oldasdirt Posted February 26, 2016 Report Share Posted February 26, 2016 (edited) I have spent several hours looking through threads of changing rear ends, and ratios being listed for newer rear ends. I also see on the truck forum there are a few great threads listing the various years and rear end ratios available for various years and models of trucks. I can not seem to find on the forum or on the internet anywhere that has the various rear end ratios for the Mopar Car Family. Those being Plymouth, Chrysler, Dodge & Desoto. Does anyone know of any such resource ? If there isn't I thought I would start a thread to attempt to cover them. I do know in 1957 when Mopar introduced the 8 3/4" rear end the breath of ratios ballooned. and you could get from 2:76 to 5:57 in 12 different ratios and those are covered nicely on this site. http://bionicdodge.com/Download/Mopar_8_3_4_Rear_End_Guide.PDF However I was thinking of trying to put together the resource for the pre-1957 rear end ratios. I have a few manuals so I will attempt to list those and I am hoping others with chime in. Edited February 26, 2016 by oldasdirt 1 Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted February 26, 2016 Report Share Posted February 26, 2016 I do know that my 39 Desoto has the 4.11 rear and this was a factory rear that is still in the car. Rich HArtung Quote Link to comment Share on other sites More sharing options...
oldasdirt Posted February 26, 2016 Author Report Share Posted February 26, 2016 1941 Plymouth - taken from the Detroit - Chrysler Corporation Plymouth Passenger cars part list 3:73 (economy) 664941 3:91 (coupes) 664687 4:1 (all sedans utility and delivery sedans and Suburban) 664392 4:1 (passenger coupe) 664392 4:3 (export & convertible coupe) 664688 4:56 (special ratio) 695539 4:78 (export, limo - 18" wheels) 664689 4:89 (limo) 664604 Quote Link to comment Share on other sites More sharing options...
oldasdirt Posted February 26, 2016 Author Report Share Posted February 26, 2016 1953-54 - Chrysler Corporation Parts list c56, c58, c59, c60 d43, d44 , d46, d47, d48, d49, d50, d51, d52, d53 s16, s18, s19, s19, s20 p24, p25 3:36 s16 1483887, with t.c 1485078 3:54 overdrive p24-d43 1489174, 1489229, s18 c60 1489229, 1404482, 1330696, 1330696 3:73 overdrive 1489175, s20 c62 1489250, s16 1405926. 1330710 3:9 overdrive 148189, exc t.c 1480189, 1489223 3:91 8 sedan 1330710 4:10 export sp24-25 1489177. 8 sed. 1330718 4:3 8 sed. 1339728 4:3 special p24-d43 1489178 Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted February 27, 2016 Report Share Posted February 27, 2016 1939 Desoto Differential Information 4.1 to 1 All except 7 pass sedan and limo wo overdrive 663442 4.3 to 1 all except 7 pass, sedan and limo with overdrive 663456 4.3 to 7 pass. sedan and limo wo overdrive 666880 4.56 to 1 7 -pass sedan and limo with overdrive 697311 4.78 to 1 Export to La Paz Bolivia all except 7 pass sedan and limo 663649 4.89 to 1 Export to La Paz Bolivia 7 pass sedan and limo 670577 Rich Hartung found this in my 39 Desoto Parts book Desoto1939@aol.com Quote Link to comment Share on other sites More sharing options...
knuckleharley Posted February 27, 2016 Report Share Posted February 27, 2016 I do know that my 39 Desoto has the 4.11 rear and this was a factory rear that is still in the car. Rich HArtung My 42 Dodge coupe came stock from the factory with a 4:11 rear or a 4:4something rear. I did manage to find a buy a NOS 3:73 ring and pinion for it,though. I'm guessing the 3:73 option was popular in the flat mid-west where there were lots of miles between gas stations. Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted February 27, 2016 Report Share Posted February 27, 2016 My 42 Dodge coupe came stock from the factory with a 4:11 rear or a 4:4something rear. I did manage to find a buy a NOS 3:73 ring and pinion for it,though. I'm guessing the 3:73 option was popular in the flat mid-west where there were lots of miles between gas stations. A D-22 bizzy coupe actually came with 3.73 to 1 according to the manual. with or without fd. all sedans with fd....3.9 to 1 without fd.....4.1 to 1. club coupe with fd or without 3.9 to 1. vert with fd 3.9 to 1 without fd...4.1 to 1 7-passenger sedan with or without fd 4.3 to 1. If you guys change your gear sets you must also put the correct speedo gear in the tranny to read correctly. 1 Quote Link to comment Share on other sites More sharing options...
knuckleharley Posted February 27, 2016 Report Share Posted February 27, 2016 A D-22 bizzy coupe actually came with 3.73 to 1 according to the manual. with or without fd. all sedans with fd....3.9 to 1 without fd.....4.1 to 1. club coupe with fd or without 3.9 to 1. vert with fd 3.9 to 1 without fd...4.1 to 1 7-passenger sedan with or without fd 4.3 to 1. If you guys change your gear sets you must also put the correct speedo gear in the tranny to read correctly. Thanks for the updates. Mine is a business coupe with fluid drive,and when I started researching this stuff after buying the car a few years ago,I was told or read all the 42's came with either 4.1 or 4.3 rear. Otherwise I never would have spent the big bucks for a 3:73 ring and pinion. I guess the good news is I can always sell it to someone else if it won't work in my 33 Dodge sedan. Does anyone know if rear parts in the 33 and 42 are interchangeable? Quote Link to comment Share on other sites More sharing options...
austinsailor Posted February 27, 2016 Report Share Posted February 27, 2016 From my "MOPAR 1954 and prior year Passenger csr parts list" Apr 1, 1955, (1946 - 1954) this list of differential applications. If the resolution isn't good enough, message me and I'll email you a higher resolution version. One page on this post, second on next. Too big for both on one post. 2 Quote Link to comment Share on other sites More sharing options...
austinsailor Posted February 27, 2016 Report Share Posted February 27, 2016 page 2 of diff list, 1946 - 1954. 2 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.