how to find the right speedo gear?

Transmission and Drivetrain Tech

  1. V8-valiant

    V8-valiant Well-Known Member

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    hello all, just wondering how to find out what speedo gear will get me accurate speed? ive got a 26.5" tall tire, 3.55 gears, and a four speed? thanks alot!
     
  2. fstfish66

    fstfish66 Well-Known Member

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  3. ted_sweet

    ted_sweet Well-Known Member

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  4. 68 A

    68 A Well-Known Member

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    i've been wondering about that as well for the past year. It appears that my car tops out at 100 mph. I was estimating 90 before.

    Thanks!

    Steve
     
  5. V8-valiant

    V8-valiant Well-Known Member

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    thanks guys for all the help!!
     
  6. super70bird

    super70bird Well-Known Member

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    If this helps anybody, here's the "master" list of speedo pinions still
    availble for 66-75 Mopars (fit all transmissions versions):
    # Teeth P/N Color

    *24 3410024 WHITE

    *25 3410025 BLUE

    26 2538926 RED

    27 52068149 WHITE

    28 52068150 BLUE

    29 52068151 BLACK

    30 52068152 YELLOW

    31 52068153 GREEN

    32 52068154 BLACK

    33 52068155 YELLOW

    34 52068156 GREEN

    35 52068157 ORANGE

    36 52068158 RED

    37 52068159 WHITE

    38 52068060 BLUE

    39 52068061 GREEN

    40 52068062 ORANGE

    41 2538941 RED

    42 2538942 WHITE

    43 2538943 BLUE

    45 2538945 (Disco’d -ref.only)

    * These pinions require a special adapter, now disco’d (2892994.) Allothers
    use 2538608. Don't forget new seals - pkg. 4883434AA
     
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