We have sold about 5 of these kits, 2 have went to Canada, and the other 3 to USA customers...

They have all been in the cobalt, which the HHR is the same with the F35 trans.

 

And what is the feedback from owners, and how are the cars used? (Daily Drivers, Quarter Mile, Track days, SCCA)?

 

I agree 100% with this statment. When you're running a fast spooling turbo like the factory one in the SS, having shorter gears will give you the illusion your vehicle is quicker given how fast the turbo/motor spools out, but realistically with a little taller gears in succession from 1st to 4th with the F35 trans, it will provide much smoother and more reliable acceleration. GM did in fact do a study with this, I dont remember nor can I find the article to show you guys unfortunately, so I'll leave that as speculation for now, but they found the same issues as I pointed out that the smaller turbo is just too responsive to have access gearing. Not to mention your fuel economy will suffer. Having the shorter gear ratio in city driving will do some damage.

NOW, if you were going to use a lag prone turbo set up like aaronSS had mentioned, then a closer range of gearing is ideal to keep your RPM's and boost pressure in the power band between gear sets.

 

Awesome feed back, and most are drag or track, which all are daily drivers.

 

Under hard acceleration I shifted between 2nd to 3rd and heard a loud boom. When I looked under the car I could see a crack all the way around the bottom of my transmission, and all of the fluid started leaking out all over the ground.