You might get a little more higher flash stall w/the taller gears.
Guys have installed 4L80E trans that has replaced the stock 700R4 in there Syclones & Typhoons & have been very good swap for these vehicles.
There has been direct comparisons back to back with the 4L80E/700R4 swaps, the 4L80E trans did not make any Sy/Ty's any slower, even though the trans are heavier & having a taller first gear did not hurt performance.
Main thing they all gained was reliability. When you have a vehicle weighing in at 3600 LBS Syclone, & 4000 LBS Typhoons, having all wheel drive, boost launching at minimum 360 ft lbs & 600+ ft lbs of torque, this is very hard on stock, & even built 700R4's.
For my Camaro, a turbo application, rear wheel drive, somewhat light, I just do not like the idea of having a 3:06 first gear, fearing it will be way too easy to blow the tires away, that is one reason I choose to use a 4L85E, plus , stock, they can take a lot more power/abuse over a 4L60E/4L65E.
They do make 4L60E taller gear sets, but having a trans like that will be a weak link for my application IMO.
