as for diffs etc...
I would be careful with trying to use the 415 diffs as they may use different outdrive bearings (and therefore may not fit into the eccentric ta05 gearbox housing adaptors) remember the ta05 is not a trf designed car so it is not likely it will share the same diff output bearing size as the trf series cars.
If the 415 diffs do fit you will then you may need to use the 415 centre pulleys too.
in all honesty, ive not tried 415 diffs or big pulleys