The BMW GS5-39DZ is a five-speed manual transmission supplied by Getrag, one of BMW's long-standing gearbox partners. Its alphanumeric designation follows BMW's internal naming convention, where GS denotes a manual gearbox (Getriebe Schaltung), 5 indicates the number of forward gears, and the remaining digits encode the case family and torque capacity. As a manual unit, it puts shifting authority firmly in the driver's hands — a hallmark of the classic BMW driving experience.
What This Gearbox Is and How It Works
The GS5-39DZ is a conventional constant-mesh manual transmission with synchronized forward gears, driven through a clutch that the driver operates via a pedal. Power flows from the engine through the flywheel and clutch into the input shaft, then across meshed gear pairs to the output shaft that feeds the driveshaft and rear differential. A shift fork and selector mechanism, actuated by the gear lever, engage the chosen ratio through its synchronizer, matching shaft speeds for smooth, positive engagement.
Getrag manual gearboxes of this era were prized for their mechanical directness. The GS5-39DZ delivers the tactile, well-defined gate BMW enthusiasts associate with rear-drive coupes and sedans, and it fits within the broader philosophy explored in our BMW DNA feature on what makes these cars drive the way they do.
Gear Count and Behavior
With five forward gears plus reverse, the GS5-39DZ offers a well-spaced ratio set suited to spirited road use. Typical behavior for a BMW five-speed of this type includes:
- Lower gears tuned for brisk acceleration and responsive throttle pickup.
- A top gear that lowers cruising engine speed for relaxed, economical highway driving.
- Synchronized engagement across all forward ratios for clean upshifts and downshifts.
Compared with the automatics BMW paired to similar engines — such as the ZF 4HP22 — the manual GS5-39DZ trades convenience for engagement and driver control.
Which BMWs Used It
Getrag five-speed units in this family were fitted to rear-wheel-drive BMW models across several generations, matched to inline engines within their torque range. Because BMW rotated gearbox codes based on engine output and application, the surest way to confirm what shipped in a specific car is to check the build data. Use our VIN decoder to verify the original driveline for any chassis you're researching or shopping.
Reliability and Servicing
Getrag manuals of this generation are generally robust when maintained. Key service points include:
- Fluid changes using BMW-specified manual transmission oil to protect synchronizers and bearings.
- Clutch and pilot bearing inspection, as wear here often masquerades as gearbox trouble.
- Shift linkage bushings and selector components, which sharpen shift feel when refreshed.
Owners cross-shopping automatic alternatives from the same period — like the ZF 6HP19 — will find the manual GS5-39DZ simpler to service and rewarding to maintain over the long haul.