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ehostler
02-09-2003, 12:30 PM
All numbers in this chart are based off of information provided by John Kunkle.

The illustration is by Andrew Elliot (AJMOPAR)

cuda66273
02-11-2003, 11:21 AM
Ed
Can you check with john and see if he minds if i use this image on my website?
Thanks
Don
bigdaddy@4secondsflat.com

ehostler
02-11-2003, 06:15 PM
The axle image and page format are basic copies of the old axle dimensions diagrams that have been floating around. I just entered the correct data provided by John. I did put a MOPARCHAT watermark on it, so people would know where it came from, as it begins to go around the internet.

I don't have a problem with you putting it up on your site. The board is the only way that I have of contacting John. I would say to go ahead and post it. If John doesn't want you too, I'm sure that he'll speak up.

George G. Leverette
02-26-2003, 01:08 PM
A good use of the chart would be to find the cars with dimensions under column (A) that exceeds 57xx. These axles can be shortened to A-body widths for the 8 3\4 rear ends and have the big bolt pattern.

NC PUTZER
03-07-2003, 09:03 AM
ED HOSTLER
I REALLY APPRECIATED SEEING YOUR REAR AXLE DIMENSION CHART.

DO YOU HAVE ANY INFO. ON THE OUTSIDE HUB TO HUB DIMENSIONS AT THE WHEEL MOUNTING SURFACE ???

I NEED TO REPLACE THE REAR END ON MY 1947 CHRYSLER NEW YORKER CLUB COUPE BECAUSE THE MOTOR IS NOW A 440 AND THE TRANS. IS A 727. THE HUB TO HUB DIMENSION THAT I NEED IS APPROX. 62 1/4 " THE 440, 727 & REAR END CAME FROM A 1977 NEW YORKER, BUT THE 1977 REAR END HAS A 65 3/8 " HUB TO HUB DIMENSION.

WHAT WOULD BE A GOOD REAR END TO USE BEHIND THE 440 & 727 ?????????

I DID POST A PHOTO OF THIS FINE OLD MOPAR WHEN I WAS LOOKING FOR A CENTER DUMP EXHAUST MANIFOLD, BUT HERE IS WHAT IT LOOKS LIKE. NOT MANY CLUB COUPES LEFT OUT THERE.

ANY SUGGESTIONS WILL BE GREATLY APPRECIATED

JOE D. (NC PUTZER)

NC PUTZER
03-12-2003, 07:35 AM
TO:>>>>> GEOGRE G. LEVERETTE

IN YOUR POST ON THE "REAR AXLE DIMENSION CHART BY E. HOSTLER" YOUR MENTIONED REAR ENDS WITH A " BIG BOLT PATTERN. WHAT BOLT PATTERN ARE YOU REFERING TO????

I WOULD LIKE TO KNOW IF THE 8 3/4 FROM A 1965-1969 C-BODY WOULD HAVE A 5 X 4 1/2 BOLT PATTERN AXLE. ALSO, WOULD THE GEAR CASE FROM ANY 57.xxx " WIDE FLANGE ALXE FIT INTO THE ALXLE HOUSING FROM A 1965-1969 C-BODY????

THANKS FOR PREVIOUS INFO.

JOE DENEEN ( NC PUTZER )

NC PUTZER
03-12-2003, 08:30 PM
TO:>>>>>>>> ED HOSTLER

THANKS TO YOUR REAR AXLE DIMENSION CHART AND SOME SUGGESTIONS FROM JOHN KUNKLE, I HAVE SELECTED SEVERAL
8 3/4 REAR ENDS FOR THE 1947 CHRYSLER NEW YORKER CLUB COUPE.

I WOULD LIKE TO KNOW THE FORMULA FOR DETERMINING THE RATIO OF THE GEARS BY TURNING THE DRIVESHAFT AND IF ONE OF THESE REAR ENDS WITH A 2.76 TAG WOULD BE O.K. BEHIND A 440 W\ 727, TO BE USED ONLY FOR CRUSING.

THANKS AGAIN,
JOE DENEEN ( NC PUTZER )

ehostler
03-12-2003, 09:59 PM
If it is an open rear, immobilize one tire. Now mark the yoke and the other tire. Begin turning the other tire and count how many times the yoke turn for one complete turn of the tire. That is your gear ratio.

If it is an SG rear, make sure that both wheels are free to turn. Mark one of the wheels and the yoke. Begin turning one of the wheels. Again, count how many times the yoke turns for one complete turn of the wheel.

You can run a 2.76 with a 440, but it will be a dog. I currently have a 2.76 open rear behind my 440 and that poor 440 has a hard time getting just one tire to break traction with those gears. The thing is a dog off of the line. Once you are up to about 45, the engine comes alive.

George G. Leverette
03-13-2003, 02:08 AM
NC Putzer all mopars had the big bolt pattern except the A-bodies before 1973. Full size cars manufactured after 1973 including the A-bodies had the large bolt pattern. All of the 8 3\4 rear ends (pumpkins) are interchangeable. Forget the argument about pinion sizes and their strength, the ring gear teeth are the weak link and will fail before any other part of the rear in in all but exceptional cases. The axles will fit except for length, Moser engineering on the east coast and Sutton engineering on the west coast can shorten these axles correctly and have some longevity.

NC PUTZER
03-13-2003, 09:20 AM
THANKS TO ED & JOHN

ED: WHAT ARE THE NEXT GEARS THAT I SHOULD LOOK FOR TO GIVE THE 47 CHRY. JUST A LITTLE MORE GET UP & GO FROM A STOPPED POSITION. THE 440 HAS JUST A LITTLE BIT OF CAM THAT WILL GIVE ME SOME LOW RPM TORQUE.

JOE DENEEN ( NC PUTZER )

ehostler
03-13-2003, 10:06 PM
I think that the 3.23 gears would be closer to what you are wanting. They give decent mileage with a little better low end grunt.

NC PUTZER
03-14-2003, 08:24 AM
Ed:

Thanks for your reply to my question regarding gears for the 8 3/4

You mentioned the SG rear end. From some of your previous posts I assume that SG means "SURE GRIP"

Could you please compare the "SG" to the " OPEN " rear end as far as identification and performance.

Joe Deneen ( NC PUTZER )

ehostler
03-15-2003, 01:11 PM
An open rear will only put the power to one wheel. A Sure Grip rear will apply the power to both wheels.

Wiht the rear still together and in the air, if you tunr one wheel, the other should turn at the same rate, in the same direction. In an open rear, if you turn one in one direction, the other will turn in the opposite direction.

If you are looking at the inside of the carrier, the open rear will have a large opening into the spider gears. When looking in there, you will only see the spiders. The SG rears will have a small opening into the spiders. When you look you, you will either see the clutch packs oaf the clutch style or the springs of the cone style.

NC PUTZER
03-15-2003, 02:39 PM
TO: >>>>>>ED HOSTLER

THANKS AGAIN FOR SHARING YOUR KNOWLEDGE WITH THOSE OF US THAT HAVE VERY LIMITED, IF ANY, KNOWLEDGE OF THE 8 3/4 REAR END.

JOE DENEEN ( NC PUTZER )

NC PUTZER
03-16-2003, 02:11 PM
TO:>>>>>>>>Ed Hostler

With all the info. you posted regarding my questions, I have determined that these rear ends are 8 3/4 and the 3.23 you suggested for me to use sounds great because this will not be a competition car, just for driving enjoyment. All my competition days are in the past and I have very fond memories of that from about 40xxxxx years ago.

Your method of determining gear ratio has me wondering WHAT GEARS are in these 8 3/4. I did as you instructed, raised only one wheel, marked the position of both wheel & drive shaft, then turned drive shaft until the wheel made one complete revolution. The drive shaft was turned only 1 1/3 turns and this would indicate that the gear ratio is only 1.3 something. I tried both wheels and turned the wheel in both directions. The Casting No. on the head is 20707424, with a small changable cast no. 582 below the larger casting no.
Would you have any other suggestions other than pulling the gears out????

Joe Deneen ( NC PUTZER )

ehostler
03-16-2003, 07:54 PM
Hmmm.... Not sure why there is an extra digit at the end of the casting number, but, that is a '742' third member.

1-3/4" large stem pinion... (aka. '742')...
Carrier casting numbers: 1634985 (1957-1964), 2070742 (~1961-1969).
This assembly was replaced by a phase-in of the 1-7/8" pinion starting in the 1969 model year. 1970 RW (Plymouth and Dodge mid-size) were the last models to use the 1-3/4" which appeared in a 2881489 case. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications. Pinion depth and bearing preload is set with shims. Differential bearing setting (ie. backlash ) is set with threaded adjusters.


My bad... As it is an open rear, you have to multiply the drive shaft turns by 2, to get the actual ratio. The drive shaft probably turned about 1.38 times (pretty hard to measure that far down by eye). That would give you a 2.76 gear ratio.

I would go with the 2.76 for now and watch for a 3.23 to come along. Not knowing the weight of your car, you may actually like the 2.76 ratio.

The 2.76 is great for highway cruising and highway mileage. the 3.23 will give you a little better low end power and better gas mileage in town.

NC PUTZER
03-16-2003, 10:29 PM
TO:>>>>>>>>>> ED HOSTLER

Again thanks for your most valuable info.

Have you ever posted any info. about removal of axle and gears in the 8 3/4????? Say for replacement of seals or bearings.

Should anyone need specs. on 1935--1951 Chrysler, DeSoto, Dodge, Plymouth, I would be happy to share.

Joe Deneen ( NC PUTZER )

ehostler
05-28-2003, 08:26 PM
*** The chart has been updated with a new illustration. Take a look at the fine work that AJMOPAR has done on the illustration ***

Axle Dimensions (http://hemimopar.freeyellow.com/rear/axle1.jpg)

ehostler
04-21-2004, 06:59 PM
I lost my free storage space... Here it is in an attachment (I had to increase the compression a little).