8 3/4 transplant into my 66

Cool thanks for the info.......I am sure it wasn't an 8 3/4. It had bolts holding the rear cover on......... I am not up to speed on the differences between the 7 1/4 and 8 1/4......The 8 3/4 I have now is all installed and converted to the LBP axles.

The 8 1/4" would not have been original equipment in a '66, so you would have had a 7 1/4" unless somebody had swapped one out. And I'm not sure they even made a SBP 8 1/4".