3.89's or 4.10's better for 18" wheels?

if you get the same tire height as the stock the rim size wont matter. its just the weight that you have to think about. with an aod most people say for for the 4.10s

Never heard of 389's...you probably mean 390's...

410's would give you a bit better acceleration...but I would keep the 373's...it is a good all around good gear to have...

theres a formula for determining the tire height...im not sure what it is...but the 255 is gonna be wider...i dont know how much taller it will be though

http://www.novak-adapt.com/knowledge/gearing.htm that site has a tire conversion thing in it. the 255-40-r18 will only be 0.4 inches taller than the 225-60-r15. so i dont think you have anything to worry about

AOD-Get the 4.10s.

5 speed-GET THE 4.10s!


It's like they said above, if you have a stock sized diameter rim/tire package, it doesnt matter what your rim size is if it equals out as the same as a stock package then you'll get the typical results of each gear.

So lets say your 18s end up being a little taller than the typical stock size combo. This means that you're actually going to feel a slight LOSS in gear, because the larger tires require more distance to make one complete revolution, which sort of evens out the gear ration. If you ended up with a smaller than stock size combo, such as a 15/R50 setup like i have, then you'll feel a GAIN in gear, which is why my 4.10s almost feel like a 4.30.

If you had 3.90s and a short tire, it would feel more like a 4.10
If you had 3.73s and a tall tire, it would feel more like a 3.55


Make sense? I say get the taller tires/rims to fill those wheel wells, then get the 4.10s.