Q-9008 (single front axle with flange) and Q-9005 series (4x4 and 6x6 combos with hex or flange) have 1/2.6 ratio. Unfortunately single front axle with hex isn't available, but they said they would forward my request to their design department over a year ago.
https://www.stellamodels.com.hk/adva...rds=lesu+ratio
http://www.rclesu.com/SK.html