CLASS RACER FORUM - View Single Post - Will a gear change help a redlighting problem in my bracket car?

Everett Vassar · 06-01-2009, 02:22 PM

Dont know WTF whats so different about my car.3K lb Duster mild 440/727/456 Runs low 7,s 1/8 1.53-1.55 60ft
Yesterday dropping my launch RPM down to 1800,staging as shallow as possible.Making sure I see the bottom yellow.Still .018 red.Getting frustrating.(I was dead on with a 6 after the redlight) I cant stare at the bottom yellow all day.Thats just way to inconsistent. So heres my choces I have come up with so far to slow the little Dusters R/T,s The cheapest and most suggested fix Simply leave in 2nd gear! I dont really like this cause it will slow the cars E.T. down .
Put a taller tire on the front.I have 25" hoosiers thats the tallest that will clear the Hooker fenderwells.
Go to a powerglide to get rid of that 727 2.45 1st gear ratio.Would love to,But too expensive right now.
And my latest thought Swap the 4.56 for a 3.91 I know I am probably doing ths the wrong way but heres some simple math of adding trans first gear ratios and rear gears ratios to come up with a final number.
1. Leaving in first with 4.56 = 7.01
2. Leaving in 2nd with 4.56 = 6.01
3. Powerglide with 1.76 low gear and 4.56 = 6.32 (I think this is where I want to be)
4. Leaving in first with 727 (2.45 low gear) and 3.91 rearend = 6.36
5. Same as above with 4.30 rearend = 6.75

Notice how close #3 and #4 are. A R&P set only about 200 bucks.I might lose a little E.T but should pick up a little MPH.

So am I on the right track here?

06-01-2009, 02:22 PM	#1
Everett Vassar Member Join Date: Jun 2004 Location: Kennedale,Tx Posts: 227 Likes: 0 Liked 2 Times in 2 Posts	Will a gear change help a redlighting problem in my bracket car? Dont know WTF whats so different about my car.3K lb Duster mild 440/727/456 Runs low 7,s 1/8 1.53-1.55 60ft Yesterday dropping my launch RPM down to 1800,staging as shallow as possible.Making sure I see the bottom yellow.Still .018 red.Getting frustrating.(I was dead on with a 6 after the redlight) I cant stare at the bottom yellow all day.Thats just way to inconsistent. So heres my choces I have come up with so far to slow the little Dusters R/T,s The cheapest and most suggested fix Simply leave in 2nd gear! I dont really like this cause it will slow the cars E.T. down . Put a taller tire on the front.I have 25" hoosiers thats the tallest that will clear the Hooker fenderwells. Go to a powerglide to get rid of that 727 2.45 1st gear ratio.Would love to,But too expensive right now. And my latest thought Swap the 4.56 for a 3.91 I know I am probably doing ths the wrong way but heres some simple math of adding trans first gear ratios and rear gears ratios to come up with a final number. 1. Leaving in first with 4.56 = 7.01 2. Leaving in 2nd with 4.56 = 6.01 3. Powerglide with 1.76 low gear and 4.56 = 6.32 (I think this is where I want to be) 4. Leaving in first with 727 (2.45 low gear) and 3.91 rearend = 6.36 5. Same as above with 4.30 rearend = 6.75 Notice how close #3 and #4 are. A R&P set only about 200 bucks.I might lose a little E.T but should pick up a little MPH. So am I on the right track here?