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Old 03-19-2011, 09:36 PM
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Dana 44 Gears Question

Hey guys,

Took my Chevy Luv to the track for the first time today. Specs are as follows:

-454 bored .030 over / 4 bolt main
Stock bottom end with probably 8 to 8.5 to 1 compression.
-781 Large Oval Heads with some minor port work and stock valves
-Lunati Voodoo Hydraulic Flat Tappet Cam: 1400-5700 power band, 219/227 -at .050 and .530 / .542 lift with 112 lobe centers
-Turbo 350 with about a 2000 stall
Performer RPM Air Gap Intake
-750 Holley VS that is probably flowing around 780 with horn cut off

I am currently running a 29 inch tall Goodyear Slick on a narrowed Dana 44 with around 3.40 gears. I checked the numbers on the differential and I got the gear ratio from those numbers. It is also a 6 lug bolt pattern.

When I was going doing the track my I was shifting at about 5500-6000 RPM and was crossing the end of the quarter mile at the top of SECOND gear.

Would it be more beneficial for me to go to a stiffer gear (like around a 4.30-4.56 gear) so that I can actually get some use out of third gear? If so, will either of these gear sets work? Difference between "thick gears" and standard Mopar gears? Don't want to have to change the carrier in any case.

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWAX:IT

or

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWAX:IT

I know I should cross the finish line at the top of my RPM band, but I would think that should be in 3rd gear and not 2nd gear.

Any insight or suggestions on gear ratio and type would be great. I am an idiot when it comes to doing those calculations.

Best time at the track was a 13.1 at 103 MPH or so speed. (with a 1 second reaction time ). So I could have easily been in the 12's if my our reaction time was quicker. Truck weighs 3000 lbs. with me in it.

Thanks for any help and suggestions.

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Last edited by 31fordcoupe; 03-19-2011 at 09:41 PM.
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Old 03-19-2011, 10:27 PM
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Yes, going to a lower rear gear will benefit you two ways: #1 is it will increase your starting line ratio(1st gear in trans x rear gear), really improving your launch(if it hooks LOL), and #2 is it will allow you to use all the gears in the transmission.

I would expect it to accelerate much faster after the gear change.

You'll need a "thick" gear set if you want to put a 3.90-up ratio(4 series gears) on your current 3 series differential carrier.

Hard to tell which would be better, 4.30 or 4.56, when you haven't been able to get it into high gear yet. Just playing with a ratio calculator you are running roughly the same as a 2 speed trans and 5.00 gear right now, when you run through the finish line in 2nd on your 3 speed trans and the 3.40 rear gear. I would probably err to the low side and go with 4.30 so you don't run the risk of overrevving what you have, as it will pick up some mph when it runs quicker.

I used a calculator at www.wallaceracing.com on the Automotive Calculators page, allows you to play with gearing in both the rear and the trans. Second gear in a TH-350 is 1.52:1.

Reaction time is seperate from the ET clocks. Reaction time measures the time between the green light coming on and the front wheel moving out of the stage beam. The ET clock doesn't start until the front wheel leaves the stage beam and runs until the finish line beam is blocked.

You could sit on the line for 10 seconds after the light turns green and it still won't change your ET. Your 13.1 ET would be the same whether you had a .500 second reaction time or a 10.0 second reaction time.
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Old 03-19-2011, 10:44 PM
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If your sole purpose is getting to the end of the quarter mile track, by all means I'd go with lower gears. With 29 inch tires and running 3.40 gearing, I would think you should still be able to shift to 3rd gear? By going to a gear such as 3.70's you won't see much difference, bit a set of 4.11 or lower gears would really make you feel a difference and bring those times lower.
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Old 03-20-2011, 12:43 AM
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Eric,

Again, you taught me something I did not know. So your RT really only matters when you are staged up against an opponent.

Thanks for your input on the gear selection too. I think you are probably right about the 4.30's but I did some calculations on a website calculator and it said at 6000 RPM with a 29.5" tire and 4.56's would get me a trap speed of 115 (my best was 105 with current gearing). So I don't know. I guess I will just pick one (more than likely the 4.30's) and go with it.

You have any guestimates as to how much time (if I get traction) I might be able to cut off my time 1/4 time by going to a 4.30 or 4.56 gear? I know it's a total wild *** guess but I would like to hear how much quicker you think I will be in the 1/4. Thanks again.

Brent
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Old 03-20-2011, 03:13 AM
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That's correct, reaction time really only matters when staged against an opponent. It is a good thing to "practice" on every run though, just to improve yourself.

I could see it picking up 4+ to maybe 6 tenths with the better rear gear change, and then maybe 2-3 tenths more as you tune and learn the combo. A 3 speed trans most often likes an early shift into second gear, 300-400 rpm earlier than the 2-3 shift would be. It's something you'll have to try out.
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Old 03-20-2011, 02:27 PM
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Thanks again Eric. If I can get this thing into the mid 12's on stock compression I'll be happy then a pig in poop.
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Old 03-20-2011, 03:38 PM
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Quote:
Originally Posted by ericnova72
Yes, going to a lower rear gear will benefit you two ways: #1 is it will increase your starting line ratio(1st gear in trans x rear gear), really improving your launch(if it hooks LOL), and #2 is it will allow you to use all the gears in the transmission.

I would expect it to accelerate much faster after the gear change.

You'll need a "thick" gear set if you want to put a 3.90-up ratio(4 series gears) on your current 3 series differential carrier.

Hard to tell which would be better, 4.30 or 4.56, when you haven't been able to get it into high gear yet. Just playing with a ratio calculator you are running roughly the same as a 2 speed trans and 5.00 gear right now, when you run through the finish line in 2nd on your 3 speed trans and the 3.40 rear gear. I would probably err to the low side and go with 4.30 so you don't run the risk of overrevving what you have, as it will pick up some mph when it runs quicker.

I used a calculator at www.wallaceracing.com on the Automotive Calculators page, allows you to play with gearing in both the rear and the trans. Second gear in a TH-350 is 1.52:1.

Reaction time is seperate from the ET clocks. Reaction time measures the time between the green light coming on and the front wheel moving out of the stage beam. The ET clock doesn't start until the front wheel leaves the stage beam and runs until the finish line beam is blocked.

You could sit on the line for 10 seconds after the light turns green and it still won't change your ET. Your 13.1 ET would be the same whether you had a .500 second reaction time or a 10.0 second reaction time.

Read the last two paragraphs above.

You could sit on the line for an hour and the ET would be the same as if you cut the "Perfect Light".

Your reaction time means NOTHING unless you are ACTUALLY RACING the other car.

I hope we cleared that up for you.


454 RATTLER
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Old 03-20-2011, 07:23 PM
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Um yeah I got it.
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