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Hi. I happened to have owned an '83 240, and also still have an '84, and these two model-years happen to span the transition, so I can document with certainty (based on each's owner's manuals) that up to '83, you need type F, while from '84 on, you need Dexron (whatever is the current iteration, III or IV or whatever).
By the way, if I can offer, the proper level is quite tricky, much more so than many on this list believe. You know, of course, that the dipstick has two scales, for two temperatures (40 and 90 deg. Centigrade/Celsius). Let me offer that you would be very surprised at the fluid's actual temperature -- viz., what it takes to reach these? For example, driving around for half an hour in mid 90's (Fahrenheit, that is), like we have now in the East, only manages to bring my tranny's temperature up to about 65 to 70 Centigrade -- I'll tell you how I know below -- so I suggest you interpolate between the two scales unless you've been doing some mountain driving. In fact, during the winter, I'm lucky to see the fluid temperature reach 40 to 50 deg C. ever! A lot of folks think that their tranny is "warmed up" in a little bit of driving -- not true!
And as to how I know, I've used an intra-red (a.k.a., remote scanning) thermometer -- the Raytek model that IPD sells -- by reaching under the car and putting the unit right up against the bottom of the tranny's sump pan. You can't get more accurate than that!
So don't assume that you have to use the 90 deg scale.
Good luck.
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