Take it around the block one more time and leave it running on level ground in park and check the fluid again. Is it at the highest mark. If not then add enough to get it there and test again. What color is the fluid and does have an odor? You have to be leaking fluid somewhere. Have you looked under the vehicle?
IS the OD light flashing or as it?
How many miles?
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Then it must of been low. If you cant find a leak anywhere then its not leaking. Hopefully it being low on fluid has not hurt it.
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they would of had to replace the transfer case front seal since there is no seal on the back of the transmission. I do not see how all that transmission fluid could get into the transfer case. The transfer case seal is higher than the fluid leel in the trans.
The only B-12 I know of is B-12 CHEMTOOL carb cleaner.
Thery did not sell you a trans service thus the reason for not serviceing it.
I do recommend you flush it and remove all that mixed up fluid and fill it back up with ford mercon 5