The tranny in that truck would be an AOD.
In late '88 Ford came out with the E4OD, but it was only found, to the best of my recollection, behind 5.8/351Ws in F150s. I think Ford put the E4OD behind 4.9s, 5.0s, 5.8s, 7.5s and 7.3 diesels in F-250s & F-350s of that era, as an option to the C6. I think in '89 or '90 Ford started putting E4ODs behind 302s/5.0s and 4.9s, as an option (trailering package/heavy duty package) in F150s.
The "old" hydraulic AOD will have a P-R-N-D-2-1 pattern. "D" is 3rd and 4th gear...the tranny will decide which gear it wants to be in dependent on the speed of the vehicle/output shaft speed. When I say the tranny will "decide", do not infer that there's anything electronic in an AOD tranny or a computer..it's a completely hydraulicly controlled unit. Unlike the GM 200-4R or 700R4, though, there's no shifter provision on an AOD to choose "OD" or "D". The tranny, when in "D" will go 1-2-3-4(overdrive) as I stated, dependent on vehicle speed and how much the accelerator is depressed, via the TV (throttle valve) cable that runs from the engine's carburetor/throttle body to the transmission's valve body. If you want some more info, please feel free to PM me. I've run off on a tangent long enough.
In roughly late '92, Ford ceased production of the AOD in favor of the AOD-E. An AOD-E is very similar in appearance, externally, and shares a lot of the same internal hard parts (drums, gear sets, etc.) with an AOD, but is an electronically controlled unit. A lot of folks who are accustomed to telling an E4OD apart from an AOD in an F150 by the "button on the dash/at the end of the gear shifter to turn off overdrive" might mislabel the transmission in the particular truck if that's all they know. In Broncos and F150s, behind 4.9/300 inline 6s and 5.0/302 V8s, starting roughly in '93, Ford put AOD-Es behind those engines. They have the same shift pattern on the dash (as does the E4OD)...P-R-N-D-2-1...but with this button to turn O/D on and off, you can put the truck in "D" and select whether you want the tranny to go into overdrive or not. If you get in a '93+ F150 and aren't sure what tranny is in it, just look under the truck and look at the size of the tranny pan. An E4OD is a large transmission with a HUGE pan that has a unique "shape"...you can find photos online to give you a reference. An AOD-E has a pan that is, basically, rectangular.
Ford redesignated these transmissions to 4R70 (AOD-E) and 4R100 (E4OD) in the mid '90s.
As another tidbit of b.s., Ford also made a 4R70W, which is, basically the same tranny as an AOD-E/4R70, but the "W" at the end of that tranny's designation stands for "wide ratio." The 4R70W is/was found only, from the factory, in '94+ Mustangs and '93+ Lincoln Mark VIIIs, to the best of my recollection. The "wide ratio" designation is because instead of having a first and second gear ratio like the AOD/AOD-E/4R70, which are 2.40:1 and 1.47:1, respectively, the 4R70W has 1st and 2nd gear ratios of 2.84:1 and 1.55:1. A lot of Ford Mustang shops/gurus will rebuild AODs (for the older Fox-body '79-'93 cars which never came with the AOD-E/4R70/4R70W transmissions) with the 4R70W gearsets, as the deeper 1st and 2nd gears helps in acceleration.