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Old 07-20-2013, 12:49 AM   #1
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L99 gears 3.45 or 3.70?

in the process of adding a circle-D 3200 stall, 18" Drag radials and E.T. streets and the car WILL see a 125 shot next spring... for the L99 guys, is 3.70s too much gear for the street? I know DRs will be must with a 3200 stall but I'm not wanting TOO much gear(as in prepped track on ET streets or I go up in smoke, lol) and I can get a set of 3.45s pretty cheap...
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Old 07-20-2013, 03:33 AM   #2
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in the process of adding a circle-D 3200 stall, 18" Drag radials and E.T. streets and the car WILL see a 125 shot next spring... for the L99 guys, is 3.70s too much gear for the street? I know DRs will be must with a 3200 stall but I'm not wanting TOO much gear(as in prepped track on ET streets or I go up in smoke, lol) and I can get a set of 3.45s pretty cheap...
A 3.70 will put you into 5th gear by the end of the 1/4. Not to mention it'll be way to much on the launch. Go 3.45's.
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Old 07-20-2013, 08:24 AM   #3
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I had 3.70 gears and changed to 3.45 gears for exactly the reason Jamie mentioned above.
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Old 07-20-2013, 08:38 AM   #4
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What about for higher power levels? Or are 3.45s in general what work for an auto?
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Old 07-20-2013, 08:55 AM   #5
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The last time that I was at the track,I crossed the line at about 5700RPM in 4th gear. mph was 118.

28" DR. 3.45 gears. torque converter flash at 2000RPM.Cammed car.
I now have a 3400RPM converter in it,hopefully will run it at the track again soon.
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Old 07-20-2013, 05:30 PM   #6
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3.45 it is... now anyone know about this company? or another source for 3.45s?

http://mudflaps.com/i-13176286-g2-ax...FUqk4AodmzkAsw


I'm going to check with Performance Torque Converters(PTC, huge name for torque converters here in the South and is local to me, like 10 miles from my house, lol) about getting a converter for a 6L80E through them, but if not, I can get a 11" built through Circle-D with a 3200 stall shipped to my door for around $550, Yank and TCI are ridiculously priced on their converters...
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Old 07-20-2013, 05:35 PM   #7
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What about for higher power levels? Or are 3.45s in general what work for an auto?
3.45's is what you want.
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Old 07-20-2013, 05:39 PM   #8
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3.45 it is... now anyone know about this company? or another source for 3.45s?

http://mudflaps.com/i-13176286-g2-ax...FUqk4AodmzkAsw


I'm going to check with Performance Torque Converters(PTC, huge name for torque converters here in the South and is local to me, like 10 miles from my house, lol) about getting a converter for a 6L80E through them, but if not, I can get a 11" built through Circle-D with a 3200 stall shipped to my door for around $550, Yank and TCI are ridiculously priced on their converters...


Get the GM 3.45's


Stay away from the PTC. It's a great converter... In a different car. We have one in the grand national. It's at PTC right now.

Go with the Circle D. Get use to camaro parts being overpriced. It's just how it is.
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Old 07-20-2013, 07:25 PM   #9
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I cross the line in 4th gear with 3.70s with no problem and ran a 1.50 60'. I do agree that a 3.45 to 3.50 gear is better on high horsepower applications and makes for easier tuning especially on the 6l.
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Old 07-20-2013, 07:36 PM   #10
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I can get 3.45's if you need a new set.Master install kits aswell.


Quote:
Originally Posted by 2SSRSinBama View Post
3.45 it is... now anyone know about this company? or another source for 3.45s?

http://mudflaps.com/i-13176286-g2-ax...FUqk4AodmzkAsw


I'm going to check with Performance Torque Converters(PTC, huge name for torque converters here in the South and is local to me, like 10 miles from my house, lol) about getting a converter for a 6L80E through them, but if not, I can get a 11" built through Circle-D with a 3200 stall shipped to my door for around $550, Yank and TCI are ridiculously priced on their converters...
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Old 07-21-2013, 12:54 AM   #11
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Originally Posted by 2SSRSinBama View Post
3.45 it is... now anyone know about this company? or another source for 3.45s?

http://mudflaps.com/i-13176286-g2-ax...FUqk4AodmzkAsw


I'm going to check with Performance Torque Converters(PTC, huge name for torque converters here in the South and is local to me, like 10 miles from my house, lol) about getting a converter for a 6L80E through them, but if not, I can get a 11" built through Circle-D with a 3200 stall shipped to my door for around $550, Yank and TCI are ridiculously priced on their converters...
I would recommend a multi disk converter from Circle-D I had a PTC and was not happy a Circle-D was a way better one , the 6L80Es respond very well with multi disk a lil pricey but way worth it.
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Old 07-21-2013, 04:40 PM   #12
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what about the Yank SS3200? and anyone have a part # on the GM 3.45s?
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Old 07-21-2013, 05:46 PM   #13
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If you get a triple disc Circle D converter, 3.70 will definitely not be too much gear with a stock height tire! You will be able to lock the converter which does change the equation. In a bolt on car this is the perfect gear.

However, once you add nitrous, your hp may throw you over the rpm limit. I would say it could be close but probably slightly run out of gear.

Really depends on which set up you want to optimize. Your NA bolt on set up, or your nitrous set up! If your goal is to have the fastest time with your nitrous then I would say 3.45's.

Fyi, I don't think Yank sells a triple disc either,
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Old 07-22-2013, 12:28 AM   #14
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the reason I want to go single disc is... this car is a daily driver(well not really, more like weekend warrior, lol... I do have another car for work)... I know a multi-disc is very beneficial, but I think the characteristics of a single disc will better fit what I want out of my car... its not really a cost issue so much as it is, harsh lockup vs. non-harsh lockup...
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Old 07-22-2013, 01:08 AM   #15
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the reason I want to go single disc is... this car is a daily driver(well not really, more like weekend warrior, lol... I do have another car for work)... I know a multi-disc is very beneficial, but I think the characteristics of a single disc will better fit what I want out of my car... its not really a cost issue so much as it is, harsh lockup vs. non-harsh lockup...
Maybe you should try to find someone around you that will let you ride in their car with a triple disc? Mine is a DD and I'm not sure what you mean by harsh lockup?? It shifts smooth just like as if it has an extra gear at part throttle! In the 1/4 mile, I can't wait until it locks! It feels amazing!
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Old 07-23-2013, 01:10 AM   #16
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Quote:
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the reason I want to go single disc is... this car is a daily driver(well not really, more like weekend warrior, lol... I do have another car for work)... I know a multi-disc is very beneficial, but I think the characteristics of a single disc will better fit what I want out of my car... its not really a cost issue so much as it is, harsh lockup vs. non-harsh lockup...
I DD my truck (BIG HP) with a multi disk for 2yrs and drove like a champ, they lock up good for DD. Vs some single disk that lock up the first 2,000 miles and remain open the rest of its lifespan. Just giving my 2 cents. And my rpms were pretty low on the road too had a 3200 stall.
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Old 07-23-2013, 07:23 AM   #17
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I had both a single disc and triple disc Vigilante in mine and definitely like the triple disc better. Especially if the car will see any track time.

I know there were a number of earlier posts about problems with Yank.
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Old 07-23-2013, 09:40 PM   #18
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Different schools of thought here. 3.70s are fine...actually a lot of fun on the street. I have lingenfelter/aam.
If you change cam where you can twist it you can keep it where you want it and probably run quicker than a 3.45 car. But yes, problem is hooking it. It is harder than a 3.45 car. Mine dead hooks on a single disc3200 pro torque from JRE but that is getting pulled in favor of a circleD3600 billet triple.
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Old 07-23-2013, 09:42 PM   #19
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U need to hit up rhino79...the combo you are hunting is in his wheelhouse.
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Old 07-26-2013, 11:04 PM   #20
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I'd do a cam before I did a gear.

I think if I added a cam and spray to my car, I'd expect to go 10.7's.
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Old 07-26-2013, 11:07 PM   #21
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I'd do a cam before I did a gear.

I think if I added a cam and spray to my car, I'd expect to go 10.7's.
How much spray?
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Old 07-26-2013, 11:49 PM   #22
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OP said 125 shot, and I'd expect to run 11.4's cam only.
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Old 07-27-2013, 10:08 AM   #23
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FTI is supposed to be good triple disk but wayy pricey. I was quoted ~1200 for one..

I am still debating the gearing myself. With a centri s/c I'm sure a 3.70 would work great for me but hooking up easily is very important so still leaning towards the 3.45. Nitrous is supposed to be high torque so if you spray off the line 3.45 w/o a doubt.
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Old 07-27-2013, 10:42 AM   #24
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Why do you guys want to do gearing exactly?

Most folks, myself included would answer "I want to max out my combo."

But your combo NA or with 125 shot is different.

Way I see it, the money you spend on a gear might be similar to doing a cam. Which is net the bigger drop in ET? Should be the cam.

So let's say I did a gear or a cam, I'd drop from 12.2 to I think 11.5 with a cam conversatively (370rwhp to 450rwhp). If I did a 3.45 I'd pick up hardly anything on ET. If I did a 3.70 I'd maybe drop a tenth and my mph would go up maybe 2. Tim a friend has a 3.70 gear, no converter and his car routinely runs 112 mph and sometimes 113 mph even in the summer.

Which, the cammed (+ exhaust + stall) car or the gear (+ same) will be quicker on spray.

I've sprayed a a few cars. Nitrous makes an 11.5 car quicker, and a 11.9 car (that's where I would put the gear swap) quicker too but not as quick.

That's my view.
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Old 07-27-2013, 10:46 AM   #25
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If you can cross the line at 125mph.

With 3.91 gears and 28" tires,converter locked. you should be around 6700-6800RPM at the stripe.

3.70's = around 6400RPM
3.45's = around 6000RPM

These numbers only apply to the 6L80 cars.

I think Rhino79 run's 3.91 gears and a 4000RPM converter.He can chime in,I'd have to guess he's crossing the line at around 6700-6800RPM aswell.
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