Need help with 69 trans and rear end codes - NCRS Discussion Boards

Need help with 69 trans and rear end codes

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  • Joseph H.
    Very Frequent User
    • December 11, 2007
    • 159

    #16
    Re: Need help with 69 trans and rear end codes

    OK, here is some info. I tried the speedo test @1500 and 2000 RPM.
    1st gear 1500 RPM, 11MPH 2000 RPM, 15MPH
    2nd gear 1500 RPM, 15MPH 2000 RPM, 19 MPH
    3rd gear 1500 RPM, 18 MPH 2000 RPM, 24 MPH
    4th gear 1500 RPM, 26 MPH 2000 RPM, 35MPH 2500 RPM, 42MPH

    The differential cast date is G 3 8. Is that July 3rd,1968 or 1978. Again the stamp on the bottom reads what I think is O A W 1 9 8 E 3. It has a 2 1/4" 7 LEAF spring. with 7/16" bolts holding it in.

    I did the turn the wheel test to get the gear ratio. The drive shaft turns just over 3 times for 1 complete rear wheel turn, so I think it is safe to say 3.08 gears, would everyone agree. To figure out what Drive and Driven gears I need does the type of Muncie trans make a difference?

    Can you tell me what I have and what I need?

    Now the really bad news. I do not even know which speedo drive gear I had because bubba knocked it into the tail housing when checking it. Any recommendations there?

    Also, sorry the car has F70-15 reproduction redlline tires

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