Transmission Question

[tah0e02]

I just bought a 2002 tahoe with 70k miles on it and i know it needs the transmission oil changed so i was looking toward going with a local shop to do it, Ive found a shop that wants to suck all the transmision fluid out of it and put new fluid in. Is that good to do ? Or should i just find a shop that drains it and fills it ?

 

[STREETutilityVEHICLE]

i like the suck and re-fill method i've used it on a few of my rides, and i'm about to do it to the tahoe

 

[tah0e02]

The thing that sounded wierd to me was that they wont change the filter, I was told by oil can henry's that chevrolet trucks use a diff dexron 6.