Okay, thanks for the tips guys! Drew a circle (sketch) on each the original gear files (diameter equal to the pitch diameter), and hid the circle sketches. Mechanical mates worked perfectly! This is very exciting
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz