[Healeys] Dealing with the Highway Patrol

[Bob Spidell]

The indicated speed was (more-or-less) exactly 11% low, which is what you'd expect going from a 3.91 to a 3.54 rearend. 

There's two parts to modifying a speedo for a different rearend: changing the gearing on the tripmeter and odometer and changing the speed readout. The shop did the former, but (apparently) forgot to do the latter. They fixed it no-charge. 

I checked the odometer against the roadside markers and it was spot-on, and didn't notice the incorrect speed readout since I didn't have a GPS or other means to calibrate. I've since found helpful websites that will give the expected speed if you plug in gearing and RPMs. 


bs 

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Bob Spidell - San Jose, CA 



Bob: You left us hanging! How did your GPS speed compare to the rebuilt 
speedo? (I won't ask why you didn't know beforehand) ;-) 

(The Other) Len 
Vacaville, CA, USA 
1967 AH 3000 MkIII, HBJ8L39031