* 17T x 20T mainshaft 1st gear cluster with a 24T countershaft 1st gear.
* Installation in 1980-86 4sp Big Twin requires purchase of a 21 tooth countershaft 2nd gear AP-202160.
* Best choice for Superglides, choppers and lighter bikes. This is a no clunk 48 mph, 1st gear.
* With Andrews 4 speed gears, transmissions last longer, shift faster, and just plain run better.