Is that a 8 3/4?

[Mopewbie]

Trying to find out which diff is this one? Any guess?

All the references I find for 8 3/4s shows no screws on the back plate.

I need to buy the gasket and driveshaft seal.

Thank you.

 

[rklein71]

no, 8 3/4 pictured below.

 

[Mopars & Missiles]

 

[Xcudame]

My guess would be an 8 1/4 as they were used on some 318 and slant six E-Bodies. Definitely not an 8 3/4 and looks too small to be a Dana 60.

 

[Mopars & Missiles]

Almost impossible to tell from the poor angle of the photos, but it looks as though the top of the rear is rounded and the bottom has a flat area on it. I'll wager 7 1/4.


Of course, it would also have helped to know what make, model, year this is in.

 

[Mopewbie]

Almost impossible to tell from the poor angle of the photos, but it looks as though the top of the rear is rounded and the bottom has a flat area on it. I'll wager 7 1/4.


Of course, it would also have helped to know what make, model, year this is in.

I just realised with your comment that I'm asking in the qrong place. I asked something about the challenger and forgot to change the forum.

Anyway... this car is a 1970 Coronet 440 5.2

Sorry about the poor angle, the tank is right behind it making it impossible to take a good pic.
I'll jack the car up on Friday, clean it an take a good picture.

 

[Mopars & Missiles]

Thanks for that additional information. Even though its a 70 B body, it still can't be an 8 3/4 rear due to the bolt on rear cover of the differential. Better pics might help if you can get them, otherwise its hard to tell what it is.

If its possible without going to a lot of trouble, try to get a rough measurement of the OD of the axle tubes too. That might help some too.

 

[Vaanth]

Trying to find out which diff is this one?

The rear axle pictured in your 1970 Coronet is an 8-1/4".

 

[Mopewbie]

Better pics!!!
10 bolts.

 

[toolmanmike]

Better pics!!!
10 bolts.

View attachment 134210

View attachment 134211

8 1/4

 

[Mopars & Missiles]

Agree, with those pics it really does appear to be an 8 1/4.

 

[TomIGo]

I am wondering if it is a newer (2011 and later + ZF) rear end. Never mid, based on the latest pics that were added above! This is not an 2011+Zf. Appears to be the 8-1/4, but where is the fill plug??!

 

[TomIGo]

Oh, I see the fill plug in the side-view of the diff in pic 2.

 

[Mopewbie]

Oh, I see the fill plug in the side-view of the diff in pic 2.

Exactly, that's what was getting me as well.

 

[Vaanth]

The early 8-1/4" axle had a threaded filler plug on the upper right of the differential casting. This plug location was used from the initial 1969 8-1/4" axle until the late 1976 8-1/4" axles.

In late 1976, the threaded filler plug for the 8-1/4" axle was relocated to a new cover using a rubber filler plug. The 9-1/4" axle and 7-1/4" axle changed from a threaded filler plug on their covers to a similar rubber filler plug.

9-1/4" shown, 8-1/4" axle is similar.

Reference: Chrysler Technical Service Bulletin (TSB) # 03-08-76:

 

[Mopewbie]

The early 8-1/4" axle had a threaded filler plug on the upper right of the differential casting. This plug location was used from the initial 1969 8-1/4" axle until the late 1976 8-1/4" axles.

View attachment 134272

In late 1976, the threaded filler plug for the 8-1/4" axle was relocated to a new cover using a rubber filler plug. The 9-1/4" axle and 7-1/4" axle changed from a threaded filler plug on their covers to a similar rubber filler plug.
View attachment 134273
9-1/4" shown, 8-1/4" axle is similar.

Reference: Chrysler Technical Service Bulletin (TSB) # 03-08-76:
View attachment 134271

Excellent material, thanks for sharing.