if theres no spring and ball in the 2 speed clutch, then the truck will be permanantly in 2nd gear. its 1st gear that ur not able to use with the spring being missing. thats why the 2nd gear spur is worn, yet it isnt changing gear. ive had the same thing mate, u really dont notice that much with stock gears and engine.

as was said - get onto cen about it, they should be able to sell u a pack of 3 springs (1 for mt, one fr rally and one for st) and a few balls should be in the pack too. well... they should be able to give u a part number at least. or ebay for a complete 2 speed clutch unit may be a cheaper, quicker option.

if u cant find any - give me a shout mate, ive got a few spares, just cant remember what setup they are for - mt, st or rally... but might work ok for u... good luck either way.