Tranny Flush or Just filter change?

[Tgranber]

I have a 97 GTP with the HD Transmission. 145,000 miles.

My friend works at a shop and they have a tranny flush machine. Should I do the flush from old to new fluid or should I just drop the pan, put in a new filter, and change the gasket?

1. What fluid should I use if I do the full flush?

2. What fluid should I use if I am just dropping the pan and refilling?

3. If I do the full flush, will the new fluid cause slipping due to the fluid not having the metal for friction?

Obvious question number 3 is an opinion.


Thanks,

Tim