Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

Will the G80 locker from a 14 bolt fit in the eaton carrier? They are both 2 piece carriers, just not sure what is on the internals of both of them

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

No...The 14-bolt G80 carrier is a unit unto itself. In other words, you cant put a True Trac or Detroit locker in a 14-bolt with the G80 carrier because it uses a 3 pin design instead of a 4 pin like the standard open carrier...I don't know what the specs are for the HO72 carrier but I doubt the 10.5 ff 14-bolt carrier would swap as a whole unit.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

Heres some good info... http://67-72chevytrucks.com/vboard/s...=536119&page=2 Rather than swapping a G80, why not look for a 14-bolt that has the Detroit Locker in it and just use the locker unit. I believe the Detroit Locker was the only traction device used in the Eaton HO72 & HO52...

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I have seen several of the Eaton HO52/72's with Detroit Lockers in them. My '66 C20 has one. You might be able to find one from an Eaton.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

It should be mentioned that if you want to put a 14 bolt FF rear in the 72' & older leaf spring truck with out modifying spring perches,it has to be from a one ton.3/4 ton perches are in the wrong location

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

Here is a YouTube video comparing the HO52 / HO72 carriers of a 4.10 and 5.14 ring gear:
https://www.youtube.com/watch?v=Ol5f...ature=youtu.be
Looks like GM used the same carrier and just thinned out the ring gear.

Here is some discussion of the ring gears:
https://www.youtube.com/watch?v=QCXq...ature=youtu.be

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

Jeremy , are you still interested in pictures of a 3.90 gear set from a HO 72 ,
I have it out and on the ground.
Now I'll just have to learn how to post a picture .

John

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

Last time jbclassix logged in was 06-02-2019

I would be interested in seeing pictures.








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Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I also would be interested please. I have the EATON in my 72 k2500. I am looking to upgrade it where I can, if I can. Thank you.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

https://johngobby.smugmug.com/My-Fir...DL/i-ckmkZ7c/A

https://johngobby.smugmug.com/My-Fir...DL/i-5nsdCLN/A

https://johngobby.smugmug.com/My-Fir...DL/i-SmGK2gr/A

https://johngobby.smugmug.com/My-Fir...DL/i-9JvSC7V/A

https://johngobby.smugmug.com/My-Fir...DL/i-DjxhJh5/A

Hope you can see the HO72 stamped in crown gear as well 39 x 10 gears
the CO stamp I suspect it refers to a corporate designation . Also hope the pictures turn out , I had to wait for my 7 year old grandson to drop by to help me post the pictures . JOHN

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

Thanks.:metal:









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Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

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Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

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Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

You have a Very Rare part:metal::chevy:









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Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I suspect the reason for the shortage of 3.90 's was lack of demand as at 60 mph
on 30 in tires there's only a little over 100 rpm difference , hardly worth the effort .

John

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

John,
Just curious here, is there a GM part number on the ring gear and the nose of of the pinion gear that you can take a pic of?
Lmk thx

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I also have a 5.38 ratio here , but its in a housing buried in my parts shed
so cant get pictures for now .

John

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I didn't see any but will check again and get back to you if I find some .

John

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I suspect that you may have a gear set that was made by aftermarket company some time ago to fit into the Eaton 3rds.
Or it could be a GM Canada thing, whereby there were definitely differences in production and equipment.
Having a GM part numbers would clear up any confusion on being original or aftermarket.
Thanks

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I'm confused.

I have a SRW H072 in my C3500, So do I just get the backing plates from a 14bolt ff and the drums, then take my hub/drum, separate them, put the new drum and my old Eaton Hub together, swap out backing plates and brake parts, and re assemble?


I am confused if I reuse my Eaton hubs, or if I have to do some kind of magic to make the 14 bolt hubs fit my Eaton spindle......

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

From my understanding you are good to go on the SRW axle. I am geared up to try the swap myself in the near future. My donor axle has slip on drums though. Fingers crossed and good luck.

On a side note. Alot of dual rear trucks came from the factory as SRW and are dealer converted to duals. There is an actual RPO code for it. I have one of these trucks in my yard right now but the SPID is missing.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

To make sure I have this straight, either bore out the Pre-70 hubs to accept the bigger 9/16 14 Bolt studs, or use longer 1/2 Pre-70 studs? Was there any issues running the smaller studs with the 14 bolt drums? Does the clamping force of the wheel being torqued down hold the drum in place and not slide fore or aft depending on the direction the wheels are turning upon applying the brakes?

I have the backing plates, just need to get the drums, shoes, hardware kit, and lug studs. In my research I swore I read in a thread on this subject that 14 Bolt hubs were required, and that with some creative interchanging of inner bearings and races, that the 14 bolt hubs would work. I then re-read this thread exclusively, as I cannot find the other threads I previously found on the subject, and discovered 14 bolt hubs only work with some machining to accept the Eaton inner bearing race. I did buy some 14 bolt hubs, but will most likely use the Eaton hubs for my swap to 14 bolt brakes.

Any information you guys can provide on the subject that I am missing will be much appreciated.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I bored a set of hubs out with a good drill. The metal was actually pretty soft. Then I installed the larger lugs. It was all pretty easy. I haven't run them yet. That will be part of my upcoming swap. I want to set up a rear to be able to run duals but be switchable back to SRW eventually. I need a K30 for a few months.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

That sounds easy enough. Did you use a drill press? I don't have one, but may be able to use someone else's. I'd hate to have lug studs all crooked:lol:

This is all going in the '65 C20 in my avatar. I discovered in my parts truck's HO52, that it housed a 4.11 3rd member. I went to move the sometimes daily driven truck the other day to remove the radiator for it to be cleaned and sealed, when my clutch decided to act up. I have been wanting to swap in my SM420 and Ranger OD, but have been enjoying the current setup in the truck. Well, if I have to remove the transmission to work on the clutch, a trans swap is in order, along with an upgrade to the HO52. I swapped in front disc in November 2015, so the braking is much improved, but now for a few more upgrades, and more modern 13 inch brakes will be a nice addition.

Re: Eaton HO72/HO52 vs. 14 Bolt FF
 

I used my cordless drill after my good drill finally died. I did chuck them in a vice though. It went quick and they came out straight. I mounted the rims with no problem. I did this with a DRW rear but I am going to decide which axle to put under the K20.