are there two different trans in zr-1's

[zr-1assassin]

guys, i just had a gm mechanic (there corvette guy) mechanic tell me there were two different transmissions put in the zr-1! i of-course told him he was crazy. am i wrong??? one was a t-10 and the other was a t-6 or something??? he said some where 6-speeds and the others were 5 speeds with overdrive! help me out on this if you have heard about this please