The F transmission is indeed a four-speed Dagenham transmission.

You've got a 1964 model that was assembled in December 1963.

The combination of 170 cui engine and 4.00:1 rear axle ratio means this van was designed to haul stuff around town and not spend too much time on the highway.

You mentioned that it is an 8-door, which means that it has cargo doors on both the left and right sides. That's fairly rare in these vans.

Get the full breakdown of your dataplate info here:

www.econolineid.com

The "IRS" marking you mentioned is really "LBS," which is the total "pounds" that the van and maximum load can weigh. In your case, the van weighs about 2,600 pounds empty, so you can carry a total load of 1,000 pounds (driver, passengers, and cargo) to reach your maximum gross vehicle weight of 3,600 pounds.