the nylon/plastic gears are very durable, unless you are drag racing the car. For normal driving they will hold up very well. You should be able to get the correct tooth speedo gear at numerous vendors. Summit, FMR, 5.0 Resto, etc.
I put 3.55 gears in on of my AOD cars a few years ago and it took all of about ten minutes to change out the speedo cable gear and it was dead on.
3.73 may be different, not sure.
__________________
Jim
for the first time since 1998 there is only two left:
1984 Oregon SP unmarked
1986 Idaho SP
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