I know that, guys. I tried to get a 3:70, at one time. Couldn't find one. I ended up getting a 3:73 from Summit. Glad I did. Like Dean said the 3;73 had a different tooth configuration, than the 3:70. It is much quitier and smoother, than the 3:70, I used to have in my 64. I still have the 3:73 in my car now.