Quaife In-Line 4-Speed Sequential with Drop Gears — high-quality Quaife product for motorsport and road use.
Designed as a replacement for the Ford Rocket gearbox used for oval / short circuit racing, QBM1M provides ground-breaking levels of user configurability in a compact, state-of-the-art package which is rated to transmit up to 250bhp.
An open face four dog design, four straight-cut gears and a barrel style shift mechanism offer ultra-fast gearshifts with a choice of gear lever locations, while the lightweight, short design of QBM1M allows rearward positioning of the engine within vehicles that previously used a short tailcase Rocket gearbox.
QBM1M’s drop gear mechanism is secured by circlips and is situated beneath a ‘quick change’ cover, enabling users to easily alter the overall gearing. Six drop ratio choices, plus a huge range of 1st to 4th gear ratios means QBM1M users can fine tune gearing to suit circuits or even weather conditions in a matter of minutes.
Key technical features of the QBM1M four-speed sequential Rocket-style gearbox with drop gears:
• Ultra-fast sequential shift with barrel style change mechanism
• Wide range of base gear ratio sets and six drop gear options
• Quick change drop gears for easy overall gearing changes
• Compact design with choice of gear lever locations
Gear Ratios With Base Drop Gear Set
1st 2nd 3rd 4th
2.992 2.063 1.966 1.857
2.393 1.702 1.292 1.000
2.190 1.533 1.179 0.963
2.039 1.376 1.125 0.929
1.821 0.891
Complete Range Available With Drop Gear Sets
1st: 3.31 – 1.600
2nd: 2.28 – 1.210
3rd: 2.17 – 0.990
4th: 2.05 – 0.790
Drop Gear Ratios
Set A: 1.370
Set B: 1.300
Set C: 1.240 (Base Set)
Set D: 1.180
Set E: 1.140
Set F: 1.090
