transmission problems

i was driving yesterday and my rpms were sitting at about 3500 when i was going about 65 normally im only at 3000 i just had a flush two months ago. i wasnt ridding it hard or doing anything that could cause damage the truck is a 82' yota pickup. the only thing out of the ordinary is that i just had the calipers and all the brake stuff fixed/ rebuilt just wondering if anyone has any idea whats wrong. while im not red lining it by any means id rather not ride it that high especially if im going to go over then 65

If you just had your brakes done, then you might want to feel the tires after a trip, you could have a brake that isn't raising up, causing drag on that wheel. After a trip the tire would feel hot if this were the problem.

Is your vehicle a manual or automatic?

automatic