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1948 3/4 ton rear axle bolts #1318457 Fri Jul 19 2019 10:24 PM
Joined: Feb 2019
Posts: 46
J
Joel1948 Offline OP
Wrench Fetcher

I am re-visiting this project after 10 years off and can't find the 8 axle bolts that hold each axle in place. The axle holes have a slight counter sunk hole. I can't find these available. My question is, would it cause problems if I use some high grade off the shelf bolts with square corners under the head? The only problem I can imagine is there might be a rotational slippage. The holes measure .525 and the top of the counter sink is .660. That .025+ difference between the hole and a 1/2" bolt bothers me. Anybody have some they want to sell? Any ideas?

From a tech tip here at Stovebolt, I'm pretty sure the axels are Eaton axles used in 3/4-ton trucks from 1947 - 1972. I likely have a HO52 center section https://www.stovebolt.com/techtips/axles/1%20Ton%20Upgrade/

Attached Files
axle end.jpg (183.53 KB, 137 downloads)
Re: 1948 3/4 ton rear axle bolts [Re: Joel1948] #1318511 Sat Jul 20 2019 10:18 AM
Joined: Dec 2014
Posts: 361
S
SavannahDog Offline
Shop Shark
Don't remember the size off hand. If you went to a hardware store and bought 1/2, 9/16, and 5/8 bolts. And figured out the correct one. Then measure the hole depth. Now you can go to https://www.mcmaster.com/ and get the right bolts.


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Re: 1948 3/4 ton rear axle bolts [Re: Joel1948] #1318887 Tue Jul 23 2019 12:35 AM
Joined: May 2005
Posts: 9,134
G
Grigg Offline
.
Pretty sure they’re 1/2-13 threadfor the original Eaton axle. My 51 had normal bolts and lock washers, likely original. I suspect that can be confirmed with the parts manual if you want to look.
http://chevy.oldcarmanualproject.com/1929_57chevyparts/index.htm

Newer 14 bolt rear (has a lot of similarities) uses a flanged head bolt with serrations under the flange to resist coming loose. Those could be sourced and used on the older Eaton if you wanted.

Some (other brand/model) axles use studs and cone wedges with nuts and washers. Kind of looks like that’s what you have. What’s the axle from?


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 1948 3/4 ton rear axle bolts [Re: Joel1948] #1318922 Tue Jul 23 2019 02:43 AM
Joined: Apr 2005
Posts: 2,311
C
coilover Offline
Shop Shark
Do a search for tapered cone for big truck axle bolts and you will get a lot of hits.


Evan
Re: 1948 3/4 ton rear axle bolts [Re: Grigg] #1319925 Wed Jul 31 2019 04:09 AM
Joined: Feb 2019
Posts: 46
J
Joel1948 Offline OP
Wrench Fetcher
Hi Greg. Yes they are 1/2-13. I had to chase the holes a day ago. definitely 1/2-13. I got some bolts that will work from Paul (triplep) off a 60 3/4 ton. I'm just concerned about the clearance allowing the axle to rotate a little bit. The bolts are .495 and the hole is .530 if I remember right. The cone would center each bolt like wheel bolts do.
I don't know how I ended up with two threads but, I'll attach the same photo's I did on the other thread.

Attached Files
Truck rear end 1.jpg (173.81 KB, 69 downloads)
Truck rear end 2.jpg (165.91 KB, 70 downloads)
Truck rear end 3.jpg (163.65 KB, 70 downloads)
Truck rear end 4.jpg (183.53 KB, 69 downloads)
Re: 1948 3/4 ton rear axle bolts [Re: Joel1948] #1327574 Tue Sep 24 2019 10:12 PM
Joined: Feb 2019
Posts: 46
J
Joel1948 Offline OP
Wrench Fetcher
When installing the other axle, I found these cones in 2 of the holes.
Did these axles come with cones in all the holes? Did the hubs have Studs ? I might be looking for the wrong parts.

Attached Files
20190907_154601.jpg (157.08 KB, 56 downloads)
Re: 1948 3/4 ton rear axle bolts [Re: Joel1948] #1327628 Wed Sep 25 2019 03:29 AM
Joined: May 2005
Posts: 9,134
G
Grigg Offline
.
If it fits those cones then you need them, and usually cones go with with studs and not bolts.

You haven't answered what the axle is from, but I haven't noticed an original 48-53 Eaton with cones in the axle flanges. perhaps they did in later years, I don't know.

In any case, it doesn't really matter what the axle is from or why it has those cones when they are not expected... you either use them as intended or swap axle shafts for the plain ones with straight holes and bolts, but that's unnecessary if what you have works.


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 1948 3/4 ton rear axle bolts [Re: Joel1948] #1327667 Wed Sep 25 2019 01:07 PM
Joined: Jul 2007
Posts: 498
'
'54 3600 Offline
Shop Shark
Joel1948 ,

Do your rear axle hubs look like this ?

PIC

https://i.postimg.cc/FzYtkwL8/IMG-4453.jpg


George
'54 3600


1954 3600

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