1961 Porsche Transmission Part Number: A Complete Guide to Identification and Sourcing

Whether you're restoring a 1961 Porsche 356 or performing a transmission swap, finding the right transmission part number is critical. The wrong number can lead to fitment issues, incorrect gear ratios, or compatibility problems with other drivetrain components. This guide covers the specific part numbers used on 1961 Porsche models, how to locate the number on your transmission, and how to source replacement parts from reputable dealers.

Understanding Porsche Transmission Part Numbers

Porsche used a systematic part numbering scheme for its transmissions, but the format changed over the years. For 1961 models—primarily the 356B—the transmission in question is almost always the Type 741 four-speed manual. The part number typically consists of a seven-digit base number followed by a suffix that indicates variations like gear ratios or final drive.

The 1961 Porsche 356 Transmission

The 356B (produced from 1960 to 1963) used the Type 741 transmission, which succeeded the earlier Type 644. The 741 is a four-speed, fully synchronized unit known for its durability and smooth shifting when maintained properly. For 1961, the transmission case casting number is usually 741.301.101.00 or 741.301.101.01 (the suffix .01 indicates a later revision). However, the complete transmission assembly part number will be different and includes internal components.

Common Transmission Part Numbers for 1961 Models

Below are the key part numbers you're likely to encounter when working on a 1961 Porsche 356. Note that these numbers may vary slightly depending on the exact model (e.g., 356B Coupe, Cabriolet, or Super 90).

Complete Transmission Assemblies

• 741.301.101.00: Original factory complete transmission for 1961 356B (early production).
• 741.301.101.01: Updated version with improved synchros or bearings.
• 741.301.101.03: Another common production variant.

Gear Sets and Differential

• 741.302.011.00: Main shaft (input shaft) for 1961 models.
• 741.302.021.00: Output shaft (pinion shaft).
• 741.302.231.00: 3rd/4th gear syncronizer hub.
• 741.302.411.00: Differential carrier for 1961.

Case and Housing

• 741.301.041.00: Transmission case (casting), left half.
• 741.301.042.00: Transmission case (casting), right half.
• 741.301.211.00: Differential housing.

Shift Mechanism

• 741.301.501.00: Shift rod.
• 741.301.511.00: Shift fork.
• 741.301.521.00: Relay lever.

These numbers are based on factory parts books and are widely recognized by Porsche specialists. Always cross-reference with your specific chassis number and engine type, as some 1961 cars with the optional five-speed (very rare) would have different numbers.

How to Decode the Part Number

Porsche part numbers follow a pattern: XXX.XXX.XXX.XX where each group has meaning:

• First three digits: Model or series. 741 indicates the transmission family.
• Second three digits: Main group (e.g., 301 = transmission assembly, 302 = internal gears and shafts).
• Final three digits: Sub-group and specific part. Odd numbers often denote left-hand parts, even numbers right-hand.
• Suffix (.00, .01, etc.): Design change or material update.

For example, 741.301.101.00 breaks down as:

• 741 = Type 741 transmission
• 301 = Complete transmission group
• 101 = Specific assembly without shift linkage
• .00 = Original version

Knowing this structure helps you identify what a given number represents and whether it's an assembly, a sub-assembly, or an individual component.

How to Locate the Part Number on Your Transmission

The transmission part number is stamped into the case, typically on the left side near the axle flange or on the top of the differential housing. On 1961 356s:

1. Clean the area: Use a degreaser and a wire brush to remove dirt and oil. The stamping is often faint.
2. Look for a flat pad: On the 741 case, there is a machined pad near the speedometer drive (driver's side of car).
3. Check the bellhousing area: Sometimes the number is near the clutch release arm.
4. Use a mirror and light: The stamping can be shallow; direct light from an angle helps read it.
5. Document the number: Write it down exactly, including any letters or dots.

If the number is illegible, you can identify the transmission by its physical characteristics: 741 cases have a distinct shape with a removable side cover ( often called the "pancake" transmission). The 1961 version has a ten-bolt side cover.

Where to Source Replacement Parts

Sourcing correct parts for a 1961 Porsche transmission requires specialists who understand the nuances of early 356 components. Here are reliable options:

• Porsche Classic Center: Porsche's own heritage program stocks many original 356 parts, including transmission components. They can look up numbers by VIN.
• Stoddard: A long-time Porsche restoration parts supplier with a large inventory of NOS and reproduction transmission parts.
• Pelican Parts: Offers many OEM and aftermarket transmission parts for 356 models, with detailed fitment notes.
• Sierra Madre Collection: Specializes in 356 restoration parts, including gear sets and bearings.

When ordering, have your transmission's casting number and your car's chassis number ready. Many parts interchange across model years, but some (like synchros) changed in 1961. Always confirm the part number matches your transmission's needs.

Important: Avoid generic auto parts stores. They will not have correct 356 transmission parts. Stick with Porsche-focused suppliers.

Final Recommendations

1. Verify your number: Before ordering anything, locate and confirm the part number on your actual transmission. Do not rely solely on year or model.
2. Buy complete assemblies if possible: If rebuilding your transmission isn't your goal, consider a rebuilt 741 unit from a specialist like Stoddard or a Porsche Classic Center. These come with a warranty and correct internals.
3. Match gear ratios: 1961 cars had different final drive ratios (4.43:1 or 4.18:1 for Super 90). Make sure your replacement transmits the correct ratio for your driving needs.
4. Keep records: Store your original part numbers and any substitutions in a file. This helps future owners and mechanics.
5. Consider upgrades: Some modern replacement parts (like upgraded syncros or bearings) fit without modification. These can improve reliability without altering originality.

Finding the correct 1961 Porsche transmission part number may take a little detective work, but it's essential for a successful restoration or repair. Use the numbers in this guide as a starting point, verify on your car, and order from reputable suppliers. Your 356 will thank you.