I am trying to figure out what gears are in the rear end. Does anyone know what these came stock with? It was originally a 289 with a 2 barrell. It is now a 351W witha T-5 and I am wondering how to tell what is in there already so I do not replace it with the same gears. This is my daily driver but I want to make it a little beefier. I was thinkg 373 for the gears.
Check you data plate for the answer on what gears you have. As for what to go with. I just swapped 3rd members out of my 66 Fastback form 2.80 open diff to a 3.25 Trak-Loc and what a world of difference. Gets off the line quicker and still stays low in the rpm range like the 2.80s did. Its the perfect daily driver ratio.