Hello and welcome to Packard Motor Car Information! If you're new here, please register for a free account.  
Login
Username:

Password:

Remember me



Lost Password?

Register now!
FAQ's
Main Menu
Recent Forum Topics
Who is Online
123 user(s) are online (55 user(s) are browsing Forums)

Members: 2
Guests: 121

William Grosz, humanpotatohybrid, more...
Helping out...
PackardInfo is a free resource for Packard Owners that is completely supported by user donations. If you can help out, that would be great!

Donate via PayPal
Video Content
Visit PackardInfo.com YouTube Playlist

Donate via PayPal




Differential substitution options
#1
Home away from home
Home away from home

Wat_Tyler
See User information
Does anyone know off the tops of their heads (or where best to look) if a rear end from a 1954 Patrician would fit easily under a 1947 Super Clipper? Seems to me that the latter with its slush box probably has something in the region of 3.54:1 gearing versus the 4.10:1 or so likely found out back in the '47. Thoughts, comments, queries, observations.


Thank you in advance.

Posted on: 10/18 5:09
If you're not having fun, maybe it's your own damned fault.
 Top  Print   
 


Re: Differential substitution options
#2
Home away from home
Home away from home

53 Cavalier
See User information
I don't have any answers, but something else to think about is if the brakes are compatible.

Posted on: 10/18 9:27
 Top  Print   
 


Re: Differential substitution options
#3
Webmaster
Webmaster

BigKev
See User information
I know a 54 Senior complete rear axle has been swapped under a '37 120 to go from a 4.xx to 3:54. The bolt pattern was the same 5x5. Obviously, you would now have to use the '54 rear drums and rear brakes. Also, the axle spring perches may need to be moved (cut, moved, welded), and depending on any driveshaft to differential spacing differences and u-joints, the driveshaft may need to be altered to match.

This is my plan for my 37 115C, where an overdrive would be a hard fit due to its proximity to the frame x-member and its adaptation to the cane shift.

Posted on: 10/18 9:53
-BigKev


1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog

1937 Packard 115-C Convertible Coupe -> Registry | Project Blog
 Top  Print   
 


Re: Differential substitution options
#4
Home away from home
Home away from home

humanpotatohybrid
See User information
Looks pretty darn similar though the leaf spring attaching bracket is noticeably a little different and I don't know on dimensions.

packardinfo.com/xoops/html/modules/parts ... lateNumber=2842&partslist=1941-1947

packardinfo.com/xoops/html/modules/parts ... PlateNumber=112&partslist=1948-1954

Posted on: 10/18 10:44
1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog
1955 Clipper Super Panama | Registry
 Top  Print   
 


Re: Differential substitution options
#5
Home away from home
Home away from home

Wat_Tyler
See User information
Quote:

53 Cavalier wrote:
I don't have any answers, but something else to think about is if the brakes are compatible.



I thought about that. Briefly. Mix-n-match doesn't bother me.


Much.

Posted on: Today 13:53
If you're not having fun, maybe it's your own damned fault.
 Top  Print   
 


Re: Differential substitution options
#6
Home away from home
Home away from home

Wat_Tyler
See User information
Quote:

BigKev wrote:
I know a 54 Senior complete rear axle has been swapped under a '37 120 to go from a 4.xx to 3:54. The bolt pattern was the same 5x5. Obviously, you would now have to use the '54 rear drums and rear brakes. Also, the axle spring perches may need to be moved (cut, moved, welded), and depending on any driveshaft to differential spacing differences and u-joints, the driveshaft may need to be altered to match.

This is my plan for my 37 115C, where an overdrive would be a hard fit due to its proximity to the frame x-member and its adaptation to the cane shift.



Thanks for the thoughts. I'm kind of wondering between the 3.90 from a non-o/d unit and the '54 rear I have with the 3.54. All my big car axles are for o/d units, though, so I'd have to hunt one down somewhere, or at least the pumpkin contents.


I'm guessing that you're looking for a little axle with the 3.54 for yours, then. I have the axle in my '54 limo, too. I unload all those and my scrap guy will hate me when he comes for the rust.

Posted on: Today 13:57
If you're not having fun, maybe it's your own damned fault.
 Top  Print   
 


Re: Differential substitution options
#7
Home away from home
Home away from home

Wat_Tyler
See User information
Quote:

humanpotatohybrid wrote:
Looks pretty darn similar though the leaf spring attaching bracket is noticeably a little different and I don't know on dimensions.

packardinfo.com/xoops/html/modules/parts ... lateNumber=2842&partslist=1941-1947

packardinfo.com/xoops/html/modules/parts ... PlateNumber=112&partslist=1948-1954



I see that!!! Lovely! Thank you very much. Have you become the website scouring guru? I can find stuff, but Google finds it better for me.


I'm taking a welding class this fall, and a lot of those things - like changing attaching brackets - is all of a sudden a lot less intimidating. I'm thinking the big question might be the difference in overall lengths. It'll require a look-see. If the backing plates are the same and the brakes are different, I could put the '47s on the '54 axle. If they're different, I can cut-n-weld soo.


I need to shop for a welder.

Posted on: Today 14:01
If you're not having fun, maybe it's your own damned fault.
 Top  Print   
 








Search
Recent Photos
Photo of the Day
Recent Registry
Upcoming Events
46th Annual Texas Packard Meet
04/03/2025 - 04/06/2025
Packard Salon - Calling All Twelves
05/27/2025 - 05/29/2025
58th Annual National Meet
05/31/2025 - 06/06/2025
AACA Fall Meet (Hershey)
10/06/2025 - 10/10/2025
South Pacific Packard Club 2026 Rally
03/22/2026 - 03/28/2026
Website Comments or Questions?? Click Here Copyright 2006-2024, PackardInfo.com All Rights Reserved