I cant seem to find my Transmission Vacuum Modulator/Modulator Valve , my lower transmission cooler line came out due to me not putting the right size e clip back on, and it caused tranny fluid to spew everywhere and im thinking its fluid in the modulator because it only blows white smoke at 60 mph and then it doesnt shift down after 3, Hellllppppp🤦

I'm pretty sure your tranny doesn't use a vacuum operated modulator.
So, did you fix the line? Did you fill it with fluid?

Yes i fixed it and put fluid in, about 8 or 9 qts that i had in the trunk then about 2 from another bottle when i went to autozone

Sounds like you drove it until it was no longer able to hold pressure. Need to put a gauge on it and see what the line pressure is doing.

I agree, I think the vacuum modulator went away when they transitioned from the 4T60E to the 4T65E in 1997/1998 .

I have a 4t80e though?

If you can find a vacuum line going to that transmission I'd be very surprised.

Good point. I always forget about the 4T80E.