Gears & Axles - gears and pcm

my car curently has 2.73 gears. if i were to put in some 3.73's will i need to get a tune in order for the A4 to shift properly or will just the speedo be off.

yes, you will need a tune

For it to be adjusted to its best, you'll need a tune. If you want it close, you can use a handheld programmer. The gear swap will throw off both your trans and speedo. Both will need to be adjusted. When I went from 2.73 to 3.73 in my 'bird, I used my HPPIII to set it temporarily. Later on I had the car tuned and couldn't be happier. If you go the handheld route first, make sure to remove that tune BEFORE having a custom tune done.

ok thanx

For it to be adjusted to its best, you'll need a tune. If you want it close, you can use a handheld programmer. The gear swap will throw off both your trans and speedo. Both will need to be adjusted. When I went from 2.73 to 3.73 in my 'bird, I used my HPPIII to set it temporarily. Later on I had the car tuned and couldn't be happier. If you go the handheld route first, make sure to remove that tune BEFORE having a custom tune done.
Are you saying a custom tune for a gear change is better than a regular power programmer? What can they do better with a custom tune to remedy shift points than a power programmer? I remember I put a 3.73 gear in my 1994 z28 which had a 2.73 to start. The car wouldn't even shift at full throttle. I then got a Hypertech programmer and programmed my car's computer. The car shifted nice at full throttle. But under normal acceleration, my car's shift points were way off and the car shifted like shit. Ultimately I ended up frying to transmissions. I hope when I put my 3.73's in my '02 WS6 auto and get a professional tune it will shift normal.

Tuning the trans shift points can make the car more fun to drive and more to your liking. A hand held can not adjust the part throttle shift points nor the TCC apply/release times. So you get more satisfying results from a tune.