i have the 2.73 gears in my posi drum rear. this is an 87 z28 with 305 lb9 tpi. i was wondering if i should swap gears to 3.73 and what i would need to do it and how hard would it be to switch to disc rear brakes at the same time? i am looking for something to do over the winter and i want to start improving my car now that it is running good (knock on wood).

 

try 3.42s, theyll work out better.

 

why those?

 

well first you need to find out where your peak power is then you need to find out what trap speeds you will be pulling then you can decide on the optimum gear ratio for your car.

 

well im basically stock besides a shift kit (i think), ported plenum, k&ns, and an airfoil. but i am looking to get the car into the mid 13s. i dont know how to go about that in a cheap way but thats what i want to do eventually.

 

3.73's arent very fuel friendly and will rev the engine higher... Give 3.42's a try... right now I am going to be puting in a new Posi disc 3.27's from my old 2.73's drums...

 

i want disc brakes mostly. i dont want my fuel mileage to suffer at all. can i just go up a ratio and put discs in? how good are these 3.27s?

 

I will be putting them on my car soon. I will let ya know.

 

i went to 3.27s from 3.08s my gas mileage is the same if not better. driving like a nut around town i get 16mpg, if i really want i can get around 18 or 19 if i go easy and normal, on the highway ive seen around 30. this is great for a mid 13 sec car no doubt. ill be going to 3.45s for next season and i doubt itll hurt my mileage any and even if it does i got plenty to spare haha.