All of those 1990’s Pulmor locomotives are built like tanks, with near indestructible drive lines, they lend themselves beautifully to a generous Pittman swap. I have done dozens on top of dozens, …..and dare I say, they’re just as smooth when finished as anything made in this era, ….all of the Hudsons, Mohawks, T1’s, CSS’s, etc, are absolute proven performers when a large Pittman is swapped in. They are geared perfectly, and have very robust parts ….the only limitations are your own budget……Frank’s swap ( the Timko swap ) is perfect for the DIY fella looking to do the project themselves, with no outside help. Many choose to have me install the Pittman, and stop there as they are capable of upgrading their own electronics,….Frank’s swap is a lot easier to install, requiring only hand tools. However, there is a dark side, …the motor is extremely underpowered, and can not even hold a candle to a 9000 series Pittman…..it’s truly comparing apples to oranges,……
Pat 
