Are they decent trannies?
How are they for size?
My buddy has a rebuilt 47RE in his 98, i think the trans has like 7k miles on it or something, it doesn't shift right and has some issues. when he gets it fixed i can let you know what he did. It's the biggest issue with the truck.
I'm not sure about size. the 46RE is longer and heavier than a 700r4. the 700r4 is something like 30" long i believe.
In general, stock chrysler transmissions aren't the best. There are companies making good ones, like Goerend and some others.
Personally? I'd avoid them. Well, I did avoid them. I had electronics issues with the 42RE in my Grand Cherokee too, seems to be the most common problem. They are hit or miss really though.
The RH models seem to be better. I considered the 47RH, but since i had the chevy adapter, the GM trans made more sense at the time.