The chain racks are nice, I have them on my western star, and the one for the pete I had doesn't have them. I actually don't use them on my Western star, every time you start and stop it sounds like the ghost of christmas past with all the chain clanking going on. I've seen guys mount mud flaps to the rack to cut down on the noise.
No brakesaver on the 3406, its pretty rare to see one of those around here. The motor we took out did not have jakes, and I wanted to add them, so finding a motor with them already on was a big plus. I guess they are getting hard to come by used.
Everyone I talk to, tells me to not expect as much jake braking power out of the 3406, as I get out of my 60 series detroit.
Current transmission in the pete is a 13609b 9 speed. I have a 15 speed that I got for my engine repower in the 35 several years ago, that is still laying on the floor of my shop.
I've been debating putting the 15 in the pete, and putting the 9 speed in the 35 when I finnaly repower it. I think I would get a lower 1st gear, and closer steps down low with the 15, and the 9 speed would be 3 inches shorter in the 35, where I'm really going to be hurting for room. I've also thought about a 8LL in the 35 for that really low hole when crawling around on a jobsite, but it would be just as long as the 13.
Both the 9 and the 15 are RTO transmissions, but according to the eaton chart, first gear may be the same in each, the 15 just has closer steps down low. I could stick each trans in first and count revolutions I suppose, but I don't know how that would work with no air on the transmission, if I'm getting low in the deep reduction.