Rear end tag deciphering

Transmissions and Rear Ends

  1. rcmaniac791

    rcmaniac791 Well-Known Member

    Messages:
    223
    Likes Received:
    67
    Joined:
    Nov 4, 2015
    Ok, so I recently serviced the rear end in the 5th (7 1/4 w/ 2.26 gear) and while I'm unimpressed with the gear ratio, I noticed 2 tags on the rear end. I expected one of them there for the gear ratio, but I wasn't expecting 2. I'll post the pics below. Looks like one of them says 2.2 (probably for the gear ratio) and the other looks to say 0274. Not sure what that's for.

    I should also mention that the gears looks factory fresh in this thing which I'm happy about

    IMG_1954.JPG IMG_1955.JPG
     
  2. Aspen500

    Aspen500 Well-Known Member

    Messages:
    3,904
    Likes Received:
    1102
    Joined:
    Feb 14, 2015
    Location:
    Rib Mountain (Wausau) WI
    Yes, the 2.2 is for 2.26 gears. The other tag,,,,,,,,,,,,,,,,possibly a date code? They're usually 4 digits anyways.
     
  3. DCAspen

    DCAspen Well-Known Member

    Messages:
    958
    Likes Received:
    191
    Joined:
    Sep 27, 2011
    Location:
    ct.
    what year car?
     
  4. rcmaniac791

    rcmaniac791 Well-Known Member

    Messages:
    223
    Likes Received:
    67
    Joined:
    Nov 4, 2015
    1984
     
  5. DCAspen

    DCAspen Well-Known Member

    Messages:
    958
    Likes Received:
    191
    Joined:
    Sep 27, 2011
    Location:
    ct.
    0274 date code.27th day of 1984.a 3 digit date code,the 1st 2 digits would be the week of manufacture.
     
    rcmaniac791 likes this.
  6. rcmaniac791

    rcmaniac791 Well-Known Member

    Messages:
    223
    Likes Received:
    67
    Joined:
    Nov 4, 2015
    That makes sense. The DOM for the car is February of 1984, so that fits perfectly.
     
  7. DCAspen

    DCAspen Well-Known Member

    Messages:
    958
    Likes Received:
    191
    Joined:
    Sep 27, 2011
    Location:
    ct.
    Glad I could help.
     
  8. BudW

    BudW Moderator Staff Member

    Messages:
    3,591
    Likes Received:
    954
    Joined:
    Mar 4, 2012
    Location:
    Oklahoma City
    Glad to see you are changing the fluid in your diff! It is often overlooked.
    It only holds 2.2 pint (1.1 US Quart) of fluid so any leaks can wipe out the bearings in no time.
    BudW
     
  9. rcmaniac791

    rcmaniac791 Well-Known Member

    Messages:
    223
    Likes Received:
    67
    Joined:
    Nov 4, 2015

    The fluid was changed when I first got the car in 2013, but that was almost 30,000 miles ago, and I wanted to inspect the rear since the 7 1/4 is not known to be the strongest axle. I do like to keep things well-maintained! The shop that did the work originally lathered on the RTV for the diff cover. I used a gasket so it took longer getting all the RTV off than it did anything else!