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Gearbox Gears / Crown Wheel and Pinion
By OE Match
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Fits:
Porsche 911 - 1965 to 1971
For 901 gearbox
Available with different gear ratios - example - 18:32 (number of teeth on each gear) - 1.78:1 (gear ratio)
18:32 - 1.78:1 (Porsche code "GA")
18:34 - 1.89:1 (Porsche code "F")
17:34 - 2.00:1 (Porsche code "E")
16:35 - 2.19:1 (Porsche code "D")
13:29 - 2.23:1 (Porsche code "CA")
15:36 - 2.40:1 (Porsche code "C")
12:29 - 2.42:1 (Porsche code "C")
14:37 - 2.64:1 (Porsche code "B")
12:34 - 2.83:1 (Porsche code "AA")
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91130290300
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Fits:
Porsche 911 - 1965 to 1971
For 901 gearbox
Available with different gear ratios - example - 20:31 (number of teeth on each gear) - 1.55:1 (gear ratio)
20:31 - 1.55:1 (Porsche code "I")
20:32 - 1.60:1 (Porsche code "HA")
19:31 - 1.63:1 (Porsche code "HB")
19:32 - 1.68:1 (Porsche code "H")
19:33 - 1.74:1
17:30 - 1.77:1 (Porsche code "GB")
18:32 - 1.78:1 (Porsche code "GA")
18:33 - 1.83:1 (Porsche code "G")
18:34 - 1.89:1 (Porsche code "F")
17:34 - 2.00:1 (Porsche code "E")
16:35 - 2.19:1 (Porsche code "D")
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91130290400
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Fits:
Porsche 911 - 1965 to 1971
For 901 gearbox
Available with different gear ratios - example - 25:26 (number of teeth on each gear) - 1.04:1 (gear ratio)
25:26 - 1.04:1
24:27 - 1.13:1 (Porsche code "Q")
23:27 - 1.17:1 (Porsche code "P")
23:28 - 1.22:1 (Porsche code "O")
23:29 - 1.26:1 (Porsche code "N")
22:29 - 1.32:1 (Porsche code "M")
22:30 - 1.36:1 (Porsche code "L")
21:29 - 1.38:1 (Porsche code "LA")
21:30 - 1.43:1 (Porsche code "K")
21:31 - 1.48:1 (Porsche code "J")
20:31 - 1.55:1 (Porsche code "I")
20:32 - 1.60:1 (Porsche code "HA")
19:31 - 1.63:1 (Porsche code "T")
19:32 - 1.68:1 (Porsche code "H")
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90130290910
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
This gear set fits inside the 901 gearbox on Porsche 911 models. It is installed within the internal transmission gear train for the 4th and 5th gear positions according to the factory gearbox layout.
Fits:
Porsche 911 - 1965 to 1971
For 901 gearbox
Available with different gear ratios - example - 31:22 (number of teeth on each gear) - 0.71:1 (gear ratio)
31:22 - 0.71:1 (Porsche code "ZD")
29:22 - 0.76:1 (Porsche code "ZA")
29:23 - 0.79:1 (Porsche code "Z")
28:23 - 0.82:1 (Porsche code "Y")
28:24 - 0.86:1 (Porsche code "X")
27:24 - 0.89:1 (Porsche code "W")
27:25 - 0.93:1 (Porsche code "V")
26:25 - 0.96:1 (Porsche code "U")
26:26 - 1.00:1 (Porsche code "T")
25:26 - 1.04:1 (Porsche code "S")
25:27 - 1.08:1 (Porsche code "R")
24:27 - 1.13:1 (Porsche code "Q")
23:27 - 1.17:1 (Porsche code "P")
23:28 - 1.22:1 (Porsche code "O")
23:29 - 1.26:1 (Porsche code "N")
22:29 - 1.32:1 (Porsche code "M")
22:30 - 1.36:1
Diagram ref no 4 and 5
The 4th and 5th gear set forms part of the internal gear train inside the 901 gearbox. These gears transfer engine power through the transmission at higher road speeds, supporting smooth cruising, correct gear ratios, and reliable power delivery.
Functions
• Replaces the 4th and 5th gears in the 901 gearbox
• Supports correct transmission gear ratio operation
• Helps restore smooth higher-gear driving performance
• Transfers engine power through the gearbox
• Replaces worn, noisy, chipped, or damaged original gears
• Suitable for gearbox rebuilds and transmission restoration
• OE Match replacement for classic Porsche 901 gearbox repair.
Why Replace This Part?
Gearbox gears can wear, chip, pit, become noisy, or suffer tooth damage due to age, high mileage, poor lubrication, previous gearbox wear, or hard use. Worn 4th or 5th gears may cause whining, vibration, poor engagement, metal debris in the oil, or reduced transmission reliability. Replacing the gear set during gearbox overhaul helps restore correct operation and protects related transmission components.
When to Replace This Part
• 4th or 5th gear is noisy, worn, chipped, or damaged
• Gearbox whine or vibration is present in higher gears
• Metal particles or gear debris are found in the gearbox oil
• The gearbox is being rebuilt or inspected
• Gear ratios are being restored to original specification
• Related synchro parts, bearings, or shafts are being replaced
• The vehicle is undergoing Porsche 911 transmission restoration
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90130291310
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Fits:
Porsche 911 - 1965 to 1971
For 901 gearbox
Mainshaft only, no gears attached.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90430210100
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Fits:
Porsche 911 - 1965 to 1971
Porsche 914 - 1970 to 1976
Please note:
This part is on special order terms and is made to order that could take 6-8+ weeks.
It is not a subject to cancellation or return if not required.
Available with different gear ratios - example - 9:31 (number of teeth on each gear) - 3.44:1 (gear ratio)
9:31 - 3.44:1
8:31 - 3.88:1
8:35 - 4.38:1
7:31 - 4.43:1
6:32 - 5.33:1
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90130290102
The product you are viewing cross references to these numbers
OEMatch Gearbox Gears, Crown Wheel & Pinion — Engagement, Smoothness, Control
OEMatch supplies gearbox gears, crown wheel and pinion for Porsche models. These precision-cut components are offered as direct-fit replacements engineered to match original-spec dimensions and tolerances, providing a practical option when genuine parts are unavailable. They are suitable for restoration, gearbox rebuilds and upgraded applications where attention to ratio and durability is required.
Available Types- Standard-ratio gearbox gears for road use
- Performance-ratio gears for modified engines and track use
- Crown wheel and pinion sets for differential rebuilds
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original gearbox gears and crown wheel & pinion.
OE (Original Equipment) refers to parts matching original specifications for the gearbox gears and crown wheel & pinion and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM gearbox gears and crown wheel & pinion engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
These components are typically cut from case-hardened steel, finished with precision machining and balanced to control noise and wear. Correct tooth form, surface treatment and hardness are key to long service life and smooth torque transfer, and selection should reflect the vehicle’s intended use.
- Restores quiet, efficient gearbox and differential operation
- Reduces gear noise and backlash when fitted correctly
- Improves torque delivery and throttle response in rebuilt gearboxes
- Contaminated or degraded gearbox oil leading to accelerated wear
- Pitting and scoring from overload or insufficient lubrication
- Misalignment caused by worn bearings or damaged housings
- Heat distortion from sustained high-load or track use
- Incorrect installation or backlash setting errors
Replacing worn or damaged gearbox gears, crown wheels and pinions restores drivetrain precision and helps maintain consistent power delivery in Porsche models. Fitted parts correct gear engagement, reduce stress on bearings and shafts and support long-term reliability after a rebuild. OEMatch items are selected to align with Porsche specifications and to assist technicians and restorers in matching ratios and installation requirements.
Advantages- Available in standard and performance ratio options for restoration or upgrade projects
- Manufactured and finished to control noise and minimise wear
- Supplied with information to support correct installation and setup
Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. If you are unsure about setup, bearing condition or backlash settings, consult a specialist with Porsche experience.