Transmission not shifting from second to third it revs up delay shifting

What is your question?

I have a 1990 Ford ranger 4.0 with an A4 LD transmission I just replaced the modulator valve because it was sucking trans fluid to the intake after I put it on and went to test drive it wasn't shifting right it revs up shifting from second to third gear and I don't know how to adjust the modular valve and now I noticed that it feels like I'm pulling a big heavy trailer please help me thank you and have a merry Christmas

How long has your 1990 Ford Ranger had this problem?

A few days