Im going to swap a T-56 into my 98 cobra. I was looking at DDperformance, viper spec T-56 rated to 650 ft/lbs. has anyone bought one of these or can you recommend where to get one built? also with the stock t-45 i see alot of people go with 4.10s or 4.30s. the t-45 has a 3.27 first gear but the T-56 has 2.66 first gear. should i go with 4.56s or 4.88s with the 2.66 first gear?