Butters "Winter Upgrades". . Starting a Little Early

DionR said
I kind of like the 2.73 for the strip, should cross the line at the top of third and save a shift over the 3.08 gear. But the 3.08 would probably be better for autocross assuming it is held in 2nd gear. But I am just guessing on both.

Either way, I think it comes down to what is available. If the 2.73 isn't available then it is kind of a mute point.

My last trap speed was 113 and I have to suspect that's going to change.. It's gonna hit 4th, I'm sure.

If I have to find a set of used 2.73s, it's not that big of a deal.

DionR said
Nice. What about with the 3.27 gear?

As I recall, the issue with the 8HP70 with a deeper gear in the Challengers was the motor redlined too fast for the trans and it hit the rev limiter in 1st. But that might have been with a 3.91 6M gear, too. I don't remember anyone talking like it was shifting too soon driving around normally.

This is my fear.. I'm wondering what can be done with torque management by my tuner

bjkadron said
I think the main problem with deeper gears is going to be traction. The stock 6.4 could already blow tires off a dart, with this new beast I think the higher gearing will help make it more controllable. Just spitballing here. I only have 3 speeds currently and I already know traction will be a huge issue on the autocross.

When I had the 904 in, my 1st gear was a little boggy with 3.27s... I didn't spin a tire at all on launch with street tires and I just held it in first at Moparty. It wasn't the good 904 tho.. and it was wounded.