I bought the wrong transmission for my 66.

RustyRatRod said
Heck, I wouldda thought the 3.09 low gear wouldda benefitted a slant 6. Are you saying it's too low?

I feel it is. I had a perfectly good 7 1/4 2.9ish gear but was afraid I was going to break it. So installed a 8 3/4 3.55 gear and here I am.