Brian,

I will never bring my car to your shop for a ATF change. I will take it to a place that is more competent or do it myself.

It takes less than a minute to R&R the TC plug and if you remove it first, all the ATF will run out while you service the transmission.

Would you only drain half the oil from the engine on an engine oil change? I bet you don't drain the engine oil cooler either.

Some American manufactures are too cheap to put a drain plug in the transmission pan too.

P E H