I was wondering if anyone could help me out with a problem. I had a 302 installed a year ago and the mechanic who installed it kind of messed things up alittle. Right now my truck is high reved and hits high rpms before it shifts. Automatic transmission, and it only does that until I hit overdrive then the motor gets quiet and runs fine. Any ideas would be helpful thanks

What is the year, make, and model? 

is this a new problem, or did it start when the motor swap was done?

it started about 3 weeks ago

it is a 95 f150

 Have you checked the tranny fluid? If so what color is it and does it smell burnt? Does it idle high in nuetral or park? Does it occur when it is hot or cold? Does it occur every time it shifts, or intermidiately? If only every now and then, is there a similar variable that is always present? Is there a difference when the a/c is turned on? Does it do it when you "manually" shift the truck? 

I've checked the fluid and it looks alright, when in park it idles high and it happens cold and hot. Everytime it shifts it does it as well as when i "manually" do it and as for the a/c I dont run it because it doesnt blow cold when the truck is stopped or when i have to accelerate.

When was the last time you had the tranny fluid changed? 

Maybe a year ago was the last time. Altho changing it now might not help esp since it has 166,000 miles on it.