Steve, the owner of Berg Werks did the math for me yesterday based on the current gear ratio of 3.27 and my man. tran. The car runs the following at 65mph, 3550 in 4th, 2750 in 5th, 2400 in 6th.

He estimates that with the change to 3.69 ratio is a 13% change and will run 2700 +/- in 6th, 3100 +/- in 5th, 3900 +/- in 4th. This will definately keep the car in the power band that we have all felt in the 3500 rpm range.

It will decrease top end by 13%, so if the car hits rev / speed limit at 155 mph in 6th, it will now cut at 138 mph.

This is perfect for the road courses I run the car on. and won't seem to effect my highway driving. The percentage of gearing increase 13% should reflect in the same increase in 0-60 times and 1/4 mile times. Within relative terms...

I am a little concerned that first gear will be extremely short now and will have a shift point somewhere around 12-15 mph. But I would assume I could launch the car in 2nd during normal street driving without buzzing the clutch too much.

PS: total cost for the new diff, gears and install is going to be $3,100. Pricey, yes, but I think it will give me the performance I need in the car.

Based on my conversations with Berg Werks, All standard MB cars are over-geared to help create a much quieter, smoother ride at highway speeds. And to help with gas mileage.

I have ordered the diff. and since it is custom made, I won't see it for 6-8 weeks. Will keep you all posted.