A few items to address.
1 - All Ford 4R100 automatics use Mercon-V (5)
2 - You can buy Mercon-V fluid at almost any auto parts store or even Wally World. It does not need to be Motorcraft brand.
3 - Your Gulfstream is a 2002 model year but there is a good chance that the chassis under it is 2001. Check the chassis build plate or VIN to know for sure. While it doesn't affect the trans fluid it might be important when obtaining other chassis parts.
4 - It would have been more appropriate to post this question in the Ford Motorhome Chassis Forum.
Not trying to be a jack-wagon, just providing friendly guidance.
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Nick
1995 Coachmen Santara 360MB 36' w/slide.
Ford F53/460 chassis, 2020 Chev Equinox "toad"
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