Little Samson offers complete sets of machine cut road gears in 3" and 4" scale.
Differential gears in 3" and 4" scale are offered with the choice of either machine cut gear cut teeth (contracted out professionally & precision cut), or with the teeth cast in from gear cut patterns. In 6" scale the gear cutting is available only from customer's machined blanks. The differential gears are only available with 'as cast' teeth, however due to the large tooth size little fettling is needed.
All cut gears, including differentials, are a stock items.
Gear cutting the road gears to your machined castings is only £129 in 3" scale (50p per tooth) and £155 in 4" scale (60p per tooth)