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It is a 340 with a Comp Cams Xtreme Energy XS282S 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.

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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

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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.

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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

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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.

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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.

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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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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.

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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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My Duster ran a best of 12.67 at 107 mph with a 1.9 sixty foot last summer. I want to optimize my combo during the off season. Currently the car has a 741 case with a broken Sure-Grip and 3.91 gear (Found out the Sure-Grip was broke at Milans all Mopar day. Embarrassing to say the least). I am definitely going to upgrade to a 742 case with a spool. I want to turn 6500 rpm through the traps and I run a 27" tall tire. I am thinking 4.30's will be good. You guys have never steered me wrong so I thought I would consult the experts before I made a move.

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Fix the posi first Once that is done make your decesion I would look at two third members, one for street and one for racing 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 Most stock lie SB like being shifted around 6300 to 6700 RPM, the steeper rear gears will help it some on the top end but they are not a cure all Maybe 9secondPhil will chime in on his fisrt "Cab" car and the results of changing the rear gears from 3:55 to 4:89, not much if I'm remembering correctly

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Ryan..you don't need a spool! I've never ran one with my 440 GTX,and you know how that runs at the track..and on the street! My friend Bill,who owns Warren Gear and Axle,set mine up about 3 yrs. ago..still in one piece! And I don't BABY my drivetrains! My carrier is an old style from the early 60's with a clutch-plate type set-up. LOVE it! I run a 4:56 Richmond gear with 30" tall slicks..and street tires. My engine makes peak power at 6,000 rpm..through 1/4 traps at 6500-6600rpm..right where I want to be, 10% over peak! I think if you run a 27" tall tire,a 4:30 might be a little steep for the street! I've got a "spare" 489 case 4:10 gear,also set up by Bill,sitting in my pole barn..but I need to hang onto it..JUST IN CASE! If I were you,I'd give Bill a call..just don't mention my name..he might charge ya' double! ...J/K! He's a GREAT guy..and knows what the heck he's doing! My GTX is proof of that! Best of Luck on whatever you decide! Let me know what that is! Thanks! Randy

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Ryan..you don't need a spool! I've never ran one with my 440 GTX,and you know how that runs at the track..and on the street! My friend Bill,who owns Warren Gear and Axle,set mine up about 3 yrs. ago..still in one piece! And I don't BABY my drivetrains! My carrier is an old style from the early 60's with a clutch-plate type set-up. LOVE it! I run a 4:56 Richmond gear with 30" tall slicks..and street tires. My engine makes peak power at 6,000 rpm..through 1/4 traps at 6500-6600rpm..right where I want to be, 10% over peak! I think if you run a 27" tall tire,a 4:30 might be a little steep for the street! I've got a "spare" 489 case 4:10 gear,also set up by Bill,sitting in my pole barn..but I need to hang onto it..JUST IN CASE! If I were you,I'd give Bill a call..just don't mention my name..he might charge ya' double! ...J/K! He's a GREAT guy..and knows what the heck he's doing! My GTX is proof of that! Best of Luck on whatever you decide! Let me know what that is! Thanks! Randy

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Wow, it really is a small world. Bill is a friend of mine as well. Went with Bill, Derick (goes by Dericks here)to the St.Ignace meet. Derick drove his Duster and I drove the GTX there, no trailers

Anyway, Bill's a good guy and does good work. He's set up LOTS of rears in his day and will treat you right.

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Marc..that is a coincidence! Bill grew up the next street over from me,in Warren! We use to do a little "street racing" together..back in the early-late 70's! Like I stated,Bill puts rears together to last! In fact,he told me,with the way I drove the X...my 4:56 wouldn't last but 1 or 2 times to the track! Still proving him wrong! His assumption was based on the pinion design,and old-style case! I make a point to tell him the rear end's STILL in one piece,every time I see,or talk to him! Ryan..call him,you won't be sorry!

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I gave him a call on my lunch break. I am very pleased with the quote he gave me. He will be rebuilding my center section soon.