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Rear End Swap for a 1954 Chevy 1 Ton Panel Truck (3805)
#1407342 Sun Apr 25 2021 12:17 AM
Joined: Oct 2019
Posts: 12
5
'Bolter
I have seen a few threads about swapping rear ends for a Chevy 3600, but I did not see any about the 1 ton (38xx) swaps. I could really use some ideas here. I need to swap the rear end out of my 1954 Chevy 1 Ton Panel Truck (3805) as the old Eaton rear end is in serious disrepair... not to mention that I do not have many gearing options available if I stick with the Eaton. This truck is being retrofitted with later components (such as upgrading the engine to a 454, upgrading the tranny to possibly a 4T80, and quite few other serious modifications). The 454 will be carbureted with a higher compression ratio than stock, a high torque cam, and a few other goodies. The bottom line is that this engine and tranny combo will produce some power. I need a rear end that can handle that power.

One thought might be to get an 80's C30 or equivalent 1 ton rear end. I would be fine with that; I just am not sure about whether or not I should modify (shorten) the rear end to the width of the original Eaton rear end. As I understand it, the later rear ends are something like six inches total (three inches each side) wider. I need to confirm.

Some important notes: I want to keep the 8 x 6.5 Lug pattern. This is a single (not a dually) rear end. The truck is also a two wheel (rear - as if I needed to say this) drive. I am considering tire sizes between P275/65R18 and LT235/85R16 - I am fairly open. Once I get this info, I will determine the gear ratio I want and purchase the gears that fit my needs. Oh, and I like Dana 70s --> anybody have ideas on Dana 70s? Also, disc brakes... I am wanting a rear end with disc brakes. You get bonus point for helping me find a rear end with disc brakes :-).

If modification (narrowing) is highly recommended, then who can I find to perform such a modification? Anybody know of someone who does this in the Houston, Texas or Conroe, Texas?

I am going to create a new thread regarding swapping out the front end as well. I wanted to try to keep this separate.

Thank you. I am looking forward to your thoughts. Many many thanks!

Re: Rear End Swap for a 1954 Chevy 1 Ton Panel Truck (3805)
54paneltrucker #1407345 Sun Apr 25 2021 12:41 AM
Joined: Sep 2020
Posts: 23
H
'Bolter
so why not look into Currie Enterprises, they build rear ends to spec, bolt pattern/ 1t bearings/ etc etc. Prices are less than you would expect...quality is there too
have their work in my 46.


Hank: 46 Chev 1/2ton shortbed
2018 Miata RF
Re: Rear End Swap for a 1954 Chevy 1 Ton Panel Truck (3805)
Hanks custodian #1407348 Sun Apr 25 2021 12:44 AM
Joined: Oct 2019
Posts: 12
5
'Bolter
ccanepa50 - Thanks for that! I will check them out!

Last edited by 54paneltrucker; Sun Apr 25 2021 12:47 AM.
Re: Rear End Swap for a 1954 Chevy 1 Ton Panel Truck (3805)
54paneltrucker #1407350 Sun Apr 25 2021 02:11 AM
Joined: Apr 2016
Posts: 127
A
ASU Offline
'Bolter
54 panel,

Check out the tons o' fun page. At the top there is a posted message about 36xx and 38xx axle swaps. lots of good info, mostly pertaining to trucks, but I 'm sure the panel info would be much similar. you have to be picky, but a current 14 bolt corporate axle will fit, and get you the disc brakes.

https://www.stovebolt.com/ubbthread.../14-bolt-axle-swap-info.html#Post1249600

good luck
Jon

Re: Rear End Swap for a 1954 Chevy 1 Ton Panel Truck (3805)
54paneltrucker #1407362 Sun Apr 25 2021 03:00 AM
Joined: Jun 2011
Posts: 4,233
E
'Bolter
Dana 70 and 80’s come in single and dual rears, pickup and CC, which have different widths, disc brakes, ratios up to 3.54, should be able to find something to work for your needs. 80’s come with 10 on 7.25” so be careful.

I used to live by the blimp hangar.

Ed

Last edited by EdPruss; Sun Apr 25 2021 03:01 AM.

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

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