Please identify this rear diff

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Jul 28, 2023 | 08:37 AM

1949Red

Thread Starter

Mountain Pass

Joined: Nov 2020

Posts: 217

Likes: 117

From: Saskatchewan, CANADA

Please identify this rear diff

Hi all, let me give you a quick background. I have very little background in mechanics and have learned so much from reading posts in this forum. I'm still looking for a reliable inexpensive rear diff to put under my 1948 F1. See pic below:

The owner of the frame below says it's from a 1968 Merc. I will assume that the 5 bolt pattern means it's from a half ton. I also believe that it's the popular 9' . Can you please explain what all these letters represent on the diff? Thank you inadvance.

Is there any other notable markings on these pics that I should be educated on before I make an offer. (ie 28 spline, possible hwy speed, etc.) Thank you, Rex

Jul 28, 2023 | 10:41 AM

f5fordgirl

Fleet Mechanic

Joined: Apr 2012

Posts: 1,275

Likes: 134

Does it have a tag on it with ratio listing, it appers to be a 9 inch from a mid 60's to mid 70's 1/2 ton.

Jul 28, 2023 | 11:26 AM

JalopyJake

Tuned

Joined: Jan 2019

Posts: 308

Likes: 27

From: Fallout Shelter

It’s a 9 inch. The center section is dated 7H22 which is Aug 22 1967. Should be 28 spline.

The C5AW 4668-A is the casting on the “pinion support”. That casting started in 1965 (C5) and went on for several years.