Ive got a 700r4. I do not know much on the history of it. It has a nice firm 1-2 shift at about 20mph. It doesn't seem to want to do the 2-3 shift under load. I haven’t driven it far but I can get up to 45 (is the speedo is correct) and it still doesn’t shift while accelerating. If I let off the throttle it shifts. It seems like I read somewhere it should 2-3 shift around 35 - maybe thats wrong. I have not really tried to accelerate beyond the 45 mark - it seems ( by sound - no tach) its revving high and should have shifted by then. I haven't driven anything with a 700r4 in a long time. Maybe with gearing, tire size (perhaps the speedo is off some) its normal and I need to run it out a little further. Ive done a filter change and its got a corvette servo in it. Id say it shifted about the same with the stock servo. The axles should have 3:73 gears and the tires are About 34” tall. any ideas or suggestions. Thanks.