Gruman Olson Kubvan

I have a 1992 Gruman step van noone here can get it repaired Problem is that it kicks out of over drive (4th ) real erasy I can hardly get over 80 Kms out of it Now they are telling me thayt it is not made for hiway driving and it is not made for over 80kms per hour
Can some one fill me in on this

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