I have an 87 iroc and already have posi, First of all did that ever come stock on an 86-89 iroc?? Also I would like to still maintain the same comfort on the highway as I do now, but at the same time nocking off alot of time on my ets. I am currently running a 350 tpi with headers, cat back k&n filters and a few other things. I have a 700r4 w/overdrive. I have had different opinions on these gears before. Please help, which gear is the best, and are 3:73's ok with overdrive? also are 3:42's really that much worse then 3.73's? Well lets get a disccussion going here, because I need some advice.