Drenth DG400 gearbox
The Drenth DG400 is the Dutch specialist's workhorse sequential: a compact dog-box family serving Formula Ford lineages, kit cars, hillclimbers and rally builds across Europe — the value-engineering alternative in the sequential market.
History
Drenth Motorsport Gearboxes built its reputation from the Netherlands outward as the pragmatic sequential house: transmissions engineered for club and national racing's real budgets, with the DG400 line (and larger DG500 siblings) offering 5/6-speed dog engagement in packages sized for single-seaters, lightweight sports racers and rear-drive conversions alike.
The customer map explains the model's spread: Formula Ford and junior single-seater paddocks running Drenth as the modern-internals alternative to ageing Hewland stock; Dutch, German and Belgian hillclimb and slalom scenes where the marque is near-domestic equipment; kit-car and Westfield/Caterham-style builds; and rally applications where an in-line Drenth undercuts the bigger names. Factory support with quick parts turnaround — the small-company advantage — cemented loyalty.
Second-hand, DG400s circulate through exactly those communities: priced under equivalent Quaife/Sadev units, valued on rebuild status and ratio inventory like all dog-boxes, and backed by a factory that answers emails about twenty-year-old serial numbers — the living-maker guarantee that keeps orphan-transmission risk off the table.
Palmarès
National Formula Ford, hillclimb and slalom championship results across the Benelux and German scenes; club racing and kit-car category wins wherever the marque's value case landed — a customer-results record in racing's cost-conscious heartland.
What to check before you buy
Standard dog-box diligence at friendlier prices: rebuild hours and invoice first (dogs, selectors, bearings are the consumables), exact model and ratio stack second — DG400 variants differ in torque rating and length, so match the unit to your engine and chassis before money moves. Factory identification by serial number is straightforward and worth doing on any used unit. Check case condition and shift-mechanism wear (the barrel and detents tell the hours honestly). The value case is the point: comparable function below big-name pricing, with new availability anchoring the used curve.
Did you know
- Drenth's factory famously identifies decades-old boxes from a serial number and an email — customer service as competitive weapon.
- The marque is near-universal in Dutch and Belgian hillclimbing — some paddocks run more Drenths than all other sequentials combined.
- DG-series internals fit rebuild tooling common to the dog-box trade — any competent transmission shop can service one, by design.
