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Old 05-09-2008, 05:04 PM   #1
Scrfc69
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Default 3.8l ford racing differential

what exactly does a differential do? i'm just trying to increase the most hp and torque i can for the cheepest
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Old 05-09-2008, 05:15 PM   #2
NYstang
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Default RE: 3.8l ford racing differential

It doesnt increase power. It makes it so both wheels will spin,instead of just the passenger side one. they are best used when combined with a set of gears- generally, the rule for gears is 4.10's for auto, 3.73 for stick. a Track lok differential and set of gears will make it seem like you gained 50 horsepower on the butt dyno.
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Old 05-09-2008, 06:37 PM   #3
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Default RE: 3.8l ford racing differential

yea actually to answer his question a differential is the big round thing on your rear axel and the drive shaft goes into it and transfers the power into the axels a stock one makes the drivers side spin but NY told you what and after market one does so listen to himon that part
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Old 05-09-2008, 07:28 PM   #4
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Default RE: 3.8l ford racing differential

what will a t-loc feel like without the gears because im not going to get 4.10's on my auto simply because i dont need them robbing my gas with a gallon at $3.70
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Old 05-09-2008, 07:56 PM   #5
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Default RE: 3.8l ford racing differential

wont feel like anything different- youll have more traction in a straight line, and it will be more tail happy in the curves, but otherwise not much.
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Old 05-09-2008, 08:51 PM   #6
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Default RE: 3.8l ford racing differential

its a 2 mpg dropif your that concerned go buy a civic
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Old 05-09-2008, 08:56 PM   #7
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Default RE: 3.8l ford racing differential

f*** that there is no way i am buyinga rice burner no way. id rathersuffer the gasmoney that run around town with a 4 banger and a coffee can on the end of my tailpipe. =>
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Old 05-10-2008, 01:16 AM   #8
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Default RE: 3.8l ford racing differential

It speens both wheels. Go with 3.73s and you will wake up the car. Also get a motive bearing kit when installing gears(GO WITH FORD RACING) MOTIVES FTL.
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Old 05-10-2008, 02:38 AM   #9
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Default RE: 3.8l ford racing differential

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ORIGINAL: fordforlife0225

f*** that there is no way i am buyinga rice burner no way. id rathersuffer the gasmoney that run around town with a 4 banger and a coffee can on the end of my tailpipe. =>
lol, i dont get it, dont they knowhow ridiculous that looks?
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Old 05-10-2008, 02:58 AM   #10
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Default RE: 3.8l ford racing differential

Quote:
ORIGINAL: eddiev22

Quote:
ORIGINAL: fordforlife0225

f*** that there is no way i am buyinga rice burner no way. id rathersuffer the gasmoney that run around town with a 4 banger and a coffee can on the end of my tailpipe. =>
lol, i dont get it, dont they knowhow ridiculous that looks?
No, they actually think it looks cool!! More on the original subject, the gears are a must, I've seen fast rides only run 14.0's High 13's all because of the stock gearing. If you can't get the rpms up fast enough, it doesn't matter how much hp is at the crank, your just not going to run a great number. The higher the number (4.10's 456's 530's) the lower the gear, The lower the number (3.08's 323's 355's) the higher the gear. The trade off for lower gears is a lower top speed (little more gas), but you are only going so fast in the quarter anyway so that's not a factor. You need that low (gear) end power to get flying through the rpms instead of a steady climb like the 3.08's or worse. For example, with my stock rearend (95 single port) I would only be able to get to 3rd gear (5 speed) in a quarter because of the high freeway gear ratio. This is the reason why the single port 5 speeds do well on gas mileage. I have to go 80mph on the freeway just to hit 2k on the tach. The point is, you might not gain horsepower per se, but it will feel like you did. If you have ever tried launching hard in a slow single port or split port, the right tire will just spin until you shift to second which is no good for ET's.

P.S If you like the technical information, here is a small article, explains ratios, tranny gears, tire size, etc.. What's in a Ratio?An automobile uses gear ratios in both the transmission and the drive axle to multiply power. The two ratios multiplied together equal the final drive ratio. Spend a few minutes in any bench-racing session and soon you'll hear rear axle gear ratios discussed. For many performance cars, 3.73s and 4.10s are common gear choices. The rearend gear ratio refers to the relationship between the ring gear and the pinion gear. By simply dividing the ring gear tooth count by the pinion gear tooth count, the ratio is determined. For example, if we divide a ring gear with 41 teeth by a pinion gear with 10 teeth we find that the gear ratio is 4.10:1 (41/10 = 4.10).Tire diameter will also have an effect on a vehicle's final drive ratio. As tire diameter changes, so will engine rpm at a given speed. We can demonstrate this with the simplified formula: rpm = (mph x final gear ratio x 336*) / tire diameter (*see "Formulas for Success" sidebar). For example, given 65 mph, a tire diameter of 30 inches, and a final gear ratio of 4.10, the engine speed will be approximately 2,984 rpm--(65 mph x 4.10 final gear ratio x 336) / 30-inch diameter tire. If we reduce the tire diameter to 25 inches, the engine speed increases to 3,581 rpm. By installing shorter tires, the vehicle will accelerate as though it has a 4.73 (higher numerically) gear without the expense of gear swapping.Because transmissions are comprised of several gear choices, the transmission allows the vehicle to accelerate quickly with lower gears and to maintain a cruising rpm using higher gears. In the '60s and '70s, most transmissions offered three or four gears with a 1:1 high gear. Using a TH400 as an example, First gear is 2.48:1, Second gear is 1.48:1, and Third gear is 1:1. Multiplying the 2.48 First gear by the 4.10 rear axle results in a final drive ratio of 10.16:1 (2.48 x 4.10 = 10.16). For most street performance applications, a 10:1 final First gear ratio is usually considered optimal. The disadvantage of operating a 4.10:1 axle ratio on the street with a 1:1 high gear is excessive freeway engine speed.Fortunately, today's transmissions frequently utilize Overdrive high gears in the neighborhood of 0.70:1, which allow reduced engine speeds. Combine these overdrive transmissions with a 4.10 axle ratio and you have a fuel-friendly final drive ratio of 2.87:1 (4.10 x 0.70 = 2.87) in high gear. A TH200-4R overdrive automatic utilizes a First gear of 2.74, a Second of 1.57, a Third of 1.00, and a 0.67 Overdrive. With this transmission's First gear ratio of 2.74 combined with a 3.73 axle ratio, the final drive ratio >> yields a 10.22 (2.74 x 3.73 = 10.22). In overdrive, the final drive ratio equates to a Bonneville-ready 2.49:1.
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