As 'Jay stated, I don't really get on it. The trans is out of a '99 Escalade with a 5.7 Gen I Vortec. Mileage unknown since the dash was taken out of it. I pulled the pan before intalling it and found minimal residue in the pan. The original fluid was red, so I treated it to a new filter and resealed it with a new gasket. I do use it to haul snowmobile trailers and 2 trips a month to the scrap yard. Scrap iron loads in excess of 4000 pounds are not uncommon in this truck since the engine/trans swap.
What this engine has for full throttle starts is still unknown to me. I'm just basically looking for smooth power with some reliability. The weak link in the reliability chain will be the trans. That's why I baby it. It's not a daily driver. Twice to three times a month driving is about tops for this truck.