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Help with sequential trans gear ratios

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steveespo

Lord knows I'm a Voodoo Child
Moderator
3,946
1,699
Exp. Type
W2W Racing
Exp. Level
10-20 Years
Cookeville TN
I was thinking I'd be running the 705/710s in the rear which come in around the 27.8 height. Do you recommend the 65/68 heights instead?
The 71 is too tall for the car and will rub the inner fenders unless ride height is 4x4 like. With 68 Michelins and a 3.55 gear I hit 171 at Daytona start finish at 7200 RPM 1:1 5th gear. With the 65s car hits 152 at VIR 5th gear at 6900 RPM. With the 1.13 5th and 1:1 6th in your sequential you could just run 68/680s at either with 3.55, or go 3.31 and run the 65/650s where you need a little more gear. I am jealous, wish we could have an H pattern box with those ratios.
 
The 71 is too tall for the car and will rub the inner fenders unless ride height is 4x4 like. With 68 Michelins and a 3.55 gear I hit 171 at Daytona start finish at 7200 RPM 1:1 5th gear. With the 65s car hits 152 at VIR 5th gear at 6900 RPM. With the 1.13 5th and 1:1 6th in your sequential you could just run 68/680s at either with 3.55, or go 3.31 and run the 65/650s where you need a little more gear. I am jealous, wish we could have an H pattern box with those ratios.
Ahh. This is helpful. I ran the 705s a lot on the factory setup with 19in wheels, so I assumed it would work. But wasn't accounting for how much the coilovers would lower the car. Makes sense. Thanks for sharing. This is great and I really appreciate you catching that.
 
Okie dokie - I took a couple shots and submitted the order. Oof. This one hurt. Cost was $17,220 all inclusive except for driveshaft and clutch. Hopefully going to be worth it.

Ordered the 2.44, 1.80, etc. ratio. Now the wait begins!

I'll post a detailed swap parts list once I finalize and know it works.
 

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