Bigblue50
Newbie
Posts: 7
Reg: 06-21-23
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05-13-24 02:42 PM - Post#2869806
I would like to swap out my original differential with a more modern unit which will allow me to cruise at highway speeds. I’ve read that plug and play units are available to accomplish this. Obviously, I would prefer being economical and find a unit at a local salvage yard. Can somebody give me a list of vehicles that would be compatible with my 1950 Chevy 3600 original read end?
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Keroppi
Poster
Posts: 85
Loc: NorCal
Reg: 10-24-18
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06-12-24 08:05 PM - Post#2870818
In response to Bigblue50
I can't figure out how to quote your message, but suffice to say you'll probably need a '54 or newer rear axle if you want to get rid of the torque tube, which is not compatible with much.
You're going to need the open driveshaft also.
I don't know about the width of the 3600, since it's a big truck, and I have a '46 3100. I used a '55 rear axle.
Do you have a 261 inline 6 in your 3600?
Alan
"Keroppi" - 1946 Chevy 1/2 Ton Pickup
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Bigblue50
Newbie
Posts: 7
Reg: 06-21-23
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07-30-24 03:14 PM - Post#2872227
In response to Keroppi
No, I have a SB Chevy 307, factory HO52 Eaton rear end with 4.57 gearing. No driveshaft yet. I’ve spent hours gleaning, sorting thru information and believe only a 4.10 differential will work to allow me to keep the original axel housing. No Eaton axel was ever made with 4.11 gearing. No companies make an after market 4.11 ring and pinion. Apparently certain C-20, K-20 and C-30 Chevy truck models from 1968-1972 with Eaton HO52 rear ends and 4.10 gears will allow for a direct differential carrier swap out. Oh, 3.90 gears are too tall for my housing also. Does anyone concur or disagree with this info?
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 Gunk
"17th Year" Silver Supporting Member
Posts: 410
Loc: Phoenix
Reg: 04-08-08
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08-15-24 02:27 AM - Post#2872725
In response to Bigblue50
This is correct from the research I've done. Here's a link: https://www.stovebolt.com/techtips/axles/1%20To n%2...
I sourced one and am about to do the swap. Tough to find these
Gunk
'57 Four Door B/A Sedan w/283
'48 3604 Thriftmaster
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Edited by Gunk on 08-15-24 02:28 AM. Reason for edit: No reason given.
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Keroppi
Poster
Posts: 85
Loc: NorCal
Reg: 10-24-18
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09-16-24 12:45 PM - Post#2873922
In response to Bigblue50
No, I have a SB Chevy 307, factory HO52 Eaton rear end with 4.57 gearing. No driveshaft yet. I’ve spent hours gleaning, sorting thru information and believe only a 4.10 differential will work to allow me to keep the original axel housing. No Eaton axel was ever made with 4.11 gearing. No companies make an after market 4.11 ring and pinion. Apparently certain C-20, K-20 and C-30 Chevy truck models from 1968-1972 with Eaton HO52 rear ends and 4.10 gears will allow for a direct differential carrier swap out. Oh, 3.90 gears are too tall for my housing also. Does anyone concur or disagree with this info?
Ok, I figured out how to quote your post...I don't come around here too often, so please forgive me for the slow reply.
You can replace the ring/pinion in the axle you have. You should have a torque tube, it's not compatible with any of the aftermarket stuff, but you could put a 3.55:1 ring/pinion combo in that,
Here's a page that shows how it's done.
http://devestechnet.com/Home/DifferentialOver haul
Another forum that discusses it.
https://www.stovebolt.com/ubbthreads/ubbthreads .ph...
Finally, here's one from Chevs of the 40s. They sell the ring/pinion gears, but I got mine from Joe Mendoza at Mother Trucker in Arizona. He hangs out of the HAMB and Stovebolt, AFAIK, but not here. Keeping the torque tube you can go to 3.55:1 and using a '54 or newer that had 3.90:1 will be able to upgrade to a 3.38:1. The axles are not compatible, so you can't interchange them.
https://www.motortrend.com/how-to/1003clt-chevs- of...
Here's the gears that will fit your truck:
https://www.chevsofthe40s.com/detail/12151/Chevrol...
Alan
"Keroppi" - 1946 Chevy 1/2 Ton Pickup
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Bigblue50
Newbie
Posts: 7
Reg: 06-21-23
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11-16-24 10:52 AM - Post#2875632
In response to Keroppi
Thank you so much for the info guys! Greatly appreciate it
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Bigblue50
Newbie
Posts: 7
Reg: 06-21-23
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11-16-24 11:07 AM - Post#2875633
In response to Gunk
Hey Gunk have you completed your swap yet? How’d it go? Thanks for your post. I was just wondering if you had anything else to add to the swap that maybe the video didn’t discuss, thanks again
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