96 GMC SAVANA 4L60-E trans-drain converter

how can I drain (flush) the converter without removing it

Cannot, you could disconnect a cooler line at the rad. then run say 10 qts thru the trans to flush the conv. and trans, use the cooler in line at the rad. to do this and a way to catch the old fluid.

Cannot, you could disconnect a cooler line at the rad. then run say 10 qts thru the trans to flush the conv. and trans, use the cooler in line at the rad. to do this and a way to catch the old fluid.
That was pretty much what I figured-------was just checking to see if maybe someone knew of a "magic bullet", since GM no longer puts a drain plug on them!!!!