As already replied before, I think you're making a mistake. The 410's are gonna make 1st gear virtually useless. The higher rpm limit will help make the pace of shifts more to what people are normally used to in terms of shift cadence (I can't tell you how many vids I've watched of people short shifting a 350 just because they're used to the timing of gear runout in other v8's).I have already attempted to post this thread, but I don't think the post was successful. So, here goes with my 2nd attempt to post........
Has anyone swapped out the 3.73 gears to the 4.09's in the gt 350? Were there any issues?
I was told that a different set of gears in conjunction with the flat-plane Voodoo engine wasn't recommended because of possible cabin noise, excessive vibration, and cabin drone. I was told that the engineers jumped through hoops to tune out the resonance, vibration, and drone that is inherent with the flat-plane engine and that 4.09 gears might make the car crazy. And that the inter-cooler differential might not function with the bigger gears.
I would have more pleasure driving my GT 350 if it had the 4.09 gear set. I enjoy inter-city cruising (red light-to-red light) and the sound of down shifts and up shifts. 35 mph is the usual speed limit in city driving. The red-line shift from 1st to 2nd occurs at aprox 60 mph with the 3.73 gears......that's considerable jail residency if caught.
It helps that the 350 has a good overdrive and I'm assuming fuel economy isn't a concern.
But without a solid axle and fat tires to take advantage, I think all you're going to do is create a spin monster where 1st gear either must be skipped or half pedaled/clutch feathered and you'll have to do the same in 2nd to avoid rolling the tires over.
I guess what I'm saying is that unless you're going to improve the suspension/tire, swapping out gears is just going to make an awfully difficult car to drive.