I hear ya man. So your car is turning into a race car having a trailer for it. Unfortunately I am running with an 8-1/4 and having a shop install it. This is why I am making a big deal about it.
Ohh, yeah that's a bit more of a pickle I get it now. Much harder to change your mind with an 8 1/4" even if you can do it yourself. I know for damn sure though, even if 3.55s aren't quite enough they will make a MASSIVE difference going from 2.71s. I bet even 3.23s would make it run a lot better.
I tried 4.10s in my Duster once, I didn't like it. All the car could do was launch hard in a straight line and cruise around town. I didn't even have the balls to rev it up high enough to keep up with 65 mph traffic because it was already screaming at 4000 RPM; I just held the RPMs there and let everyone pass me. It sucked. My engine didn't seem to need them either it already had massive low-end torque and I shifted at only 5500 RPM. BUT that is a very different combo than it sounds like with your 340 so take that with a grain of salt. Still even if the engine can handle it cruising at 4000 RPM sucks!
