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Replacement rear axle
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   Forward Look Technical Discussions -> Transmission and Rear AxleMessage format
 
LostDeere59
Posted 2018-08-09 2:20 PM (#568132)
Subject: Replacement rear axle



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Location: Hilltown, PA
So I've looked around in the archives and it seems that the best replacement rear axle to get rid of the tapered axles, and get updated brakes with integrated parking brakes is the 70-72 E-body cars.

Before I go searching for one I thought I'd see if there are any opinions good/bad on the E-body 8 3/4, or any suggestions on a "better" replacement.

Thanks for any input

Gregg
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59 in Calif
Posted 2018-08-09 6:07 PM (#568152 - in reply to #568132)
Subject: Re: Replacement rear axle


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Posts: 1073
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Location: Hayward, Calif
I got a complete rear axel ass'y drum to drum from a 68 Ply Fury and put in a 59 Dodge. It was a really close match but had a Fab shop move the spring mounts about 3/8" to perfectly align up to springs. It has an 8 3/4 diff. The slight difference in overall length did not create tire sidewall clearance issues to the inside fender well. This also gave me 2 1/2" X 11" brake shoes that are easily purchased at Napa. I also got the front brakes off a 63 Chry. The spindle , brakes, drum everything , ball to ball joint. 57 - 64 (if I remember correctly) Dodge, Desoto Chry all use the same ball joint. upper and lower. I now have 11" X 3" brake shoes in the front and still uses 4 1/2 X 5 lug nut pattern. If you are putting this on a 60 Desoto, it'll fit. You didn't mention what your working on. Jerry
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Powerflite
Posted 2018-08-10 6:02 AM (#568177 - in reply to #568132)
Subject: Re: Replacement rear axle



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Location: So. California
Yes, '65-'69 C-body axles are ideal. But often, if you purchase an E-body rear from someone, you are really getting one of these because they are so interchangeable. It is hard to tell them apart, but the E-body rear is supposed to have a different pinion angle, which is not as ideal for our cars. The perch distance on our cars is 45.5", and these newer rears have them at 46". This is close enough that you don't need to move the perches as the springs will easily move to accommodate the difference.

Keep in mind that this info is for '57-up. It is better to use a B-body axle on '55-'56 Dodge/Plymouth, and the '65-'67 fits a little better than the '68-'70 version.

Edited by Powerflite 2018-08-10 6:07 AM
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Mopar1
Posted 2018-08-10 12:30 PM (#568195 - in reply to #568177)
Subject: Re: Replacement rear axle



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"'65-'69 C-body axles are ideal" They bolt into many years of Mopars. A buddy bolted one in to his '41 Plymouth.
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57chizler
Posted 2018-08-10 12:38 PM (#568196 - in reply to #568132)
Subject: RE: Replacement rear axle



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The E-body rear end has the same overall width and spring centers as the more desirable C-body but the E-body has the wrong pinion angle. This can be corrected with a 3° shim under the rear of the spring pad to tilt the nose down.
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Powerflite
Posted 2018-08-13 12:23 AM (#568335 - in reply to #568132)
Subject: Re: Replacement rear axle



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Tilt it down by how much? What thickness of shim?
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57chizler
Posted 2018-08-13 12:49 PM (#568365 - in reply to #568335)
Subject: Re: Replacement rear axle



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Location: NorCal
Tilt in down 3° with a tapered shim.

https://www.summitracing.com/parts/bel-4976/overview/
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Powerflite
Posted 2018-08-13 1:11 PM (#568368 - in reply to #568132)
Subject: Re: Replacement rear axle



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Got it. Sorry my eyes are getting worse on me. I thought your original post said 3" as to the width. I guess I should start wearing some reading glasses.
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CrAzYMoPaRGuY
Posted 2018-09-23 4:40 PM (#570635 - in reply to #568132)
Subject: RE: Replacement rear axle


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Location: Locked in my Canadian garage....
65-67 C body rears (and E body) are one inch wider overall, and spring perches close enough to use as is. Spring gets pulled in 1/4" each side to sit under perch.

65-67 C body rear is 61.75" wide drum to drum
E body rear is 61.625" wide drum to drum

65-67 C body and E body 46" spring perch to spring perch.

Supposed to be slightly different pinion angles C to E body, but without measuring who knows. Conflicting measurements and data everywhere on the internet.
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60 dart
Posted 2018-09-23 6:38 PM (#570640 - in reply to #568132)
Subject: Re: Replacement rear axle



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3 degrees might work for some but not all and would be guessing at best . if one goes through the work of changing a rear unit , wouldn't it make sense
to go the other 50 feet of that mile and degree gauge the process -------------------------------------------------later
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57chizler
Posted 2018-09-24 10:56 AM (#570684 - in reply to #570635)
Subject: RE: Replacement rear axle



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CrAzYMoPaRGuY - 2018-09-23 1:40 PM

65-67 C body rear is 61.75" wide drum to drum
E body rear is 61.625" wide drum to drum


The '65-'69 C-body is the exact same width as the E-body, even use the same axle shaft. The only difference, as previously cited, is the pinion angle.

One other difference is the location of the housing vent which alters the location of the brake line distribution block; this requires a different brake hose.
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mikes2nd
Posted 2018-10-16 10:22 PM (#571832 - in reply to #568132)
Subject: Re: Replacement rear axle


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I am hunting down Jeep Dana 35's in the pull a part.... I can get posi with parking brake and disc brakes for 150$ Same width. offset is 3/4 inch.

Looks like the ratio is 3.55 which will work.

65 mph is 3000 rpm, obviously high but no OD.

The other Dana 35 ratio is 3.07, that's 2660 rpm... better

they have newer axles I am looking at a 2006 Durango, it has a 3.4 ratio, posi and all kinds of stuff, have to cut the perches off. Have to worry about the disc brakes a bit on the new stuff

i used this calculator. tires are 26.6 tall
http://www.differentials.com/technical-help-2/differential-gear-rat...



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mikes2nd
Posted 2018-10-17 12:55 PM (#571862 - in reply to #568132)
Subject: Re: Replacement rear axle


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Hmm so if a Dana 44 fits I can maybe find one of those... coming out of the same car? they should fit the same, ill check the length, offset looks the same 3/4

 

They are more sought after...

 

axle ratio is too hight a 3.73. though, a complete axle is 200$ at lqk



Edited by mikes2nd 2018-10-17 12:58 PM




(Dana44s.jpg)



Attachments
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Attachments Dana44s.jpg (96KB - 1 downloads)
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