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  #11  
Old 08-13-2011, 09:09 PM
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Timmy, running 4.10s with a 30" tire will be the same as running 4.56s with your factory tires. Plus you shave a little bit of unsprung/rotational weight.
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Old 08-13-2011, 09:32 PM
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I was wanting to run 4.56 gears with 27" tall tires 4.10s would be better on the highway though
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Old 08-13-2011, 10:24 PM
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It is possible to run faster in the 1/4 mile with lower numerical gearing. Higher numerical gearing acts as a torque multiplier, but depending on the torque curve of the engine, and the gearing of the transmission, you may have an advantage with lower numerical gearing by spending more time in a gear where you would be at an rpm producing more torque for more time...

You would have to figure out shift points, and what rpm you would be at after the shift, then find the area under the torque curve between that rpm and max rpm at shift, and do this for each gear while in the 1/4 mile, and compare with different rear end ratios, and the one with the largest area would be fastest. The more area means that it would be putting out more torque for the most time. I think this is how the program I have works, I don't know how else it would do it. I have a feeling 4.1 would run faster than 4.56 with the 545rfe (especially with the hemi). According to the program I have, the 4.1 run faster than 4.56 with the 4.7L. The benefit of the 4.56 is that you would have more low end on the street...

If the torque curve of the engine were perfectly flat over any rpm, higher numerical gearing would always be better....
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  #14  
Old 08-13-2011, 11:46 PM
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27" tires for the street... Holy Smokers!!!.
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Originally Posted by 916Timmy View Post
I was wanting to run 4.56 gears with 27" tall tires 4.10s would be better on the highway though
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Old 08-14-2011, 12:14 AM
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Just the track! I'll keep the 33s to save gas!
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Old 08-14-2011, 12:27 AM
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Gotchaaa.......
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Old 10-04-2011, 01:01 PM
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I agree with everyone about the atuomatics and low gears being better for the track. But I had lots of high to low 13 sec street cars with 3.23 gears. Had three of my good ones at the same time and my 4 speed 383/3.23 Chally was quicker than my 383 276/485 auto/3.91 Bee. You would think the Chally would have been slower out the hole with a 300/558 and 3.23 gears but it wasn't. First start and track day was with the 3.23's low 13's I did swap it out for a 3.91 and got it in the 12's but still...had another Chally too. Not too fast by todays standards but good for the 70/80's Had a Camaro/Cuda at the same time too, both full race with 5.13's lenco 5 speeds. Too bad the Nag wasn't around then. BTW...I met my wife on the highway in her 72 400 Grand Sport Torino. I hooked both her and her car and later her dads 70 428 Cobra Jet Torino. Their whole family raced Nascar...all Fords, it was a marrige in heaven for me!

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Old 10-04-2011, 08:19 PM
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Quote:
Originally Posted by snrusnak View Post
It is possible to run faster in the 1/4 mile with lower numerical gearing. Higher numerical gearing acts as a torque multiplier, but depending on the torque curve of the engine, and the gearing of the transmission, you may have an advantage with lower numerical gearing by spending more time in a gear where you would be at an rpm producing more torque for more time...

You would have to figure out shift points, and what rpm you would be at after the shift, then find the area under the torque curve between that rpm and max rpm at shift, and do this for each gear while in the 1/4 mile, and compare with different rear end ratios, and the one with the largest area would be fastest. The more area means that it would be putting out more torque for the most time. I think this is how the program I have works, I don't know how else it would do it. I have a feeling 4.1 would run faster than 4.56 with the 545rfe (especially with the hemi). According to the program I have, the 4.1 run faster than 4.56 with the 4.7L. The benefit of the 4.56 is that you would have more low end on the street...

If the torque curve of the engine were perfectly flat over any rpm, higher numerical gearing would always be better....
4.10 would be a better all around gear for you, I wouldn't go 4.56 being that you use it as a family truck. edit: I want to share my experience using 456 gears on the street. If you do use these gears and you can't hook up with them, the same 400hp truck, same everything side by side with 3.92/4.10 gears is going to walk away from you. The only way they will benifit you is if they hook up and that's hard to do on the the street with 4.56 gears. I'm not sure how it will affect these crappy traction control rearends, but I'm sure about it without them. So if you're using your truck for every day driving I wouldn't waist my time on 4.56's. It's a different story if it's the other way around and you use it mainly for racing on the track with some good rubber. Your truck may look good sliding all over the place but that's about it.

Last edited by RadioFlyer; 10-04-2011 at 08:48 PM.
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  #19  
Old 10-04-2011, 08:38 PM
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I agree, I'd go 4.10. You can match your tire size for the track to wind out the rpm's without hitting 4th gear, and run just as fast as if you had 4.56 and matched your tire size to do the same...
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Old 10-04-2011, 09:03 PM
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Quote:
Originally Posted by snrusnak View Post
I agree, I'd go 4.10. You can match your tire size for the track to wind out the rpm's without hitting 4th gear, and run just as fast as if you had 4.56 and matched your tire size to do the same...
Not sure about yours snrusnak but it ought to be pretty much the same. Unless you Hemi is cammed with a decent mid to high range torquer, 4.56 is overkill for a stock Hemi. I'm talking about a cam with at least a 250 duration even better a 276 using 30 to 31" tires. That would give the extra top end torque you would need with the 4.56 gear. You could prolly go with a 4.88 if you were using the 392 stroker 584/554 279/285 cam
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