Fluid change

[GetMore]

The only times I've heard of where changing fluid caused problems was when the fluid was over 100,000 miles old and the new fluid cleaned out the gunk and/or varnish the old fluid was leaving alone.
If you change the fluid regularly you should be fine. I don't expect any problems with doing a flush on your Tahoe.

Doing a flush is really the best way to go anyway. Just draining the fluid in the pan won't do much for you.

I don't think you should bother with synthetic fluid. Just have the transmission flushed every 30,000 miles or so, with regular fluid, and you should be fine.

I had asked Bowtie Overdrives about using synthetic in their transmissions, and they recommend using regular fluid and changing it periodically.