I just purchased an 86 S10 with a 69 350 corvette engine, supposedly makes about 300 hp, and its buckled to a 350 turbo hydromatic tranny. The problem is at around 60 mph it runs approx 2800 to 3000 rpm. This would be awesome at the track but I want to drive mine on the street too. The 350TH seems to need another gear. I want to swap the 350TH for a 700R4. I know I need to get one out of another 350 V8, but a friend told me that all 700R4s had to have a computer or ECM to make them shift properly. Is this true? If so, do they make some kind of adapter or module because there are no more computer parts in my 86.