Just sharing my experience for those interested.

I know I'll never be sure of work performed by others, be it a shop or a trade school. I know I have dropped the ball before too.

Since my initial post, my transmission slipped while mildly accelerating on flat ground from ~25mph (I am at full GVWR & ~17k miles).

I promptly took my foot off the accelerator and turned OD Off, the transmission caught and away I went.

Now I'm troubled that my transmission is failing.

I stopped at a shop and we both figured that the transmission might be down a quart as the dip-stick 'pill' is hard to read and we were not certain that the wetness was actual level or residual from the tube. (Granted transmissions don't consume fluid and there were no signs of leakage.) Unfortunately a quart of Mercon V was poured into the transmission as that's all he had.

Now I'm concerned about the harm that the Mercon V fluid will cause to the transmission for Ford says Not to mix either Mercon III or V with the specified Mercon SP.

I go to the Milford Ford dealership, they said it would be two weeks before they could get the van in to check for codes and to flush the transmission as they really can't handle large body trucks (only one bay with a capable lift). They recommend that I make an appointment with the Heavy Ford truck dealership over by the Pilot center in Milford.

The place by Pilot got me in after a week's wait.

I was all set to change over to AMS Oil, just because, and had AMS Oil placards on the both Transmission's dipstick & oil pan.

I told the service writer that I had eight gallons sitting in the cab and that the transmission only takes 3 & 3/4 gallons so there should be enough for the flush, and to let me know if a code was set by the transmission as I had no indications of any code while driving.

Since I work evening shift, I took a nap.

I go for a walk to stretch my legs and see my vehicle is still in the bay being serviced and the tech invites me in.

There I see a couple cases of Mercon SP around my van so I had to ask why he wasn't curious about all the AMS Oil placards and the ATF fluid in the cab of my van. Wasn't typed into the work order to use the owner supplied fluid was his responce.

I asked what code, if any was set, and he said no codes were set.

I'm thinking okie, no code = no warrantee claim, and my AMS Oil ATF is still in the cab.

I talk to the service writer about the AMS Oil omission and then discover that they can't flush my transmission because their machine is full of Mercon V ATF. Why they wouldn't break a fitting and purge while filling, he could not answer.

The service writer responds that yes then there is still some diluted Mercon V ATF that was in the torque converter.

I said to the service writer that I was going for a short walk and since no code was found I can't expect warrantee to cover this.

When I came back the service writer said all was no-charge, I thanked him.

I'm inclined to give the place by Pilot more business, I'll just have to be more inquisitive and ensure I read the final write-up very carefully.

My only continuing concern is the effects of the small amount of Mercon V that remains in my transmission?