I have done this several times
The PCM had no idea what year 4r70w you have

Ford upgraded the internal wiring harness on the 4r70w from stranded wires to a Rigid plastic piece that carries all the wires when they did this they reduced the number of wires going in the side of the transmission.
Like I said in 96-97 there are 3 power wires going through the white plug on the side of the trans, in 98-01 there is one wire and then it splits three ways inside.
So we often will update an old 96-97 trans to use the 98-01 solenoid and wiring pack
You simply re pin the big white plug on the side of the trans

I have the diagrams I will upload them, pictures worth 1000 words

My 1988 Bronco II uses a 1997.5 computer because I have the P heads and no pats. I am running a 1997 trans that has been custom built and is using the 98+ style solenoid wiring. So I re pinned the truck side wiring to work with the 98 style internal trans harness
I have done this several times since, in both directions even installing a 97 trans into a 99 truck, working backwards so to speak (customer on a budget)

Typically anytime we rebuild a 4r70w we use the 98+ internal wiring harness and will change the truck side of things to match. This goes along with updating all new solenoids, and tons of upgrades/mods to the factory valve body. 

Here is the pinout info: Notice only one 361 vehicle power feed on the 98-05, otherwise all the same wires

Last edited on Sun Nov 4th, 2018 10:28 am by 410customs