Now I'm gun shy as to what's next
the saying go,s glass half full or half empty
So we,ll putter on
I,m going to drive it for 2 days and see if there,s any bugs or leaks need fixing, but so far so good
We're taking it back on Monday first thing for a look see and after that hopefully
Very interesting post if I may say so ,,, and this is where I may have failed
A model year 2000 Ford Superduty diesel can indeed have higher than normal transmission fluid temperatures as equipped from the factory, due to the fact that this model year had no oil to water transmission fluid cooler installed.
As explained by a Ford transmission engineer at the time (also a member here on the forums), it was (mistakenly) assumed that the oil to air cooler would be sufficient, and it was desired to avoid adding the heat from the transmission fluid to the engine coolant.
The plan did not work out. By 2001, and for every model year since, the diesel Superduties were once again fitted with both an oil to air and an oil to water transmission fluid cooler.
Furthermore, Ford issued a TSB for the 99-2000 model year diesel trucks that only had the oil to air cooler to have the radiators replaced with new radiators that contained an oil to water cooler, as well as have the existing oil to air cooler replaced if it did not meet a certain flow specification (about a gallon per minute).
So, I would first see whether or not your 2000 model year truck has transmission fluid cooling lines going into and out of the lower tank of the engine coolant radiator prior to leading up to the oil to air cooler.
If not, then I would order the parts from the Ford TSB issued to correct this problem in the 2000 model year, which will include a new radiator and new transmission fluid lines (metal) that are radius bent perfectly and double lap flared with fittings to make a factory installation of the new radiator that has the oil to water transmission cooler.
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