One big motivation is, not to lose against a Corvette on a 55mph to whatever pull on the highway -or at the track on the long straights. The Corvette's have a gearing (and weight) advantage. I think they're 3.42 stock. The Viper relies on monster torque to turn the ugly 3.07 gears. If you give the Viper more mechanical advantage with improved gearing -look out!viper is drag limited, only base hardtop would be affected, I think... I was just curious what possible motivation people could have to go with shorter gears on a high torque, (relatively) low revving motor. BTW, where are you in nor cal? I am in Sacramento.
LOL, I have one of these too. Used to have a C6 Z06 as well, I am pretty sure Z06 would give the viper run for the money. You are correct, manual C6 has 3.42 rear end. However, what really matters is the final drive ratio. Vettes with handling package have shorter gears, just as do the ZR1, GS and Z06. As an owner of a base manual with suspension package, I can assure you that you cannot put the power to the ground without fishtailing, using stock size run flats. It took me Z06 size rubber on 19/20 inch rims to finally put the measly 436 hp to some constructive use. Given the hp of viper, this new rear end may just do the same to a viper? Viper is already at the max size of tires currently available, race compounds do not last long on the street. Anyway, I was just wondering why would anyone do this to a street viper.One big motivation is, not to lose against a Corvette on a 55mph to whatever pull on the highway -or at the track on the long straights. The Corvette's have a gearing (and weight) advantage. I think they're 3.42 stock. The Viper relies on monster torque to turn the ugly 3.07 gears. If you give the Viper more mechanical advantage with improved gearing -look out!
I have a base C6 for a daily driver, and it's amazing how fast these things are. Also the C6 Z06 is very close to the Viper (gen III anyway) -blasting on the long straight, pretty much even all the way. Any gap, gained or lost, seems to occur when either car shifts. I can always gain ground at the end though by late braking. And any up-hill sections of the track, the Viper's torque is unbeatable. -even with the ugly 3.07 gears.
Okay, it appears this thread has run its course and, as all lengthy threads must do, has degraded into a Viper vs. Vette discussion. Oh well...
I'll wrap things up with a couple notes on my first drive, which I was finally able to do this morning. In a nutshell -- I'm pleased! If the rear end is making any noise, I can't hear it. It's a pleasure starting out in first gear (was easy with 3.07; now it's even easier) and it's turning a reasonable 1500 rpm at 70 mph in 6th gear. I won't be able to really comment on the fun-factor of it for a while; Unitrax was very explicit about the need to break in the new gears for 500 miles with no high-torque moments or "exhibitions of speed". But I'm confident that I will enjoy this new setup.
As far as the overall build experience, I had a blast. Did I save any money? Probably not, given my tool expenditures, but I like having tools and I'm sure I'll get more good use out of many. Did I save any time? Certainly not. Would I do it again? Absolutely! It was fascinating to me to dig into a rear end and appreciate the engineering that has gone into them and the details that make them work as well as they do.
Thanks to all who have chimed in with both help (Allan!) and all the positive comments along the way. I'm happy to have had the chance to give a bit back to this amazing group of owner / drivers -- I love this forum!
I think that for a street driven Viper, the gear swap will make the car a lot more entertaining. Also more apt to bite. As it's been said "the poor man's supercharger". For the roadcourse, the 3.07 is the prefered gear for most though. The acceleration may not be quite as good, but you don't have to shift as much. Every time you have to shift you lose a little by having to lift throttle and the car is just coasting for a little bit. I've gotten my lap times down by running in a higher gear, less shifting, carrying higher corner speed, and being able to stay in the throttle more. ..............3.07 for me.
I've finally got all my parts needed to do the same swap. The only thing I don't have is the case spreader that you built. Did you find that it was necessary, or was there no problem slipping the diff in/out without it?
I have some time off next week, might dig into it. I bought a spare diff housing to build, going to keep my factory one as-is. Installing the Wavetrac, 3.33 gears, etc..