Post deleted by Defbob
[Re: Cab_Burge]
#676269
04/21/10 03:28 AM
04/21/10 03:28 AM
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Anonymous
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Re: 3.09 first gear set better for drag racing?
[Re: Cab_Burge]
#676271
04/21/10 09:01 AM
04/21/10 09:01 AM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
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Quote:
I have used the 3:09 box in a drag car years ago, there is almost no wind restitance or drag on the 1-2 gear change so the car never saw the problem your thinking of. One of the most common aftermarket custom gear ratio for the NP833 had a 2:98 first gear ratio back in the day berfore all of the aftermarket drag race only transmissions came out in the mid 1970s, not far from the stock A body 3.09 ratio. The one bad thing about the 3.09 boxes is the size of the gear on the input shaft  Not the strongest rascal availble 
This is good info to know! Ive never seen the 3.09 first, but is it that bad? this will be going into a mid 11 second car, 23 spline tranny if it happens...whatdya think? am i better off just leaving it? i tried calling liberty to see if they had any red stripes left, but getting one of them on the phone is like waiting for the president
most people think that the bigger first gear means blowing tires off, but if you look at all top manual transmision boxes their first ratio is usually a 2.95 or higher, so what explains that? not to mention the t5 i have in the car now is a 3.35 first and TONS of mustang guys hook with t5's and gear ratios lower than mine (4.10's, 4.30, etc.)...Im not disagreeing in the sense that yes the car needs to be able to hook suspension and tire wise, but the tall first gear is almost a must in stick drag racing to stay away from bogging and getting better 60' times...i was more worried about the shift from 1-2 since it seems like quite a drop and im not sure if it will hamper performance or not
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Re: 3.09 first gear set better for drag racing?
[Re: mshred]
#676272
04/21/10 09:54 AM
04/21/10 09:54 AM
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Joined: Jan 2003
Posts: 4,573
...gently down the stream
LAR_414
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...gently down the stream
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Don't do it. My dad used one for a while and it was slightly better getting out of the hole, but then it ripped the teeth off the gear. Heavy (3900lbs) B body running mid 11's.
First time he tried it, noticed a while later, that the splines were twisted. Didn't break anything, just took the trans out to check everything. So he put in another inputshaft. That one twisted and then ripped all the teeth off.
Maybe the metal that it's made of, is not that strong?
First and ONLY time in 40+years my dad hurt an 833!
Now he's back to stock 23 splint 2.66 ratio stuff,...not hurting a thing.
Oh yeah, slicks, power shifting, letting the tires spin a few revolutions coming out of the hole with a CF dual friction disk.
Last edited by LAR_414; 04/21/10 09:58 AM.
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Post deleted by Defbob
[Re: 72Challenger]
#676273
04/21/10 10:24 AM
04/21/10 10:24 AM
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Re: 3.09 first gear set better for drag racing?
[Re: BBLM23]
#676276
04/21/10 10:49 AM
04/21/10 10:49 AM
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Joined: Mar 2005
Posts: 2,172
Ohio
theclutcher
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Quote:
Quote:
...are you kidding I wrote the book 
chiseled in stone...
I was thinking of Moses myself.
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Re: 3.09 first gear set better for drag racing?
[Re: theclutcher]
#676277
04/22/10 10:50 PM
04/22/10 10:50 PM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
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Quote:
stock red stripe ratios vs 309 gear set.
race red stripe--- 2.65 1.64 1.19 1.00
309 gear set----- 3.09 1.92 1.40 1.00
The drop between 3rd and 4th is more of a concern than anything else, and for anything but full race application, that 309 set is a decent affordable option imo.
With todays slipper clutches, longevity should only be improved.
As stated by others, it depends on the package.
Dumping the clutch in anything weighing near 4000 lbs should be expected to have reduced life.
Add bite, hp and no clutch slippage and something will give.
thanks for the info! i had always thought that the redstripe was a 2.95 first, but i guess i was wrong. Its all in the clutch in getting a stickshift to live, so thats definatly something im not gonna skimp on. As far as the 3-4 shift goes, the drop doesnt seem too bad....what kinda car and et's were you seeing with this gearset when you were using it?
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