Which Gears

**shady milkman** · 09-28-2006, 06:59 AM

THANK GOD!!!!..but i should still switch to 3.73..i'm just not sure if i'm gear head ready enough to change it yet

**djvaly** · 10-04-2006, 07:32 AM

I have '99 TA A4, so do I have the 2.73 or 3.23 as stock? would it be in the
user's manual? I doubt it.. please help

**djvaly** · 10-04-2006, 08:08 AM

never mind, I found the answer on a different thread but wanted to share with you anyways.
look at the service parts specification sticker on the door,
"Look at the RPO codes (on the side of the door jamb, or in the glovebox). If you see GU5 that's a 3.23 car and a 3 series carrier. If you see GU2 it is a 2.73 car and a 2 series carrier."

I have a GU5 = 3.23 gear, so I will go with 3.73... any ideas on 1/4 mi time gain? .1, .2?

**mattycakes98TA** · 10-11-2006, 05:28 PM

I have 2.73 would I notice a big difference switching to 3.73 ...in the 0-60 quarter?

**mattycakes98TA** · 10-11-2006, 05:30 PM

..what is the series carrier?

**djvaly** · 10-12-2006, 08:21 PM

for a 3.x gear the series carrier is 3. for 2.x it is 2.

**hiramsuito** · 10-14-2006, 03:28 PM

I want to switch from 2.73 to 3.73 but I've heard that I need some kind of adapter or spacer, is it right?.

In case of needing it, would you guys please recommend me any good brand?

**LS2Tuner** · 10-15-2006, 07:09 PM

Originally Posted by mattycakes98TA

..what is the series carrier?

That is refering to what gear the carrier was originally equiped with........Different thickness ring gears depending on "series carrier".
Now there is SOO MANY manufactures you can get a spacer for the thin gear if needed for your carrier.

3.91's ALL THE WAY!!!!

**djvaly** · 11-07-2006, 08:57 AM

If I have this idea right, a torque converter (stall converter) provides additional torque multiplication equivalent to a higher numerical gear ratio..
so if I were to do 3.73 gears why would I need to do 3000-3200 stall converter? would I do one or the other? please explain.. Thanks!

**LS2Tuner** · 11-07-2006, 05:57 PM

The converter NEEDS to match the cam.........If the cam doesn't start tp make power until 3000rpm a stockl con. that locks up at 1400rpm isn,t going to let the motor "free wheel" to 3000 before it locks up........
When you see a car at the stop light jumping around trying to roll forward while idleing thats because some dumbass has a tight ass stock con. on a big cam.

Gears are only going to help it rpm faster not rev higher before it moves!!!! There fore if you have a stock cam anything over a 2000 isn't going to do shit!!!
Stock cam change gears NOT converter!!!

**djvaly** · 11-07-2006, 09:14 PM

I see, so in other words. I'd do the 3.73 gears first, then get a mild cam and then put in the 3200 street fighter stall.. in that order?..

**LS2Tuner** · 11-08-2006, 05:16 PM

Originally Posted by djvaly

I see, so in other words. I'd do the 3.73 gears first, then get a mild cam and then put in the 3200 street fighter stall.. in that order?..

Yes but don't put a # on the stall until you match it with your cam choice!!!

Also have you done anything in the area of making all he power you have now get to the ground......Such as sub frame connectors or spring changes.....?

**djvaly** · 11-08-2006, 09:19 PM

yep, i got the SFC's in .. and the eibach pro kit

**schrysler** · 11-13-2006, 08:42 AM

would going from 273 to 373 be a pretty drastic difference?

**djvaly** · 11-13-2006, 08:59 AM

a nice change in acceleration I hear, you'd need to tune your car for the new gear, I recommend buying a handheld programmer like Hypertech Prog 3 or such. you get ok tuning out of that, shift points moving etc, plus the gear ratio part. your speedo needs that recalibraton tuning.

PS. I also hear it's worth doing a mild torque converter/stall for the A4.. if u have it as a daily driver, if it's a track car only, then shoot go for 4.10 gear and a more aggressive stall convertor.

**hamburger68** · 01-19-2007, 11:07 AM

To offer a totally different approach:
I'm gonna stick to my 2.73 gears (in fact i just had them replaced), 'cause i wanna see how fast this baby goes on the autobahn!
I guess 170 - 180 mph isn't out of reach... Anyone of you tried that in an f-body yet? (And survived?)

**LS2Tuner** · 01-19-2007, 11:31 AM

Originally Posted by schrysler

would going from 273 to 373 be a pretty drastic difference?

Yes MAJOR change.

sped · 02-09-2007, 09:25 PM

Where can you buy 3:73 gears from? I've been having a little trouble finding them. Also, you can't use a programmer on my 93 LT1, so what the heck would I do if I got new gears? Would I have to do anything?

**djvaly** · 02-15-2007, 07:49 AM

Originally Posted by hamburger68

To offer a totally different approach:
I'm gonna stick to my 2.73 gears (in fact i just had them replaced), 'cause i wanna see how fast this baby goes on the autobahn!
I guess 170 - 180 mph isn't out of reach... Anyone of you tried that in an f-body yet? (And survived?)

you ain't getting 180mph, from LS1 that easily, I'd say 170 top more realisically.

**DeadZ28** · 02-15-2007, 08:13 AM

Originally Posted by djvaly

If I have this idea right, a torque converter (stall converter) provides additional torque multiplication equivalent to a higher numerical gear ratio..
so if I were to do 3.73 gears why would I need to do 3000-3200 stall converter? would I do one or the other? please explain.. Thanks!

Let me make this simple. Gears are great and all in torque amplification but your car makes more power at certain RPM ranges. HP is greater at higher RPM's what the converter is going to do is lockup at that certain stall speed that it was made for and transfer that power at higher RPM's to the wheels.

Heres a analogy that I really like when you go outside jogging you start to breathe in and out faster and harder. Well the same thing goes for a performance engine. The engine is breathing in and out harder and faster, at a higher rpm. If a high performance engine makes power at a higher rpm, then a higher stall speed torque converter is what you need to put more power to the ground quicker.

Personally I liked my 4.10's in conjunction with my PI 3000 stall. Couldnt catch traction worth a d*** but enjoyed it.