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My research indicates no visual differences between th400 and th475 other than the tag. They are used mostly in big box trucks and step vans, same as the 4bt, so its possible they already have th475's behind them.

That's about the only difference, straight cut gears to reduce thrust loading in heavy vehicle applications. The cases are usually beefed up in all the same places that 4x4 cases are.

That is actually a TH475

Finishing up the last few bits on the conversion. Starting with the drilling and tapping. Only one hole lined up so I drilled and tapped that one first. 10x1.5mm Tightened that one finger tight and lined up the cover then clamped it in place. I then used a small socket to center my pilot holes...

After many sleepless nights searching the internet I think I have found out what it takes to convert a 2wd TH400 trans for use in a 4wd behind a 6.2 diesel. I will document the process that I am using over the next few days. The best 2wd case to use is one that has the bosses for the bolt on...