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What gear ratio is best

I have 3.73 gears now with a12 liter Detroit, Pittsburg Power overhaul in Dec. 2017. The dyno showed 591 hp to the wheels with power box on setting 4. I have a13 speed over drive transmission. I was thinking of going with 3.36. What would you recommend?

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This really depends on how fast you want to drive. 58-62 with that engine works perfect with 3:73 gears. If you can drive that speed I wouldn't change anything. If you are going to change gears I would go with a 2:64 or 2:79 rear end. 2:64 for 60-65mph or 2:79 for 55-60mph. You will be using 11th gear for your top gear, which will be direct drive on your transmission. If you want to go 70 plus you can run in 12th. Hope this helps.

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Thanks, I think it will be 2.64.

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There's quite a few people who have done the 13spd, 2:64 rears, and series 60. It's a great combination. The idea is to gain more efficiency by running in direct. (11th) then you still have 12th if you sometimes need to go faster. I'm wanting to switch to a setup like this myself. I have the series 60 as well. Keep me posted if you can, looking to do the same thing. Thanks.

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Will do, thanks.

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