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Rear End Conversion
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   Forward Look Technical Discussions -> Transmission and Rear AxleMessage format
 
1956RoyalLancer
Posted 2018-10-25 4:14 PM (#572354)
Subject: Rear End Conversion


Member

Posts: 7

Location: Port Washington, New York (Long Island(

Hello,

I am looking to replace the rear end in my 1956 Dodge Royal Lancer. I have done a little research and in measuring the flange to flange distance using a mopar rear axle spotters guide I discovered that a 1962-1970 8 3/4 rear end would fit my car perfectly with a little adjustment to the spring purchases. Does anyonw know somewhere where I could find one of these for cheap? I am only 16 trying to build this car using my own money so spending over $1,000 on a new rear end is something I would love to avoid.

I will attach the spotters guide incase anyone needs it.

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CrAzYMoPaRGuY
Posted 2018-10-25 4:35 PM (#572355 - in reply to #572354)
Subject: Re: Rear End Conversion


Regular

Posts: 90
252525
Location: Locked in my Canadian garage....
That's not an incredibly accurate chart. 1966/67 B body rear is narrower than a 1968-70 B body rear. If you need exact measurements it's best to measure, or get a more accurate chart.
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1956RoyalLancer
Posted 2018-10-25 4:50 PM (#572356 - in reply to #572355)
Subject: Re: Rear End Conversion


Member

Posts: 7

Location: Port Washington, New York (Long Island(
Do you have a more accurate chart I could use?
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Powerflite
Posted 2018-10-25 10:20 PM (#572375 - in reply to #572354)
Subject: Re: Rear End Conversion



Expert

Posts: 4813
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Location: So. California
I made one up that is much better and includes a lot more info on it, but I would have to dig it up. The bottom line is that a '65-'67 B-body axle is the best swap for you. '68-'70 B-body will work too, but just a little wider. Cut off your old perches and weld them to the new axle at 41" separation. The old perches are really narrow, and you need them like that to fit your springs well. Although '62-'64 B-body is the right width, you probably don't want to deal with the older brakes and tapered hubs on them.

But your question about getting a replacement axle is completely pointless without knowing where you live. That's why we put our location on our ID so we don't have to ask you where you are. The shipping cost for these would negate any benefit of getting it cheaper. The best place to get them is your local Craigslist or automotive swapmeet.
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Powerflite
Posted 2018-10-25 10:23 PM (#572377 - in reply to #572354)
Subject: Re: Rear End Conversion



Expert

Posts: 4813
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Location: So. California
I made a little write up on it in the thread on my car. You can see it here. Look at the 10th picture down the page.

http://www.forwardlook.net/forums/forums/thread-view.asp?tid=57904&...
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57chizler
Posted 2018-10-26 2:02 PM (#572411 - in reply to #572355)
Subject: Re: Rear End Conversion



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Posts: 3058
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Location: NorCal
CrAzYMoPaRGuY - 2018-10-25 1:35 PM

That's not an incredibly accurate chart.


That's an understatement, that chart should be banned from the WWW. The info in this link is much more accurate:

http://www.moparts.org/Tech/Archive/axle/16.html
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GaryS
Posted 2018-10-26 4:03 PM (#572424 - in reply to #572354)
Subject: Re: Rear End Conversion



Elite Veteran

Posts: 1024
1000
Location: Ponder, TX
I installed a '70 B-body rear end in my '56 Plymouth and I had to move both spring perches about 3/8" for a perfect fit. They were fairly common when I was looking for one a few years ago, and I paid $75 for a good one about thirty miles from my house.
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Powerflite
Posted 2018-10-26 6:07 PM (#572431 - in reply to #572424)
Subject: Re: Rear End Conversion



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Posts: 4813
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Location: So. California
3/8" is the wrong number. It should have been 1.5" each side or 3" total. This is a picture of mine with the new mounts being welded in place, and part of the old mounts still there.



(56PlymRear.jpg)



Attachments
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Attachments 56PlymRear.jpg (130KB - 21 downloads)
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57chizler
Posted 2018-10-27 12:40 PM (#572475 - in reply to #572431)
Subject: Re: Rear End Conversion



Expert

Posts: 3058
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Location: NorCal
Hmmm. The '70 B-body spring centers are 44", the '56 FL are 41" so, yes, 3 inches difference.

Edited by 57chizler 2018-10-27 12:42 PM
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GaryS
Posted 2018-10-27 1:25 PM (#572479 - in reply to #572354)
Subject: Re: Rear End Conversion



Elite Veteran

Posts: 1024
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Location: Ponder, TX
Interesting! Then mine had to be something other than a 70, though the seller said it was. Before I bought it, I measured the pads and total width on my '56 and asked him to measure his before I made the trip. That was a few years ago, so I don't recall what the numbers were, but I brought both rear ends to the local welder and he relocated the mounts. When I dropped the body in place, the mounts were within 1/8" of perfect, and when I look at the old weld spots, they are slightly more than 1/4" from the original B-body welds.

I guess I don't know the answer, but it fits great.
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57chizler
Posted 2018-10-27 2:08 PM (#572485 - in reply to #572479)
Subject: Re: Rear End Conversion



Expert

Posts: 3058
200010002525
Location: NorCal
When measuring the spring centers with the rear end removed, the springs can relax either inboard or outboard so the measured centers aren't the true centers. What makes the '55-'56 unique is the "splayed" spring installation. IOW, the spring centers are wider at the front than the rear.



(splay.jpg)



Attachments
----------------
Attachments splay.jpg (27KB - 21 downloads)
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Powerflite
Posted 2018-10-27 2:12 PM (#572486 - in reply to #572354)
Subject: Re: Rear End Conversion



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Posts: 4813
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Location: So. California
Other way around John. They are wider at the rear.
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57chizler
Posted 2018-10-28 12:53 PM (#572511 - in reply to #572486)
Subject: Re: Rear End Conversion



Expert

Posts: 3058
200010002525
Location: NorCal
Yeah, dyslexia kicking in again.
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