BMW 6-Speed Manual Gearbox GS6-45BZ THD4 – Genuine/OEM Transmission Assembly 23007599342 (23 00 7 599 342) – Fits 135i 1M 335i 535i N54/N55 – E82 E88 E90 E91 E92 E93 F10 F11 – Stick Shift/Manual Swap Replacement for 1/3/5 Series

BMW 6 speed stick shift gearbox GS6-45BZ THD4 | OE spec replacement for 135i, 1M, 335i, 535i

Restore crisp shifts and factory driving feel with this original BMW 6 speed manual box. This GS6-45BZ THD4 unit is the correct direct-fit transmission for selected 1 Series, 3 Series and 5 Series turbo six models, delivering the precise engagement, refinement and durability enthusiasts expect from a genuine BMW part.

Part number: 23007599342

Transmission ID: GS6-45BZ | THD4

Why this OE unit is the smart choice

• Direct replacement manual gearbox that bolts straight up to the factory hardware and mounts
• Correct ratio set and shift quality matched to the original driveline for road and spirited use
• Ideal fix for worn synchros, crunching gears, whining bearings or notchy gear changes
• Genuine BMW engineering for long term reliability and smooth engagement
• Trusted by our customers — we have supplied and installed these with excellent feedback on refinement and shift feel

Vehicle compatibility

Supplied for the following models when confirmed against your VIN or UK registration:

• 1 Series
  • E88 Convertible 135i 09/2009 to 10/2013
  • E82 Coupe 135i and 1M 09/2009 to 10/2013
• 3 Series
  • E90 LCI Saloon 335i 09/2009 to 12/2011
  • E91 LCI Touring 335i 09/2009 to 05/2012
  • E92 LCI Coupe 335i 11/2008 to 06/2013
  • E93 LCI Convertible 335i 11/2008 to 10/2013
• 5 Series
  • F10 Saloon 535i 01/2009 to 06/2013
  • F11 Touring 535i 02/2009 to 06/2013

What you can expect

Factory-fit installation, confident gear selection and the robust performance you want from a BMW manual transmission. Our customers consistently report smoother changes, reduced driveline noise and a renewed, tight shift action once fitted.

Pre-dispatch compatibility check

To guarantee the correct unit for your car, provide your UK reg or the last 7 digits of your VIN at checkout. We will verify suitability before shipping.

Professional installation and support

Fitting available at MJ Modifications in Warwickshire. Request a quote via info@mjmodifications.co.uk. We can also supply complementary parts often replaced at the same time such as clutch kit, dual mass flywheel, release bearing, fork, pivot, gearbox mounts and fresh fluid.

Manufacturer warranty

Two year manufacturer warranty for UK customers and one year for international customers when a VIN is supplied for a compatible vehicle at checkout.

Also searched as

BMW stick shift gearbox, 6 speed manual box, GS645BZ THD4, THD 4 ratio set, OE BMW transmission unit, factory manual trans, BMW gearbox assembly 23 00 7 599 342, E82 135i manual box, E88 135i transmission, E90 E91 E92 E93 335i 6 speed, F10 F11 535i manual, replacement driveline, synchro crunch fix, gearbox swap, manual conversion parts, BMW manual shift transmission, OEM BMW part 23007599342.