I have done the math and my speedo is out by 7 % so if i reduce the gear drive by 1 tooth I get and increase of approx 6% in cable speed close enough for me, But my main question is where can I get the small drive gears? I have tried 3 old Chrysler suppliers here in OZ ands no luck , Mopar Market didn't have them either has any one got a second suggestion.

Pat Blais aka torqueflite patty might have one of those hard-to-find gears

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65 Dart station wagon slant 6 - now under construction
47 Dodge Custom 4 Door sedan
87 D100 Short Bed slant 6

Retired USAF 1966-1986
Retired US Postal Service 2004-2014

Good thinking Don.

If you want to try Pat he has a new email address :

tflitepatty@comcast.net

(tell him that you are from Downunder when you ask him).

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Gary from Downunder
2 weeks ago I couldn't even spell mukanic - now I are one!

Another method of determining rear axle ratio:
http://slantsix.org/forum/viewtopic.php ... 835#325835

I've found that Brewer's Performance has better prices on speedo gears.

Guessing at what parts you need might be more expensive in the long run.