175 without converter
This is most likely to be GM's Turbo 400 transmission.
The weight of a 350 GM turbo transmission is about 125 pounds. However, some people claim that they can be as light as 90 pounds.
12 to 14 quarts including the converter 7quarts without
Dexron II or any other transmission fluid for GM vehicles.
That would be a HEAVY DUTY 400 Turbo
Dexron/Mercon III
Turbo hydramatic 400 long tail common to all GM senior models except Chevrolet from 1965 to
The transmission fluid capacity for a GM turbo 200 R4 transmission is 6 quarts. It should be drained and refilled at least once every two years.
Look at the pan, the Turbo 400 pan is 16 5/8-inches long and 13 inches wide - it looks like a map of the state of Texas . - The Turbo 350 pan is like a square with a corner cut off and is 13 1/2 inches long and 13 wide. Read more: How to Identify a Turbo 350 or Turbo 400 Transmission | eHow.com http://www.ehow.com/how_7423514_identify-350-turbo-400-transmission.html#ixzz2DV3H19xj
The transmission with casting number 3901181 is a GM Turbo 400 automatic transmission. It was commonly used in various General Motors vehicles, particularly in the 1960s and 1970s. This transmission is known for its durability and is often sought after for performance applications.
GM never made a 450 tranny, you probably mean a turbo 400 tranny and yes it can be done.
GM synchromesh