hi Cmendastrtduk/all...well i doubt the e-maxx g/box will fit in ur slayer and as the slayer is quite new maybe no ones made any aftermarket parts for it yet so best bet is too get someone to make you sum cogs out of metal. i had same problem on me e-maxx so i made my cogs (i have a mill and lathe) out of 6082 t6 ally to keep them light, they take the mamba combo at 6s no problem. i trust u like to jump, this is heavy on the transmission how are ur diffs coping? the slayer has switchable diff lock? sounds handy. trouble with having cogs made is you need a different cutter for different size cogs so it can work out dear just to buy the cutters, they around £40.00 each, check my photos on the x project section to see my handy work.