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Re: Will this gear be right for me?
[Re: bigsbigelow]
#897774
01/06/11 02:05 PM
01/06/11 02:05 PM
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Joined: Jan 2003
Posts: 684
St. Charles, MO.
Slingshot383
mopar
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mopar
Joined: Jan 2003
Posts: 684
St. Charles, MO.
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4.30's or 4.56's will work, what engine, what cam type (it makes a difference), what transmission?
1994 Undercover Chassis 125" altered
stack injected big block, soon blown and injected
Member of The Torque and Recoil Club
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Re: Will this gear be right for me?
[Re: Slingshot383]
#897775
01/06/11 02:12 PM
01/06/11 02:12 PM
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Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
bigsbigelow
OP
pro stock
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OP
pro stock
Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
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It is a 340 with a Comp Cams Xtreme Energy XS282S (.520 / .540 lift and 244 / 252 duration at .050) and 10.5:1 compression. The trans is a 727 with stock gears and a 9.5" PTC 3500 rpm converter. I do a lot of street driving with the car as well.
Last edited by bigsbigelow; 01/06/11 02:16 PM.
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Re: Will this gear be right for me?
[Re: Get-X]
#897781
01/06/11 03:01 PM
01/06/11 03:01 PM
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Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
bigsbigelow
OP
pro stock
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OP
pro stock
Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
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Quote:
Quote:
when i ran my 340 last yr i had 28/10.5 slicks and 4.57 gears and would turn 62/6300 in the 1/8 mile so i think 4.30 would be better in your case jmop mike
I agree that the 4.30 is the best gear at the track, but they aren't great for street use. If the car is mostly a drag racer and only occasionly sees the street, than the 4.30 would be perfect. If it's mostly a street car that goes to the track once or twice a year use the 4.10 IMO. 
I guess I should mention that I can tolerate losing some "street-ability" for a faster car. There is a group of tuner guys that I am friends with. I want to be able to inch them out at the track with an all motor combo. 12 flat is the fastest car in the group. I think i can reach that with the correct gear.
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Re: Will this gear be right for me?
[Re: BSB67]
#897786
01/07/11 11:20 AM
01/07/11 11:20 AM
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Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
bigsbigelow
OP
pro stock
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OP
pro stock
Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
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Quote:
Not to be Debbie Downer, but you'll need to find more hp to go 12.0 or faster, the 107 mph indicates not enough hp.
Be sure to check with guys running a spool on the street, as some don't like it.
You don't think so? That 107 mph was at 5800 rpm. That is why I want a gear change. Shoot, I shift higher than I trap. I have also driven a couple cars with a spool. I can definitely notice the difference but it doesn't bother me.
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Re: Will this gear be right for me?
[Re: forphorty]
#897788
01/08/11 11:51 AM
01/08/11 11:51 AM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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Quote:
If your stall speed is really only 3500,I think a looser convertor (4500ish} would pick up more than any gear change.
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Re: Will this gear be right for me?
[Re: bigsbigelow]
#897789
01/08/11 04:04 PM
01/08/11 04:04 PM
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Joined: Feb 2005
Posts: 4,313
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,313
Prospect, PA
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Quote:
Quote:
Not to be Debbie Downer, but you'll need to find more hp to go 12.0 or faster, the 107 mph indicates not enough hp.
Be sure to check with guys running a spool on the street, as some don't like it.
You don't think so? That 107 mph was at 5800 rpm. That is why I want a gear change. Shoot, I shift higher than I trap. I have also driven a couple cars with a spool. I can definitely notice the difference but it doesn't bother me.
No, I don't think so. We've done this a few times and when nothing else is changed, and you adjust appropriately for atmospheric conditions, it might be 1 mph. And if you go with the gear that gives you the very best et, you might be down a little in mph. Going to a spool might few up a few ponies - I don't know.
Try it and report back. It's always good to have data from well controlled test conditions. It will be quicker. And if I'm mistaken, I'd like to know that too.
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Re: Will this gear be right for me?
[Re: BSB67]
#897790
01/08/11 04:19 PM
01/08/11 04:19 PM
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Joined: Aug 2007
Posts: 2,449
nc
earthmover
top fuel
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top fuel
Joined: Aug 2007
Posts: 2,449
nc
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Loc: Ohio Re: Will this gear be right for me? [Re: bigsbigelow] #6401288 - Thu Jan 06 2011 02:51 PM Edit Reply Quote Quick Reply Last year we ran a 340 Duster with 28" tall slicks & a 4:56 gear. Had a best 60' @ 1.68, 1/8 mile 7.71 @ 90.98 mph, 1/4 mile was a 12.19 @ 109. Shifted @ 6200 & crossed the line @ 6500 rpm. It's mostly a stock short block with stock iron heads. I'm thinking we've still got about another .3 in the 1/4 left on the table. my 340 was a little more then stock about 11.1 comp. and 520/540 soild cam mild heads but ran a best of 7.44 at 89.9 with a 1.67 60' which was not the best 60' i think it had more in it with some frontend workand a new set of slicks ( check holes was gone on the set i had) but ill never know i sold the short block...your mph is better with about the same 60' so hard to say...but i think the 4/30 is a preety good gear as well. mike
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i've got a buddy that loves them and they work great for him and he drives it alot ..i have even drove my little mess a few times and it didnt bother me at all never ran hot but its all in what you will live with and what you would like to do with the car.... 
as far as the right ratio and finish line RPM find out where the car likes being shifted out of first and second gears by looking at the 330 and 660 ft. times and MPH 
