ChryCorp Passenger Car Rear Axle Dimensions and ID: 1962 to 1989

[mtandrews]

Sources:

• Information courtesy of Chrysler Performance Upgrades (CarTech) by Frank Adkins. Updated for the F/J/M-body and R-body platform cars by Farley's Library
• Transcribing of CarTech chart data courtesy of www.440magnum-network.com
• The Standard Catalog of Chrysler - 1914-2000 - Edited by James T. Lenzke
• www.Car-Part.com

Charts:

• Axle Dimensions Illustration courtesy of Chrysler Performance Upgrades (CarTech) by Frank Adkins.
• Mopar Rear Axle Spotter's Guide (contributor unknown). Updated with notes on the 10-bolt 7.25" rear axle, the 10-bolt 8 1/4" axle and the 12-bolt 9 1/4" axle by Farley's Library

Below is a chart and diagram showing rear axle dimensions for Chrysler, Plymouth, and Dodge passenger cars manufactured from 1962 to 1989. Body lines covered are A-Body, B-Body, C-Body, E-Body, F-Body, J-body, M-body and R-body. Also attached is a chart showing the various types of rear axles used by Chrysler for the same period.

(A) = Flange to Flange.
(B) = Leaf Spring Centerline to Leaf Spring Centerline..
(C) = Centerline of Axle Shaft to Centerline of Rear Universal Joint

View attachment ChryCo diff ID.jpg

View attachment ChryCo diff sizes.jpg



Year Axle Type (A) (B) (C)
1963 - 1972 7 1/4" A-Body 53.200" 43.02" 10.09"
1973 - 1976 7 1/4" A-Body 51.400" 43.02" 10.09"
All 7 1/4" F/J/M-Body 54.340" 44.46" 10.09"
1973 - 1976 8 1/4" A-Body 51.400" 43.02" 11.69"
All 8 1/4" B/R-Body 57.800" 47.30" 11.69"
All 8 1/4" C-Body 59.200" 47.30" 11.69"
All 8 1/4" F/J/M-Body 54.340" 44.46" 11.69"
All 8 3/4" A-Body 51.400" 43.00" 12.35"
1962 - 1970 8 3/4" B-Body 55.000" 44.00" 12.35"
1971 - 1974 8 3/4" B-Body 57.800" 47.30" 12.35"
1971 - 1974 8 3/4" B-Body S.W. 59.200" 47.30" 12.35"
All 8 3/4" E-Body 56.500" 46.00" 12.35"
All 9 1/4" B/R-Body 57.800" 47.30" 11.69"
All 9 1/4" C-Body 59.200" 47.30" 11.69"
1966 - 1970 9 3/4" B-Body 54.936" 44.00" 13.47"
All 9 3/4" E-Body 56.500" 46.00" 13.47"

 

[4spdragtop]

Good info, I seen another post similar to this and I think the dimension #'s are off, but someone will chime in here to verify.

 

[DionR]

Flange to flange (or drum to drum) numbers are way off. A-Body 8.75" axles are 57 1/8", F-Body 8.25" axles are 59 1/2".

Looks like another list of track width numbers.

The other numbers look accurate, though.

This seems to be the most accurate list I have found, so far.

 

[crackedback]

That listing needs to go in the garbage. ol Frank did some pretty crappy research. A hollander manual could have been used, but, I guess not!

A 8.75 flange to flange are 52 5/8. Where that 51.40 number comes from is beyond me.

62-70 B rears ARE NOT the same length for those years.

That moparts link is the best for 8.75 rears.

 

[mtandrews]

thanks for informing me guys. A bud sent me this and I just figured I'd transfer it here but if it's shite then we/I need to dump it. Is any of this info "salvageable"?

EDIT: where can the rear info be found for the F,M,J, and R cars?

 

[mtandrews]

not being a bonehead but DionR sez 57 1/8 flange to flange and CB sez 52 5/8 for the same diff... ????? I don't want a Dust Up, just trying to get real numbers. I'll discard the ones I have from Adkins as all here says his numbers are skewed.

 

[DionR]

Both numbers are accurate, just to different points.

Mine (57 1/8") is from out of axle flange to axle flange, with drums. Or, inside to inside of wheel mounting surface.

Crackbacked's number (52 5/8") is housing flange to housing flange, and is also correct.