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Expert
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Location: ZH, Switzerland | Powerflite - 2014-08-14 7:06 PM
If the width is important, get a '68-'70 B-Body rear. That is the closest to the '56 and is a little wider than the '65-'67 B-Body rear. I put one of them under my '56 Plymouth.
One thing though. You will want to cut your original spring perches off and weld them to the new axle because the springs are splay mounted (at an angle). If you attempt to use newer spring perches, they are too wide to work well with the splayed springs. Your lower shock mount is also located on the perches so this will enable you to keep the shock in the stock location and reuse your original U-bolt plates.
Thank you very much. I just did a little bit of investigation about the track (drum to drum with the backspacing of the wheels). Personally I don't know how much the back spacing of the wheels changed over the years. Except of the Dart (A-Body) and Imperial (D-Body) all b and c bodies were using a 5 x 4.5" bolt pattern.
For my theoretical view I assume the back spacing was constant.
The track width of 65-70 B-Body cars was 58.5 inch (1480 mm). For the 65 to 68 C-Bodies (and E-Bodys - original Challenger and Barracuda) the rear track width was 60.6 inch (1540 mm).
Over the years the rear track width increased from 55/56. My 56 Chrysler has a rear track of 59.6 inch (1515 mm). Every new model year got few parts of an inch until the inntroduction of the C-Body cars.
I hope a 65 to 69 rear end of a C-Body (300, Newport, New Yorker, Ddoge Monaco, Dodge Polara, Plymouth Fury) would fit.
I didn't measure the space between the wheel (tire) and the fender. The C-Body track is about one inch wider. But the width of the 56 New Yorker and C-Body cars was always above 78.7 inch (2000 mm).
I was really surprised about how much parts Rockauto offers for the 65 to 74 8 3/4 rear end. They provide bunches of carries as well as different yokes (1330, 7260 and 7290). I would like to stick with a 742 carrier.
Source: http://www.zwischengas.ch/
Thank you very much!
Dieter
Edited by di_ch_NY56 2014-08-16 4:49 AM
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Expert
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Location: NorCal | di_ch_NY56 - 2014-08-16 1:45 AM
For my theoretical view I assume the back spacing was constant.
I wouldn't make that assumption. Notice the difference in the true rear end widths posted earlier and the track info...if the back spacing was constant, the track would change with the rear end width.
I consider the track dimension to be useless info unless the offset/back spacing info is known. |
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Expert
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Location: ZH, Switzerland | 57chizler - 2014-08-15 10:52 PM
di_ch_NY56 - 2014-08-16 1:45 AM
For my theoretical view I assume the back spacing was constant.
I wouldn't make that assumption. Notice the difference in the true rear end widths posted earlier and the track info...if the back spacing was constant, the track would change with the rear end width.
I consider the track dimension to be useless info unless the offset/back spacing info is known.
Yes I know, that's the reason I wrote this preamble.
Today I drove around 60 miles with my New Yorker. Now I hear the pinion bearings - at least. This sound is present since I'm owning the New Yorker. Long time I misinterpreted the sound as the sound of the tires.
Happy Motoring!
Dieter
BTW: this is the axle in question
Edited by di_ch_NY56 2014-08-17 11:41 AM
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Board Moderator & Exner Expert 10K+
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Location: Southern Sweden - Sturkö island | Before changing the rear axle, I'd demount it and check first Dieter. Hypothetically, if the pinion bearings are shot, you should be able to change them without having to re-align the pinion. That is, of course if the bearing races and the conical bearings has the same height measure. |
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Expert
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Location: ZH, Switzerland | Hello Sven
Thank you very much. I'm thinking about the issue many times. So I decided to remove both rear shafts and the differential carrier this fall. Further steps I'll decide when I'll see the condition of the pinion and the ring gear. If both are in a good condition I'll go to buy new bearings all around (plus axle shaft seals as well). Perfect would be if I would find shims to adjust the pinion pretension (with new bearings - of course).
The axle is almost identical to a '57 8 3/4 rear axle - but not exactly. Some bearings are the same as the threaded adjusters at the differential bearings. Rockauto claims that the differential gasket would be the same... the length of the drive shaft is 31 5/8 (as the '57 and '58).
To measure the drum-drum distance, the flange-flange distance and the spring (perch) distance I need an assistant person. Few weeks ago I got a laser distance measurement tool as a present for my birthday.
Happy Motoring!
Dieter |
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Location: So. Cal | di_ch_NY56 - 2014-08-19 10:03 AM
...The axle is almost identical to a '57 8 3/4 rear axle - but not exactly. Some bearings are the same as the threaded adjusters at the differential bearings. Rockauto claims that the differential gasket would be the same... the length of the drive shaft is 31 5/8 (as the '57 and '58)....
Dieter
Yep, that's why I suggested that you at least try to see if a later gear set would mate up to your axle. I've never tried it and it would be good information to know if it works. |
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Location: ZH, Switzerland | Powerflite - 2014-08-18 10:46 PM
di_ch_NY56 - 2014-08-19 10:03 AM
...The axle is almost identical to a '57 8 3/4 rear axle - but not exactly. Some bearings are the same as the threaded adjusters at the differential bearings. Rockauto claims that the differential gasket would be the same... the length of the drive shaft is 31 5/8 (as the '57 and '58)....
Dieter
Yep, that's why I suggested that you at least try to see if a later gear set would mate up to your axle. I've never tried it and it would be good information to know if it works.
For the C-72 (New Yorker) there were most parts two year only (55/56). A little different is the story for the C-71 (Windsor w/o power pack). But the differntial carrier itself is - according the parts book not exactly the same. But the shim at the end of the axle (flange) was used from 55 to 58. So I assume the brake shield would fit from 55 to at least 58.
Happy Motoring!
Dieter
Edited by di_ch_NY56 2014-08-20 2:33 PM
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8 3/4 ?
