00byrd

iTrader: (14)

I have bought a moser 9" with 3:70 gears what would some of you suggest stay with 3:70 gear or go with 4:11 or 4:30 car will see alot of 1/8 mile tracks sometimes a 1/4 track and some street duty. (HOT ROD powertour- other shows) Thanks Mods are in sig....

Racer8102

iTrader: (12)

I think it kind of depends on what size tire you are going to run, 4:10's with a 28" tire and a 3spd maybe, but anything smaller might be a little steep. Look up SUX2BU, he runs a pretty steep gear and a TH350/400, but runs like 31 or 33 in tires on the street to keep the rpm's down.

Pro Stock John

iTrader: (34)

With an A3 you need to run 28's to run 4.10's or bigger, otherwise you'll be doing 4500 down the highway.

I ran 3.50 gears for a long time in my car but I was also making over 700rwhp.

00byrd

iTrader: (14)

I will be running M/T et radial size 275/40/17. So should I just stay with the 3:70 gear?

Scott@DrivelineSolutions

iTrader: (22)

I would say go with a 3.70 ratio for your combination since you have no overdrive. You are still going to be in the rpm's since the stall is high.

slow trap

iTrader: (22)

i'd say keep what you have also. deep cogs and no overdrive sucks !