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post #1 of 21 (permalink) Old 10-12-2010, 07:09 AM Thread Starter
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How much gear is too much gear?

Ok im very bored with my car. All mods are listed in my sig, i found a set of 4.10's for a good price online . Im running 3.73's now and a 3500 stall. Its a decent combination but honestly everyday I drive this car it just feels slower and slower. I was curious on if 4.10's would be a good choice. Im not worried about gas mileage obviously and ill also be contacting Alan for a 4000 stall (minimum) around tax time. So give me your opinions. Are 4.10's beneficial to run with and svo blower? Every little bit helps right?

04 PI swap,SVO Supercharger 8-9 psi,Alcohol injection,39lbs Cobra injectors,XCal2-Walbro 255 LPH fuel pump,4.10 T-Lok,2003 4R70W built to withstand by RobertP,450hp JMOD,3800 circleD stall,trucool 4739 Trans Cooler,Dynotech 3.5 Driveshaft,70mm T/B,SCP Cold Air Intake,90mm LMAF,JBA headers,Magnaflow Midmount,No cats with 3inch piping,Vogtland 1.6inch drop,Cobra R's and xenon body kit.

Its slow, Really.
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post #2 of 21 (permalink) Old 10-12-2010, 07:40 AM
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IMHO 4.10 is as high as I would go, And Mine seams to get faster. & faster .I guess my trans & top end is getting broke in . Very pleased with how this SVO runs

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post #3 of 21 (permalink) Old 10-12-2010, 07:53 AM
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I'm a bad person to ask....

I geared mine so the RPM was where I wanted it going through the traps. I can deal with driving it with that gear. I don't know what your car runs, or what you think your useful RPM limit is, but I'd start with that info, and adjust the gear to put you there in a quarter mile. Just my .02.

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post #4 of 21 (permalink) Old 10-12-2010, 08:12 AM Thread Starter
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It ran 12.8 at like 105ish. It feels like it needs to pull harder in the mid to high rpm range in 3rd. Im thinking if I can get threw the gears faster it'll trap higher and run a faster time.

04 PI swap,SVO Supercharger 8-9 psi,Alcohol injection,39lbs Cobra injectors,XCal2-Walbro 255 LPH fuel pump,4.10 T-Lok,2003 4R70W built to withstand by RobertP,450hp JMOD,3800 circleD stall,trucool 4739 Trans Cooler,Dynotech 3.5 Driveshaft,70mm T/B,SCP Cold Air Intake,90mm LMAF,JBA headers,Magnaflow Midmount,No cats with 3inch piping,Vogtland 1.6inch drop,Cobra R's and xenon body kit.

Its slow, Really.
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post #5 of 21 (permalink) Old 10-12-2010, 08:40 AM
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If you don't care about gas mileage, and you don't do a lot of highway driving with the car, 4.10s should be fine. There are plenty of birds running around with 4.10s without issues. Personally, I prefer the 3.73s because you can still cruise at 80 on the highway without the motor screaming, but if you're looking for a quick fix to make the car feel faster again, 4.10s should do the trick. I don't know how much they'll actually help in the 1/4, but on the street it will make the car a lot more fun.

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post #6 of 21 (permalink) Old 10-12-2010, 08:49 AM
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your trap won't go higher do to the gear...you will just a get a lower E.T.

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post #7 of 21 (permalink) Old 10-12-2010, 09:17 AM
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I always heard that 3.73's were as high as you wanted to go with a supercharger, because they need the load... is this not true?

I vote you go with a blown 4v build

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post #8 of 21 (permalink) Old 10-12-2010, 09:52 AM
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Quote:
Originally Posted by [email protected] View Post
I always heard that 3.73's were as high as you wanted to go with a supercharger, because they need the load... is this not true?
You must be thinking turbo.

Delete my account.
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post #9 of 21 (permalink) Old 10-12-2010, 10:03 AM
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no, turbo's love gear, because it makes them spool faster.

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post #10 of 21 (permalink) Old 10-12-2010, 10:17 AM
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Quote:
Originally Posted by [email protected] View Post
no, turbo's love gear, because it makes them spool faster.
You may either want to A: rephrase that, B: learn more about it, or C: go ahead and bet your car on that statement.

At any rate....we're done hijacking OP's thread.

Delete my account.

Last edited by 94 Thunderbird XX; 10-12-2010 at 10:26 AM.
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post #11 of 21 (permalink) Old 10-12-2010, 10:47 AM
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I'm running an 8.8 tac-lok with 4.10s as my daily driver. Lost a little bit of gas mileage, but not much. MadMike actually is the one that installed the new 4.10s and rear into my bird. I like them and I have not had a problem. I take it down the highway to work and I've had it at 80-90ish mph with no problems. It gives a good pull especially hitting around 60mph and up. Now if I could only get the transmission to shift better then we'd be golden lol.

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post #12 of 21 (permalink) Old 10-12-2010, 11:50 AM
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Come down again some time and we can do a B&M shift kit in that trans if you want.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
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post #13 of 21 (permalink) Old 10-12-2010, 11:51 AM Thread Starter
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Quote:
Originally Posted by _95badbird View Post
your trap won't go higher do to the gear...you will just a get a lower E.T.
Lower ET is fine. I'd like to at least get 115mph though in the 1/4. I just wanna know if the 4.10's are going to be beneficial on a SVO car.

04 PI swap,SVO Supercharger 8-9 psi,Alcohol injection,39lbs Cobra injectors,XCal2-Walbro 255 LPH fuel pump,4.10 T-Lok,2003 4R70W built to withstand by RobertP,450hp JMOD,3800 circleD stall,trucool 4739 Trans Cooler,Dynotech 3.5 Driveshaft,70mm T/B,SCP Cold Air Intake,90mm LMAF,JBA headers,Magnaflow Midmount,No cats with 3inch piping,Vogtland 1.6inch drop,Cobra R's and xenon body kit.

Its slow, Really.
LS1 KILLER
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Parts FOR SALE http://forums.tccoa.com/showthread.php?t=132585
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post #14 of 21 (permalink) Old 10-12-2010, 12:33 PM
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Quote:
Originally Posted by 94 Thunderbird XX View Post
You may either want to A: rephrase that, B: learn more about it, or C: go ahead and bet your car on that statement.

At any rate....we're done hijacking OP's thread.
I guess you're right, you don't want to go crazy with gearing in a turbo car because the engine needs load to create back pressure to spin the turbo.

I think when it comes to superchargers it depends on the superchargers type. if it's centrifugal, then gearing really helps you get into the power band, because those don't make as much down low. If it's roots, or twin screw, it's more about making sure you don't shift into OD before the 1/4 mile. here they have an Optimum Rearend Ratio Calculator http://www.hotrodpitstop.com/tools.html#6

Edit: using that calculator, as long as i'm using it correctly (1:1 trans ratio for third gear, and 0 converter slip because it's locked in third, 6500 rpm, and 115 mph) your optimum rearend ratio is 4.37. so 4.10 might be good, but 4.30's would be better

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Last edited by [email protected]; 10-12-2010 at 12:53 PM. Reason: changed RPM
post #15 of 21 (permalink) Old 10-12-2010, 01:34 PM
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Quote:
Originally Posted by 95xbird View Post
Lower ET is fine. I'd like to at least get 115mph though in the 1/4. I just wanna know if the 4.10's are going to be beneficial on a SVO car.
you won't gain anywhere near 10 mph with a gear change.
In fact, the better you hook, your trap might go down...

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post #16 of 21 (permalink) Old 10-12-2010, 04:54 PM Thread Starter
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Quote:
Originally Posted by _95badbird View Post
you won't gain anywhere near 10 mph with a gear change.
In fact, the better you hook, your trap might go down...
This I know, More spin creates a higher trap. Im just saying I wanna do 115 through the traps. I know gears wont do that for me. But if gears will help me run a faster time then I'll go for it.

If I could find 4.30 gears I would rather go that route. But 4.10's should work nicely.

04 PI swap,SVO Supercharger 8-9 psi,Alcohol injection,39lbs Cobra injectors,XCal2-Walbro 255 LPH fuel pump,4.10 T-Lok,2003 4R70W built to withstand by RobertP,450hp JMOD,3800 circleD stall,trucool 4739 Trans Cooler,Dynotech 3.5 Driveshaft,70mm T/B,SCP Cold Air Intake,90mm LMAF,JBA headers,Magnaflow Midmount,No cats with 3inch piping,Vogtland 1.6inch drop,Cobra R's and xenon body kit.

Its slow, Really.
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Parts FOR SALE http://forums.tccoa.com/showthread.php?t=132585
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post #17 of 21 (permalink) Old 10-12-2010, 04:55 PM
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Quote:
Originally Posted by 95xbird View Post
This I know, More spin creates a higher trap. Im just saying I wanna do 115 through the traps. I know gears wont do that for me. But if gears will help me run a faster time then I'll go for it.

If I could find 4.30 gears I would rather go that route. But 4.10's should work nicely.
gotcha

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post #18 of 21 (permalink) Old 10-20-2010, 12:55 PM
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Quote:
Originally Posted by 95xbird View Post
This I know, More spin creates a higher trap. Im just saying I wanna do 115 through the traps. I know gears wont do that for me. But if gears will help me run a faster time then I'll go for it.

If I could find 4.30 gears I would rather go that route. But 4.10's should work nicely.
I just got a set of ford racing 4.30's for $205. I don't know if I would go that high on a blown car though. 4.30s and an svo are going to be a nitemare on the rear end and also on your 60ft times.

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post #19 of 21 (permalink) Old 10-20-2010, 03:36 PM
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IMHO 4.10 is as high as I would go, And Mine seams to get faster. & faster .I guess my trans & top end is getting broke in . Very pleased with how this SVO runs
LOL no, it's because the air is getting cooler and I'd venture to guess that you're still getting use to your new 3.73's.

Good luck at Rockingham! I wish I could make it this month. It will be November before I can join you guys down there.

To the OP. Hans runs 4.10's and RobertP just switched to 4.10's with his Vortech. I'm considering 4.10's too. It's not that big a jump from 3.73's. Like Darren said; I wouldn't go any higher than 4.10's with a SVO.

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post #20 of 21 (permalink) Old 10-20-2010, 06:44 PM
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Quote:
Originally Posted by Toombs View Post
I'm a bad person to ask....

I geared mine so the RPM was where I wanted it going through the traps. I can deal with driving it with that gear. I don't know what your car runs, or what you think your useful RPM limit is, but I'd start with that info, and adjust the gear to put you there in a quarter mile. Just my .02.

Mike
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post #21 of 21 (permalink) Old 12-18-2010, 06:09 PM
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for every .25 gear ratio change, the rpm's will change by 300
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