Seems to be both the
--->4670 optima over drive
--->4672 optima under drive
But I also have 46 and 48 t gears.
How do you swap the plastic? Press the metal part to split in two?
Also have 4738 Final Pinion
Probably going to use these in my Optima Pro build.
This appears to be a complete Thorp Optima gear set
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