Thread: Gear ratio question

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If you have 350 HP and a 700R4, I would use the 3.73 gears. The 3.06 first gear in the R4 gives you plenty of boot off the line, and the 0.70 overdrive is essentially the equivalent of 2.75 gears on the top end. Besides, that full-fendered '46 is a bit heavy. Besides, if you used the 2.75's and the R4, you'd have the equivalent of a 1.9 rear gear. That would be hard to pull. Final note - make SURE or double SURE the R4 is adequately cooled. That means a heat exchanger tank in the radiator and an external cooler. It's also best if the R4 is wired to make sure that the converter locks up in overdrive and the lockup releases with the application of the brakes. R4's build heat quickly in overdrive if not locked. You can find a kit a Jegs or Summit - or about anywhere else. I installed a switch on min so I can lock up in any gear.

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