This package adapts a BMW ZF 5 speed transmission to a K series powered Miata. It's designed to work with all existing KMiata swap kit components and gives K series users a very stout transmission option to handle huge power. 

If you are interested in some additional KPower options, we offer a longer 5-speed transmission with our E30 Getrag 260 transmission package. We also offer our K or BP to BMW ZF 6 transmission option.

New for 2025: Our new 3.5" aluminum driveshaft features larger diameter splines machined to ultra-tight tolerances, eliminating the slop sometimes found in older steel shafts with smaller splines. This design ensures consistent smooth power delivery, improved durability, and vibration-free operation even at high speeds, having been thoroughly tested to 150+ mph on the racetrack.

All parts included are proudly made in the USA.

Lead times for shipment vary, always reference our Current Lead Times page for up to date timeline for order fulfillment.

This package includes:

-Engine/transmission adapter plate, CNC machined steel, zinc plated, with all hardware

-Flywheel that bolts to the K series engine and accepts an OEM style E46 clutch kit (13 lb, 6061 aluminum), with replaceable friction surface.

-Custom extended release bearing (required to keep the weight low on our flywheel)

-Short shifter, stainless steel, with Miata geometry on top (Miata 10x1.25 thread pitch, height, shape, and throw are identical). The shifter has transmission-specific BMW geometry on the bottom. Ball bearings replace the OEM BMW plastic components for improved shifter action.

-Custom length selector rod, aluminum, dual shear design. Our design eliminates components that often result in a sloppy BMW shifter.

-Custom selector joint (no more worn plastic bushings) and stainless steel shifter pins, with retainer clips.

-Shifter plate, billet aluminum, that bolts to the top of the Miata transmission tunnel and replaces the rubber Miata outer boot. It accepts the BMW shifter ball bushing and our custom short shifter in the center

-NEW aluminum 3.5" driveshaft. Can be configured to bolt to a GM Getrag diff or a solid-mounted Miata Torsen diff

-ZF 5 speed rear transmission mount, powdercoated steel, with all hardware (tunnel mounted)

-Upgraded rear transmission rubber or poly bushings

-3/4” Wilwood clutch master cylinder kit with braided stainless clutch line

-E36 clutch slave cylinder, Sachs brand or equivalent

-BMW reverse light connector with pigtails

Notes: 

• An E46 clutch kit must be used with our flywheel, specifically a clutch kit for a 330i 5-speed car (10 spline, 240mm clutch disc). It must be a kit that includes a pressure plate designed to fit an OEM E46 flywheel.
• Use Honda flywheel bolt 90011-RDB-000 only.
• Download installation instructions here

KPower Recommended Supporting Products:

• Miata Differential Mount for PPF Delete (Required for stock Miata differential)
• ACT HD Clutch kit or Spec Stage 1 Clutch kit for street use
• Spec Stage 3+ Clutch kit for high heat/track use
• Haltech GPS Speed Sensor for customers running a Haltech ECU wishing to retain a working speedometer as the Miata speed sensor is lost when removing the stock transmission
• Getrag Differential Upgrade