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Thread: What Rear gearing was an option in the 70's

  1. #1
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    What Rear gearing was an option in the 70's

    I have a 77 Arrow GT with a Direct-><-Connection LSD
    and I'm woundering what gears came stock as well as optional through
    the dealer as well as after market?
    Question I have is, my rear gear seem really tall, and the motor Revs really high while on the Highway?
    I think I have a 3:54?

  2. #2
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    3.9 to 1 with 1600cc with 4-speed, 3.545 with 1600cc automatic and 3.90 to 1 with 2000cc with 5-speed; 4.22 with 1600 and 5-speed; 3.55 to 1 with 2000cc and automatic.

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    4.22 :shock: holycow!
    If this is right I should have a 3.90rear?

    How do I go about finding out my ratio with out cracking open my pumpkin? ops:

  4. #4
    Administrator john's Avatar
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    Quote Originally Posted by BlownArrow
    4.22 :shock: holycow!
    If this is right I should have a 3.90rear?

    How do I go about finding out my ratio with out cracking open my pumpkin? ops:
    If you have a 3.90, 4000rpm in 4th gear should be right at 70-72mph. Try that first. If your RPMs at 70mph are lower, you have a lower number diff ratio, higher RPM, higher number ratio. :tu:

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    My arrow was a 2000 5sp maual, so should be a 3:90 if joes right.
    But the Original owner (2 people before me) had a LSD instaled at the dealer when purchesed, but i'm not sure of the gearing?

    I thought there was a math-matic way to spin the wheel 1 rotation and count the drive shaft rotations then us that math stuff to figure it out?

  6. #6
    Administrator john's Avatar
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    Quote Originally Posted by BlownArrow
    I thought there was a math-matic way to spin the wheel 1 rotation and count the drive shaft rotations then us that math stuff to figure it out?
    Yes, there is. It's just never worked for me. :P

    The 70mph test is easier... 8)

  7. #7
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    You can also get gears off a sapporo rear end assuming yours is still a 180mm Give you the option of a 3.3 if you can find it

    if you get hard core enough to look inside

    3.54 has a 39 tooth ring with a 11 tooth pinion
    3.90 has a 43 tooth ring with a 11 tooth pinion
    4.22 has a 38 tooth ring with a 9 tooh pinion

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