Turbo 400 or SM465?

[Mattchu60]

Have been reading a lot about SM 465 swaps lately. I really like durable stuff and both the Turbo 400 and SM465 are very durable transmissions. Thought I would see what people think about the two trans and the pros/cons of each as I may swap my 700r4 out in the future for one of these - I don't seem my 700r4 surviving forever as I pull loads with it a lot and also have a 355 which is making more than the factory hp in front of it - someday I'm going to need to either have it rebuilt or replaced.

SM465 seems like the most "fun" choice - I know they are slow shifting - I don't drag race anyways. But there is something fun about just going through gears.

The TH400 seems like the easiest route - and if you do get on it, it would probably reach 60 mph faster than the manual would. Plus they can be built to take a lot of abuse.

What are thoughts on the two? My thoughts are the SM465 would be neat to have, and also it would probably have better mileage than the Th400 since there is less power/rpm loss through the trans.