its a 1989 MVP wagon (van)
v6 automatic

the tranny slips bad and screams loud like a squeaky belt,if in drive from a stand still it will excelerate up to about 30 mph, but then it slips and you end up manually down shifting, then it will go again, but theres no way to faster than about 35 mph. I s the transmission trashed completely? can it be saved with adjustments? or a rebuild kit? a replacement is very pricey so...

Thanks