i have a 46 re in a 97 ram 1500 bad would like help with facts about changing to a 46 rh

Just curious as to why you'd want to change it?

already have

any help please

What exacty do you want to know?

i want to know what is the difference from the 46re to the 46rh?

will it work with out a lot of work

The RH has a mechanical governor vs the RE's electronic governor.
Because of the RH mechanical governor it has a longer overdrive and it makes the over all trans longer. Your transfer case should fit. You will have to shorten the rear drive shaft and lengthen the front.
The valve body is different and I don't think it will plug in to your existing wire harness.
I think you will also have fault codes in the PCM when your done that won't go away due to the RH trans missing electronic components.

I wouldn't do it.