Need help identifying an 8 3/4

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Wilson0208

Wilson0208

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I picked up a used diff and none of the casting numbers match anything I have found listed. It has the older axles in it so I assume its a pre 1964. Any help with IDing this thing and possibly retrofitting newer parts would be a huge help.

3rd member casting number= 1327888-2
Also has a 135 above it.
I cant find a casting number on the carrier, and the lugs on it are bolts threaded into the hub.
 

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Ok, I originally posted this on the wrong 8 3/4" thread. But here is some info. Unfortunately, I didn't see anything close to the numbers you posted.

[ame]http://bionicdodge.com/Download/Mopar_8_3_4_Rear_End_Guide.PDF[/ame]
 
Thanks for the reply. That's my problem for sure, none of the articles I've read have any info regarding this one in particular. Hope it wasn't a waste of money...
 
Could not find the number but was able to find this for 57-64. May not be the complete list.

The Chrysler 8-3/4" rear axle assembly was introduced in 1957.

1-3/8" small stem pinion (741) Carrier casting numbers: 1820657 (1957-1964)
1-3/4" large stem pinion. (742) Carrier casting numbers: 1634985 (1957-1964)

Here's where I found info: http://www.moparfins.com/Repairs/8-3-4_Rebuilding/Information_on_Mopar_Rears.htm
 
Unfortunately that's what I was afraid of. I can't find any info on it at all. The pinion yolk is different than any I've seen also. Not entirely sure where to turn for some info either.
 
That looks like a 1930's-1950's Chrysler 8-5/8" or 9-5/8". The rear axle used under early Dodge Trucks (and under the front of WM300 Military Power Wagons), it was the axle that inspired the 8.75" and the 9"

It's probably about 62" wide from WMS to WMS, right? If so that's a 1948-1953 B-Series (Pilothouse) Truck Rear. Most Likely has 4.78, 4.89 or 5.13 Gears in it.
 
It's 53 1/2 backing plate to backing plate, and 41 from perch center to center. Well, that would explain why I can't find any info on it. Not the diff I need for sure. The drums have straps with springs around them.
 
Perches should be about 1.5" or 1.75" wide at most, if I remember correctly (The B-series trucks ran very skinny leaf springs). I can't remember if they were 1.5" springs or 1.75" springs though. Which is sad, because I have a stock (not for long) 1948 B-Series truck and I've been around the differential and springs in it a lot, replacing shackles, brake lines, etc.
 
Wilson0208 said:
I picked up a used diff and none of the casting numbers match anything I have found listed. It has the older axles in it so I assume its a pre 1964. Any help with IDing this thing and possibly retrofitting newer parts would be a huge help.

3rd member casting number= 1327888-2
Also has a 135 above it.
I cant find a casting number on the carrier, and the lugs on it are bolts threaded into the hub.
Click to expand...

It will either have 10 or 16 spline axles and there is no after market support for it as far as I know.
 

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It does have 10 studs. The pinion seal is 4 inches in diameter. So most likely a 9 5/8 assembly from an early dodge or power wagon. The perches are 2 1/4 wide, if I can nail down a type I can hopefully recoup my money. Thanks for all your help. I would have never thought to check that old.
 
It was supposed to go in my 67 dart. Just finished the 340 and am looking to get rid of the 7 1/4 for the 8 3/4. What I get for not checking numbers before I forked over the cash.
 
I have Hollander Interchange manuals all the way back to the 20s through 2006 and I pulled some that cover from the late 30s through the the late 60s but I never found that case number.
 
That is no 8 3/4" center section! Also, no configuration I've ever seen regarding the shock mounts directly on the spring perches!! Probably not gonna work under your dart!! :-(
 
Even though it looks like an 8 3/4" it's actually an 8 1/4" that dates back as far as 1937, it did have 10-spline axles and some had 16-spline axles.

The old 8 1/4" has 11 attaching fasteners instead of the 10 that the 8 3/4" has...
 
Ive been searching for any type of 3rd member that matches the one I have with the u joint installed in it like mine. No luck so far with searching chevy, toyota, mopar, and ford. I can't pull the center yet, don't have a puller to get the axles out.
 
It has 10 studs and nuts though.....
 

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What size are the wheels? 14", 15" or 16"? Look on them to see if there is any id? The screw in lug bolts are a clue, 1955 was the last year for DeSoto and Chrysler and 1958 Plymouth. I think Dodge mostly used studs???
 
gregpurcell said:
Some of the late 50's Chevies had a 3rd member type rear that resembled a Mopar 8 3/4.
Click to expand...

The Eaton HO52 and HO72 are the axles you're thinking of (used in 40's-70's Chevy's). The OP's rear axle is Not an Eaton 52/72, that's for sure (I have one of those laying around for a project, they're one of the most bullet proof axles ever made.)


This is what an HO52/72 looks like : Note that it has a Drop Out 3rd Member AND A Differential Cover, and a Bolt On Bearing Retainer (like a 9")


http://ylobronc.users.superford.org/parts/eaton1.jpg

https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-ash3/9064_10151630266323291_1618860141_n.jpg


And just for the record (I won't include the 8.75" or the 9" since everyone knows what they look like)


Toyota 8" (Also a 3rd Member Differential)

http://hd.sr5.com/wp-content/uploads/2013/05/100_2533.jpg


Dodge D50 8.5"

http://i720.photobucket.com/albums/ww202/hamstrung2/D50 MiniRam/cd2.jpg



Mazda uses an 8.5" Variant of the D50 axle. Nissan and some others use a variant of the Toyota 8". One thing to keep in mind. All Import Axles (Toyota 8, D50 8.5, etc) Are 6-Lug Pattern Axles. Not to mention the axle in question predates all of the import axles by at least 30 years.
 
They are 15" wheels. They have the chrysler pentastar on them with a 13 next to it. Also it has a "Detroit" u-joint installed.
 

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