BMW Getrag Manual Transmissions — GS5 and GS6 Guide

Overview

BMW has used Getrag manual transmissions across most of its lineup. The two main families are the GS5 (5-speed) and GS6 (6-speed).

GS6-37BZ / GS6-53BZ (6-Speed)

Used in: E46 330i, E90 335i, E82 135i, F30 335i

Specifications:

• 6 forward gears + reverse
• Torque capacity: 370-530 Nm depending on variant
• Synchromesh on all forward gears
• Dual-mass flywheel (DMF)

Common Issues:

1. Clutch Delay Valve (CDV)

• BMW installed a restriction valve in the clutch hydraulic line to smooth engagement
• Makes the clutch feel vague and slow
• Fix: CDV delete — remove the valve for direct clutch feel. Simple 30-minute job.

2. Dual-Mass Flywheel Failure

• DMF absorbs drivetrain vibrations but wears over time
• Symptoms: Rattling at idle, vibration in neutral
• Fix: Replace DMF (~€400-800) or convert to single-mass flywheel (SMF)

3. Shift Linkage Bushings

• Rubber bushings in the shift linkage wear, causing sloppy shifts
• Fix: Replace with polyurethane bushings (~€20-50)

4. Input Shaft Bearing

• Can develop noise on high-mileage cars
• Symptoms: Whining in neutral that goes away when clutch is pressed
• Fix: Bearing replacement (requires transmission removal)

Fluid & Maintenance

• Fluid type: BMW MTF-LT-2 or Redline MT-90
• Change interval: Every 60,000 km
• Capacity: ~1.5-1.8 liters
• Fresh fluid makes a dramatic difference in shift quality

Clutch Upgrades

Power Level	Clutch Recommendation
Stock-Stage 1	OEM Sachs or LuK
Stage 1-2	South Bend Stage 2
Stage 2+	OS Giken, Spec Stage 3
500+ hp	Twin-disc (OS Giken, Tilton)