Re: Repro Speedo Cable Problem
Patrick-----
When you say "including the nuts" do you mean with the nuts pulled forward as far as they will go (i.e. seated on the flare of the end fitting)? The standard method for measuring speedometer cable assembly lengths is to measure the casing from end-to-end exclusive of the nuts.
Assuming your transmission and rear end are original to the car, then the installed speedometer DRIVE gear should be the GM #3708145. That gear is compatible with the green 3860345 DRIVEN gear. However, it is NOT compatible with the 21 tooth GM #3987921. There is no DRIVEN gear of less than 22 tooth count that is compatible with the 3860345 DRIVE gear.
Patrick-----
When you say "including the nuts" do you mean with the nuts pulled forward as far as they will go (i.e. seated on the flare of the end fitting)? The standard method for measuring speedometer cable assembly lengths is to measure the casing from end-to-end exclusive of the nuts.
Assuming your transmission and rear end are original to the car, then the installed speedometer DRIVE gear should be the GM #3708145. That gear is compatible with the green 3860345 DRIVEN gear. However, it is NOT compatible with the 21 tooth GM #3987921. There is no DRIVEN gear of less than 22 tooth count that is compatible with the 3860345 DRIVE gear.
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