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Rearend #1079533 Fri Jan 16 2015 01:02 PM
Joined: Aug 2008
Posts: 304
S
Slick69 Offline OP
Shop Shark
I have a 1948 1 ton GMC dually which is very slow going down the road. It looks like an eaton rearend, What years can I go to to get a high geared pumpkin to swap out with. Thanks

Re: Rearend [Re: Slick69] #1079535 Fri Jan 16 2015 01:26 PM
Joined: Jul 2007
Posts: 67
G
GMCJoe Offline
Wrench Fetcher
Slick69, I've converted two GMC 1-tons from the 5.14 to 4.10. I refer you to the following site for a thorough "how to": oldGMCtrucks.com, on the homepage select "Technical Stuff", then select "3/4 Ton Rear End Swap" located in the middle column near the top. Pretty simple job with a 20% gain.


Joe

1947 Second Series GMC 1-Ton Longbed
In the Stovebolt Gallery
More pix in the Bolt Bucket
Re: Rearend [Re: Slick69] #1079611 Fri Jan 16 2015 08:03 PM
Joined: Nov 2008
Posts: 556
A
aggie jon Offline
Shop Shark
Simple, if you can find the rear end. Look for a 68-72 Chevy 3/4 ton with factory 350/auto. And there behind you will find a 4.10 rear end.

Re: Rearend [Re: Slick69] #1079633 Fri Jan 16 2015 09:16 PM
Joined: May 2005
Posts: 9,144
G
Grigg Offline
.
Still worth checking the ratio prior to purchase, it may or may not still have 4.10 gears.


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: Rearend [Re: Grigg] #1082834 Sat Jan 31 2015 11:20 PM
Joined: Oct 2014
Posts: 7
V
vermont48 Offline
New Guy
I have a 48 3800 and I found a 4.10 ring and pinion from a Suburban but it does not have the entire carrier assembly. Can anyone tell me if on of these eaton HO52 gear sets will fit (bolt into) into my factory carrier or do I need an entire 67-72 carrier?
Thank you

Re: Rearend [Re: Slick69] #1082943 Sun Feb 01 2015 07:25 AM
Joined: Jul 2014
Posts: 168
1
1Ton_tommy Offline
Shop Shark
I think the issue is the ratio. I believe 4.56 and 5.13 used a different carrier than the 4.10 and higher. Of course, the earlier ones only had the lower ratios. Since the pinion on the low geared ones is smaller, either the ring gear must be thicker or the carrier mounting flange must be closer to the pinion. A visual check should tell you if you have everything apart and can compare.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Rearend [Re: 1Ton_tommy] #1082952 Sun Feb 01 2015 12:25 PM
Joined: Oct 2014
Posts: 7
V
vermont48 Offline
New Guy
1Ton_tommy
Thank you, much appreciated

Re: Rearend [Re: Slick69] #1084494 Mon Feb 09 2015 01:09 AM
Joined: Aug 2008
Posts: 304
S
Slick69 Offline OP
Shop Shark
Thanks guys. That website helped. Where can one check for the #'s that are stamped on the rear end pumpkin? I have a couple here but without pulling them not sure what the gear ratio is. HG816 & U303 are the #'s of each pumpkin. Thanks again for all the help

Last edited by Slick69; Mon Feb 09 2015 01:10 AM.
Re: Rearend [Re: Slick69] #1085057 Wed Feb 11 2015 06:30 PM
Joined: Nov 1995
Posts: 4,326
J
John Milliman Offline
Founder/Developer
Slick,

Be sure to check *this* site's Tech Tips, too. We have one for this that's pretty comprehensive and has a lot of photos with it. If the link doesn't work, let us know -- we've been having some issues.

It really is a simple upgrade.


John

'49 Chevrolet 3804

Re: Rearend [Re: Slick69] #1086013 Mon Feb 16 2015 06:43 PM
Joined: Aug 2008
Posts: 304
S
Slick69 Offline OP
Shop Shark
Thanks, John

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