Not Camaro related - but GM nontheless...
A friend has a beautiful 57 Corvette with a ZZ3 crate engine in front of a GM Saginaw (3351325 casing) 4 speed and has an inaccurate speedometer. It reads out 70mph at an actual 60pmh GPS verified speed. The speed read out discrepancy continues at all speeds apparently as well - 30mph reading 40, 50 reading 60 etc..
Anyone have an idea as to how to rectify the problem?
He pulled out the gear at the tranny end of the speedo cable and tells me it is white with 19 teeth.
The car has a rear axle ratio of 3:70 or so according to him, and now has tires that are 205/70/15 in size..
I know all kinds of gears are available to correct similar problems - is this what he needs, are they still available from GM or somewhere else readily, and if so does anyone have any idea of what part number and colour of gear he should be looking for to correct such a problem?
Any assistance or advice is very much appreciated!
Thanks in advance - Randy