You need the valve body from the lockup unit. The lockup function has its own, separate circuit. The feed line is not found in the standard valve body. When I first did this swap, I confirmed that the case was the same.

My memory is a bit fuzzy, since its been 10 or so years since I did it. The special valve body times the lockup to come in after OD is engaged. Its an extra circuit and the standard body I looked at did not have it.

Also, the factory manual from that era show the circuit, but it was not in the actual non lockup units. Basically, the manual is wrong.

10 + years is a long time. but that's what I remember.