Hey everyone so I'm having a slight issue with my speedometer, and I own the K10 blazer with the 6.2 Detroit I am not sure which trans I haveim pretty sure it is the 400 not the 700r however I have read across the forums that the 6.2 come with the 700r. I have not experienced any issues with the transmission other than it shifting hard from first to second during hard acceleration, the next issue i am having is the speedo bouncing to a settle when I let off the gas. this makes it very interesting to drive and know any sort of a consistent speed, what might be the problem and or a possible fix? Also I will try and post a video when i get a chance.