predator diffs/gears

[fidspeed]

hi vintage magicians

my boy has "collected" a couple of preds one XRS/ETQ it has metal drive shaft bevel gears and is quiet currently

the other an xk98 is less happy I know gears are unobtainable now but I have heard of tc3 diff retrofits also tm4 gear diffs and possibly Tamiya gears

can anyone guide me to anywhere I can get some help

thanks fellas

dave