Tera Low sells 3.15 gears for the Spicer 18, but I already have 2.46 gears. I can get the Tera gears for $500, but is that a waste of money? I will have a T-98 with 6.4:1 first gear, and 5.38's in the axles. I am just having a hard time deciding whether it is worth $500 to go from 84.7 to 1, to 108.4 to 1. I will have 38.5 SX's, and I don't really think either ratio will be low enough.