I have a 93 s10 4.3 which I believe has a 4l60 tranny. Well I am having a problem starting out in overdrive, But if i put the truck in normal drive it seems to be fine then when im at high rpms in 3rd I can shift into overdrive fine. But If I start in overdrive It seems to slip then not shift just high rev and if it does shift It slams hard into gear. This all started when I put alot of weight in my bed because of all the snow weve been having, And stupid me not thinking I drove around in overdrive the whole time for about a week. My truck is putting off a trouble code 82 which is for shift solenoid 3-4. But the code does not always come on when the problem is happening, Also sometimes I get in truck after its been sitting for a while and It shifts and drives fine.