Transmission Swap Kit MX-5 NA / NB / NBFL to BMW GS6-37BZ/DZ Gearbox

Finally, after a long development period, we can offer you the BMW gearbox conversion in the shop! All you need in addition to this kit is the gearbox itself. The kit is made for a BMW GS6-37BZ or DZ gearbox, which was originally installed in the BMW E46 330i.

During construction and development, we made sure that a PPF frame was still installed in the vehicle between the gearbox and the differential. This means that the transmission does not have to be screwed rigidly to the body, which leads to immense vibrations when driving. In addition, the BMW transmission can withstand significantly more power than the original Mazda transmission, which means that the kit is designed for up to 500 hp and 650 Nm.

Shifter:

In the kit you can choose between different shifters with the following advantages so that you can tailor the conversion precisely to a vehicle:

Coolerworx Standard:

• Precise gear shifts with a shortened gear shift pattern
• Sporty design
• Recommended for sporty road drivers with occasional track days

SPS Classic Shifter:

• Subtle design
• Precise gear shifts
• Recommended for ambitious road drivers who place great value on an OEM-like look

Coolerworx Engine Mount Shifter:

• Highly precise gear shifts
• Sporty design
• Recommended for racing vehicles and track tools, as the special design means that the torsional force of the engine is not important anymore, as the shifter moves with it

The kit includes the following components:

• Specially made driveshaft including adapter ring
• Gearbox adapter from Mazda B6/BP engine to BMW GS6-37BZ/DZ gearbox (EN AW-6061T6, anodized)
• Flywheel specially made for us (alloy steel, 6.8kg)
• Short shifter with automatic centering
• PPF frame, which fits on BMW gearboxes and Mazda original differential (7.5kg)
• Adapted shift linkage
• LUK clutch kit
• Wilwood clutch master cylinder
• TRW clutch slave cylinder
• Various screws and mounting material

As already mentioned, the gearbox itself is not included in the price. This must be purchased additionally. The kit is designed for the BMW GS6-37BZ or DZ gearbox, which can be found in the E46 330i.

Here is a list which vehicle used which gearbox and gear ratios:

GS6-37DZ:

• E81 120D
• E82 120D
• E87 Facelift 120D
• E88 120D
• E90 320D
• E91 320D
• E92 320D
• E93 320D
• E60 Facelift 320D
• E61 Facelift 320D

 Caution! This gearbox was built in two variants. We chose the N47 gearbox (starter motor has to be on the lower side) for our conversion. 

GS6-37BZ:

• E46 325TI
• E46 330CI
• E46 330I
• E60 520I
• E60 525I
• E60 530I
• E61 525I

CAUTION! Installing in a MX-5 NA it is necessary to swap the whole speedometer to MX-5 NB! This is not included in the scope of delivery!