not anymore, you can get the 4.7 gears for $399 now 
Hmmmmm, 1:1, 4.24:1, 4.71:1, and
19.98:1!!!

Cost: $399 (Toy gears) plus $675 (Kicker 2) plus $0 (already have CM rockcrawlers) plus $0 (already have toy axles with 4.10s)
Let me sharpen my pencil a bit.

GV 4spd auto with CALMINI Rockcrawler underdrive and a 4.7:1 Toy t-case
2.46 x 4.24 x 4.71 x 4.10 = 201.43 to 1. And don't forget to add the torque converter reduction too.

Not too shabby.

Now, are you and Glenn going to try to talk me into it?