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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.
 

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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.
 

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it should have 3.00, check the dataplate on the door..top line, next to last number should be a 1 for the 3.00, or 6 for a 2.80, letters A or F would be for Equa-Lock..

these combinations with a T5 would give it a real tall gearing, like

with the 3.00 at 2000rpm and a .75 od T5 and 25 inch tire gives 66 mph
 

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Yeah, most likely 2.80 or 3.00 if it's stock.

btw, thinking 3.73 maybe a little too much for a daily. First gear will be wasted for the streets. A 3.55 maybe better.
 
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