what gears?

**LS1 oldtimer** · 11-24-2010, 05:43 PM

When I bought the T/A I was told it had the 3.23 gears. It runs 2000 rpm or maybe a hair more at 70 mph. It is an A4 with the stock converter, does this sound right? What rpm would 3.73's run at 70 mph? 4.10's? Thanks

**Cutlass** · 11-24-2010, 05:56 PM

We have a sticky to help out with that. Here it is: Gear/MPH Calculator

3.23 at 70mph should be 2050 rpm
3.73 at 70mph should be 2400 rpm
4.10 at 70mph should be 2650 rpm

**67CamaroRSSS** · 11-24-2010, 06:16 PM

I ran with 3.73's for years before I burnt up the pinion bearing drag racing.

I currently have 3.23's and I find the hiway mileage to be about 4mpg better than what I achieved with the 3.73's at the same mph/rpm.

Just driving the car around isn't any better due to the stall.

**LS1 oldtimer** · 11-24-2010, 06:17 PM

Thanks!

**SteveC** · 11-26-2010, 03:47 AM

Try this link:

http://www.f-body.org/gears/

SteveC

**MrMasterCraft** · 11-26-2010, 05:41 AM

Originally Posted by Cutlass

We have a sticky to help out with that. Here it is: Gear/MPH Calculator

3.23 at 70mph should be 2050 rpm
3.73 at 70mph should be 2400 rpm
4.10 at 70mph should be 2650 rpm

My 2.73s are right at 2k RPM at 70mph... the 3.23s tach about 300RPM more, maybe

**Firebirdjones** · 11-26-2010, 12:03 PM

Originally Posted by MrMasterCraft

My 2.73s are right at 2k RPM at 70mph... the 3.23s tach about 300RPM more, maybe

Is your converter locking up?

Sounds awfull high for 2.73's. I have 3.23's and spin about 2,000-2,100 at 70 mph. Pretty much what everyone else is doing here.

300 rpm more and I'm doing 80+

**Firebirdjones** · 11-26-2010, 12:04 PM

Originally Posted by 67CamaroRSSS

I ran with 3.73's for years before I burnt up the pinion bearing drag racing.

I currently have 3.23's and I find the hiway mileage to be about 4mpg better than what I achieved with the 3.73's at the same mph/rpm.

Just driving the car around isn't any better due to the stall.

Since when did you switch back to 3.23's?? Race it since??

**67CamaroRSSS** · 11-26-2010, 01:00 PM

Originally Posted by Firebirdjones

Since when did you switch back to 3.23's?? Race it since??

I had Sean @ TGMS swap gears (he had a used set laying around) before we all went to LA Invasion. It was squealing pretty bad. It now makes no noise at all.

I haven't been to the track yet. I'm curious to see what the difference will be but I also don't want anything else to go wrong as it's running great right now.

**Firebirdjones** · 11-26-2010, 03:29 PM

Originally Posted by 67CamaroRSSS

I had Sean @ TGMS swap gears (he had a used set laying around) before we all went to LA Invasion. It was squealing pretty bad. It now makes no noise at all.

I haven't been to the track yet. I'm curious to see what the difference will be but I also don't want anything else to go wrong as it's running great right now.

Would be interesting, since we both run the same converter, I still have the 3.23's, although mine is a tad heavier than yours, I like the way it runs as is. 60 foots well on stock rubber, dipped into the 12's like that with just headers. I planned a mild camshaft that works well with the 3.23's and leave it at that. I'd like to see a comparison of your best ET with your gear change, lets get that down to the track while the weather is cool, let me know and I'll be there.

**MrMasterCraft** · 11-26-2010, 08:28 PM

Originally Posted by Firebirdjones

Is your converter locking up?

Sounds awfull high for 2.73's. I have 3.23's and spin about 2,000-2,100 at 70 mph. Pretty much what everyone else is doing here.

300 rpm more and I'm doing 80+

Unless somebody did a gear swap in both

GU2 is on the pewter car, and the GU5 code is on the white car, along with B4C

**98 t/a vert** · 11-26-2010, 09:13 PM

After seeing this thread I'm wondering about mine... 3.23's A4, bone stock, runs about 2300 or so at 70mph, a little over 2000 at 60. I first thought that was 2-3 hundred rpm high, but then shrugged it off.

**SteveC** · 11-27-2010, 03:13 AM

Originally Posted by 98 t/a vert

After seeing this thread I'm wondering about mine... 3.23's A4, bone stock, runs about 2300 or so at 70mph, a little over 2000 at 60. I first thought that was 2-3 hundred rpm high, but then shrugged it off.

It is really easy to tell if the converter is locking up, just count the shifts the transmission is making, there should be 4, 1-2, 2-3, 3-od, lockup. On my vehicle the lockup occurs @ 43mph normal unagressive driving. Once lockup occurs you are 1-1 with the transmission.

SteveC

**Firebirdjones** · 11-27-2010, 07:53 AM

Originally Posted by 98 t/a vert

After seeing this thread I'm wondering about mine... 3.23's A4, bone stock, runs about 2300 or so at 70mph, a little over 2000 at 60. I first thought that was 2-3 hundred rpm high, but then shrugged it off.

You were correct in your assumption,,,,that is in fact 2-300 rpm too high.

Sounds like your converter isn't locking up.