[TR] HVDA 5-speed in TR6--speedo gear

[Tim Gaines]

Questions for those who have done Herman van den Akker's 5-speed Toyota transmission conversion on their TR6s, as I did several years ago.  As I was led to expect from Herman's excellent instructions, my Smith speedometer reads slower by about 5-7 mph than a gps tells me.  Herman's advice in his manual is to get the speedometer recalibrated, but that appears to be a $150 - $200 job, and anyway I don't relish getting behind the dash again.  Why not just calculate the number of teeth needed on a replacement driven speedo gear to match up with my gauge, I thought.  Those gears seem to cost about 25$ - $30.  Without knowing yet whether my W58 Toyota tranny has a 10 or 11 tooth drive gear (apparently 10 is more common?), I have done some preliminary calculations and found that a driven gear with either 25 or 28 teeth should get me close to an accurate mph reading (for a 10 or 11 drive gear).  However, the lowest I have found so far is a 30-tooth driven gear.

Questions:  Are there Toyota W58 speedo driven gears with 25 or 28 teeth (for 10 or 11 drive gear teeth)?  If so, where do you get them?

Thanks for any help you can give me.

Tim Gaines
Clinton, SC
1974 TR6
1980 Spitfire

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