i seem to only have 2nd and 3rd gear in my trans, if i shut the car off and start it back up i will have 1st gear for 1 shift then its out i have to shift it like its a manuel valve body, so i replaced the tranny with a brand new tranny and still the same problem i am lost i also changed the computer and stall, also the speedo reads it seems like a little more than twice what it should be reading, and me and my trans guy are really confused somebody please help me out here and let me know what could be or is the problem thanks its a 94 trans am, thanks Shaun

 

checked all wires and grounds that we could thinkof we've checked online and nothing seems to help us out the only thing we could think of possibly is the vcm or something of that nature

 

What stall are you running and does it do this every time you drive or just under hard launches???

The tranny will go into a limp home mode if there are problems and when it does it only gives you 3rd gear, when you come to a stop and accelerate it normally feels like you are seriously slipping the clutch in a manual tranny car...

Since you state the speedo is reading higher then it should you might have something up with the computer or tune, maybe it is tuned for different gears? But this could mess up when it is supposed to shift and throws it into the limp mode. This also happens (except the spedo part) with high stall cars running an OBD1 computer, but this normally shows itself on hard acceleration or a hard launch...