Original Porsche Part Genuine Porsche part 90130222602

Dog Teeth 3rd/4th/5th Gear. (3 per gearbox)
G901 2rd to 5th Gear,
G915 3rd to 5th Gear

Manual transmission gear teeth are precision-engineered ridges on the gears inside a manual gearbox. These teeth interlock to transfer power from the engine to the driveshaft. Their exact shape and alignment ensure smooth gear engagement, efficient torque delivery, and dependable performance across all gear ratios. Keeping the gear teeth strong and undamaged is crucial for preventing slippage, maintaining power, and extending the overall life of the transmission.

Fits:
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera (915 Gearbox)
Porsche 911 1978-1983 3.0L / SC (915 Gearbox)
Porsche 911 1984-1986 3.2L (915 Gearbox)

Signs of Manual Transmission Gear Teeth Failure

• Grinding or whining noises during shifting, often caused by worn or damaged teeth.
• Difficulty engaging gears due to misaligned or broken gear teeth.
• Loss of power or gear slippage when the teeth can no longer mesh correctly.

Diagram Ref no 6, 15, 23.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90130224203

The product you are viewing cross references to these numbers

Dog teeth 1st gear, G901 1st gear
Dog Teeth 911,912 1965-71, 914 All 1st Gear with 5-Speed transmission only, 2 slots in hub 
Sold individually

Fits:
Porsche 911 1965 - 1971
Porsche 914 All 1st Gear with 5-Speed

The dog teeth ring forms part of the gearbox synchroniser assembly. It works with the synchro ring, operating sleeve, and gear hub to allow the selected gear to engage smoothly. On 1st gear, the dog teeth are critical for clean gear selection, especially during low-speed driving, manoeuvring, and gearbox operation from rest.

Functions
•  Replaces the 1st gear dog teeth ring
•  Helps restore correct 1st gear engagement
•  Works with the synchro ring and operating sleeve
•  Supports smoother gear selection
•  Helps reduce crunching, baulking, or poor shift feel
•  Suitable for gearbox rebuilds and synchroniser repairs
•  OE Match replacement for classic Porsche transmission service.

Why Replace This Part?
Dog teeth can wear, chip, round off, or become damaged through age, high mileage, poor lubrication, worn synchro parts, or aggressive gear changes. Worn 1st gear dog teeth may cause difficult gear engagement, crunching, jumping out of gear, or poor shift quality. Replacing the dog teeth during gearbox overhaul helps restore reliable synchroniser operation and smoother 1st gear selection.

When to Replace This Part
•   1st gear is difficult to select
•   Crunching or baulking occurs when engaging 1st gear
•   The gearbox jumps out of 1st gear
•   The dog teeth are chipped, rounded, worn, or damaged
•   The synchro ring or operating sleeve is being replaced
•   The gearbox is being rebuilt or inspected
•   Preventative replacement is being carried out during transmission overhaul

Where it fits on the car
This dog teeth ring fits inside the gearbox on the 1st gear synchroniser assembly. It forms part of the internal gear engagement system and should be installed according to the factory gearbox layout.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90130224106

The product you are viewing cross references to these numbers