Here's a breakdown of the process and possibilities:
1. Identifying the Original Transmission (if known):
* Check the original documentation: If you have any build sheets or previous service records, that would be ideal.
* Examine the transmission (if still present): Look for casting numbers on the transmission case. This will help determine the exact model. Common possibilities for a '69 F-100 with a 302 included the Toploader (various versions) and possibly a three-speed.
2. Understanding the Bellhousing:
The bellhousing is the crucial part connecting the engine to the transmission. The 302 in a '69 F-100 likely used a specific bellhousing pattern. You MUST know this pattern to select a compatible transmission. This often involves measuring the bolt circle diameter and the number of bolts.
3. Possible Manual Transmission Options (requiring matching bellhousing):
* Toploader (Ford): This is a strong possibility if it was a factory option. Various versions existed, so matching the case and input shaft is critical. Used Toploaders are readily available.
* T-5 (Ford): A popular swap due to its robust design and availability. However, you will likely need an adapter bellhousing or a custom bellhousing to mate it to the 302's bellhousing pattern.
* Tremec TKO (or other Tremec): Similar to the T-5, these are excellent transmissions, but will almost certainly require an adapter or custom bellhousing.
* Other aftermarket options: Many other aftermarket manufacturers produce manual transmissions, but you'll need to research compatibility thoroughly for your specific engine/bellhousing combination.
4. Clutch System:
The clutch system needs to be compatible with both the transmission and the flywheel. You might need a new clutch, pressure plate, throw-out bearing, and potentially a flywheel depending on the chosen transmission.
In short: You can't just pick any manual transmission. You must determine the original bellhousing pattern (or the pattern of the bellhousing you intend to use) and then find a transmission with a matching bellhousing. This may involve an adapter, which adds complexity and cost. Consulting a Ford parts specialist or a transmission shop experienced in classic truck restorations is highly recommended. They can help you identify the correct bellhousing pattern and the most suitable transmission for your needs and budget.
