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Help with sequential trans gear ratios

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steveespo

Lord knows I'm a Voodoo Child
Moderator
4,008
1,924
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.
 
741
1,075
TX
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.
 
741
1,075
TX
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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