Transmission and Differential Upgrades

K series Miata Conversion Kit With BMW ZF 5-Speed Transmission Upgrade


$ 5,549.00
K series Miata Conversion Kit With BMW ZF 5-Speed Transmission Upgrade

This is our original KMiata conversion kit, but the original adapter plate and flywheel have been replaced with our complete BMW ZF 5-speed transmission package. 

All products are proudly made in the USA. 

This package is a platform for K swap customers to build their own custom setups. This is the ideal starting point for high horsepower boosted applications.

Pair this kit with big intake manifolds, and custom turbo or supercharger setups. The driveshaft supplied with this kit bolts directly to the GM Getrag differential, because putting boosted K series power through a Miata differential is not recommended. 

We swap out the original K-Miata adapter plate and flywheel for the BMW components, and add in the rest of transmission package.


This package includes (many items not yet pictured):

-Tubular steel subframe, powdercoated black

-Steel engine mounts, powdercoated, with 62A bushings

-Baffled Aluminum oil pan

-Type S oil pump adapter and pickup tube

-Wiring conversion harness compatible with Hondata Kpro with built in relays and OBD2 port

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

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

-Custom extended release bearing

-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, stainless steel, dual sheer design. Our design eliminates all components that often result in a sloppy BMW shifter.

-Custom extended 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

-Steel 500+hp rated driveshaft. Can be configured to bolt to a GM Getrag diff (recommended) 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 hardness options available

-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

-Installation instructions for both the KMiata conversion and the transmission upgrade (download here)



Note: use Honda flywheel bolt 90011-RDB-000

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