far as i know that 3spd manual in the Elky should be the same 3spd that would have came in your 66 but if yous came with a 4spd you're drive shaft won't work (if its the typical top loader truck granny 4spd) so you might have to find another truck like you 66 (i think 63-66) that had a 3spd and get the entire drive shaft and the crossmember my 64 had the 3spd column shift but i can't remeber how the crossmember was in it, i have all the parts yet but i'm not at home (in minnesota) cause i'm going to school in wisconsin
Nate
