Thread: Ok time to find out my correct gearing needed for rear end

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Tech - I was running right with you until you added the tires into the quandary.

So if I went to a 700R with my current rear end gears I wound end up with a final rear drive of 1.91:1 in fourth which wouldn't yield enough power to get out of my own way let alone somebody else.

So now, With my 28" tires, I going to have to look to changing out my rear gears from the existing 2.73 to at least a 3.55 to maintain a balance of power and efficiency. Guess I'm going to have to wander on down to the Corvette shop and see if they have the rear gears I need. I got a feeling this ain't going to cheap or painless.

Bob, I seem to remember a thread on this subject from years ago and as well as I can recall, it seems the consensus was in the 3.50 to 3.70 range as a reasonable balance, so you're choice of 3.55 would seem to be right in the ballpark.

The 3.55:1 ratio is very popular in hot rodding and for your application seems about right also. But I think this is a Ford ratio. In 10 bolt rears chevy has 3.42:1 and 3.73:1. I would lean more towards the 3.73:1 with your over-drive.

Kitz