe you'd learn a thing or two.