After I get more suspension stuff done I will be adding 373's. What are the down-sides if any to these gears?

 

You'll run out of gear sooner

Gas mileage may be slightly effected, but if you're not keeping a log, you probably won't notice.

Engine will run higher when cruising, and be a bit louder. Rpms at 75 would be approx. 2700 I think.- If you do a lot of high speed cruising, you may actually notice a difference in mileage. If it's mostly around town or on local highways where you really only go 60, I don't think you'll notice.

 

i really noticed a loss in gas milage
i use to go 340 to a tank in my 96 t/a a4 but when i put in my 3.73's i can only get 250, of course i drive 80mph on the highway, and i know that is what hhurts it

 

I sure like mine.

 

Since your car is and auto you will want to invest in a Torque Converter like 2800 or 3000 stall. otherwise cruising will be absolute hell.


john

 

How does the stall compinsate the gears?

 

well, its not really that big of a difference when it comes down to it but you wont have to be idleing at 3500 RPMs when your cruising down the highway at 65 so it does make a little bit of difference.

-john

 

75 = 2500 RPM on the nose. I noticed a huge drop in gas mileage. My friend has stock 2.73 gears in his Z and he gets about 280 to the tank with his A4.. i get maybe a little over 200, with not much freeway driving.

 

you guys fogot traction, that gets pretty hard when you launch if you keep steet tires.

 

You run out of gear really easily with 3.73's on a 26" tire.

 

dang aram you pulled mid 13's with a gtp is that stock? that pretty darn good for a grand prix

 

Try 3.42s....Plenty of bottom end pull with the 3.06 first gear, and plenty of top end. 10 years on mine and my sig has mpg...
--Alan