vettenutchas

I know this is an old post but does anyone know of a current source for 3.90 or 4.10 ring and pinion gears for an 2019 Grand Sport? do all C7's have the same differential?

0todd@rpmtransmissions

Give the guys at the shop a call at 800-406-1109. Shane or Jeremy can help you out!

robert miller

^^^^ For me this is the only vendor in here are else were for a vette trans are rear end set up... Todd you guy will be at LS fest like always.. Robert

Russbruns

Gears are being installed in my GS, hopefully done this week.

phantom1

thrilled

I only had the 4.10 in about 3-4 months before I totaled it but it was a fantastic mod. Never needed 1st gear again. When I had it in 7th it felt like it was in 6. I’m hoping eventually will be able to do the same thing with the C8.

HorsePower Junkie

The C8 won't need it.

The stock gear in the base C8 is 4.89

And the stock gear in the Z51 is a whopping 5.17

Wow, Chevy finally got it right!


.

thrilled

I hope your right HP junkie. I will find out hopefully October.

Russbruns

but then depends on transmission gearing

thrilled

Russbruns. I was thinking the same thing

HorsePower Junkie

HorsePower Junkie

Finally, Chevy got it right!


.

HorsePower Junkie

2.8 second 0 to 60

...now we know why!

...5.17 gears!!



.

c7z06a8orange

The global gear ratio in first gear is over 15 to 1. this is excellent for taking off the line
The difference is all gears ratio a much lower in transmission DTC

c7z06a8orange

Gear Ratio Calculator >>

Gear Ratios Calculator, MPH, Top Speed

This calculator outputs the how fast a car can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

If you like this calculator use the Google +1 button:


Tire Size
(345/30/20) / - OR Tire Diameter
(inches)
Final Drive Ratio Redline (RPM) 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear 500 2.69 4.45 6.42 8.91 11.99 15.41 19.72 23.79 600 3.23 5.34 7.7 10.7 14.38 18.49 23.66 28.55 700 3.77 6.23 8.98 12.48 16.78 21.57 27.6 33.31 800 4.31 7.12 10.27 14.26 19.18 24.65 31.55 38.07 900 4.85 8.01 11.55 16.05 21.58 27.73 35.49 42.82 1000 5.39 8.9 12.83 17.83 23.97 30.82 39.43 47.58 1100 5.93 9.79 14.11 19.61 26.37 33.9 43.38 52.34 1200 6.47 10.68 15.4 21.4 28.77 36.98 47.32 57.1 1300 7.01 11.57 16.68 23.18 31.17 40.06 51.26 61.86 1400 7.54 12.46 17.96 24.96 33.56 43.14 55.2 66.61 1500 8.08 13.35 19.25 26.74 35.96 46.22 59.15 71.37 1600 8.62 14.24 20.53 28.53 38.36 49.31 63.09 76.13 1700 9.16 15.13 21.81 30.31 40.75 52.39 67.03 80.89 1800 9.7 16.02 23.1 32.09 43.15 55.47 70.98 85.65 1900 10.24 16.91 24.38 33.88 45.55 58.55 74.92 90.41 2000 10.78 17.8 25.66 35.66 47.95 61.63 78.86 95.16 2100 11.32 18.69 26.95 37.44 50.34 64.71 82.81 99.92 2200 11.86 19.58 28.23 39.23 52.74 67.8 86.75 104.68 2300 12.39 20.47 29.51 41.01 55.14 70.88 90.69 109.44 2400 12.93 21.36 30.8 42.79 57.54 73.96 94.64 114.2 2500 13.47 22.25 32.08 44.57 59.93 77.04 98.58 118.96 2600 14.01 23.14 33.36 46.36 62.33 80.12 102.52 123.71 2700 14.55 24.03 34.65 48.14 64.73 83.2 106.47 128.47 2800 15.09 24.92 35.93 49.92 67.13 86.28 110.41 133.23 2900 15.63 25.81 37.21 51.71 69.52 89.37 114.35 137.99 3000 16.17 26.7 38.49 53.49 71.92 92.45 118.3 142.75 3100 16.71 27.59 39.78 55.27 74.32 95.53 122.24 147.5 3200 17.24 28.48 41.06 57.06 76.71 98.61 126.18 152.26 3300 17.78 29.37 42.34 58.84 79.11 101.69 130.13 157.02 3400 18.32 30.26 43.63 60.62 81.51 104.77 134.07 161.78 3500 18.86 31.15 44.91 62.4 83.91 107.86 138.01 166.54 3600 19.4 32.04 46.19 64.19 86.3 110.94 141.96 171.3 3700 19.94 32.93 47.48 65.97 88.7 114.02 145.9 176.05 3800 20.48 33.82 48.76 67.75 91.1 117.1 149.84 180.81 3900 21.02 34.71 50.04 69.54 93.5 120.18 153.78 185.57 4000 21.56 35.6 51.33 71.32 95.89 123.26 157.73 190.33 4100 22.09 36.49 52.61 73.1 98.29 126.35 161.67 195.09 4200 22.63 37.38 53.89 74.88 100.69 129.43 165.61 199.84 4300 23.17 38.27 55.18 76.67 103.08 132.51 169.56 204.6 4400 23.71 39.16 56.46 78.45 105.48 135.59 173.5 209.36 4500 24.25 40.05 57.74 80.23 107.88 138.67 177.44 214.12 4600 24.79 40.94 59.03 82.02 110.28 141.75 181.39 218.88 4700 25.33 41.83 60.31 83.8 112.67 144.84 185.33 223.64 4800 25.87 42.72 61.59 85.58 115.07 147.92 189.27 228.39 4900 26.41 43.61 62.87 87.37 117.47 151 193.22 233.15 5000 26.94 44.5 64.16 89.15 119.87 154.08 197.16 237.91 5100 27.48 45.39 65.44 90.93 122.26 157.16 201.1 242.67 5200 28.02 46.28 66.72 92.71 124.66 160.24 205.05 247.43 5300 28.56 47.17 68.01 94.5 127.06 163.32 208.99 252.19 5400 29.1 48.06 69.29 96.28 129.46 166.41 212.93 256.94 5500 29.64 48.95 70.57 98.06 131.85 169.49 216.88 261.7 5600 30.18 49.84 71.86 99.85 134.25 172.57 220.82 266.46 5700 30.72 50.73 73.14 101.63 136.65 175.65 224.76 271.22 5800 31.26 51.62 74.42 103.41 139.04 178.73 228.71 275.98 5900 31.79 52.51 75.71 105.2 141.44 181.81 232.65 280.73 6000 32.33 53.4 76.99 106.98 143.84 184.9 236.59 285.49 6100 32.87 54.29 78.27 108.76 146.24 187.98 240.54 290.25 6200 33.41 55.18 79.56 110.54 148.63 191.06 244.48 295.01 6300 33.95 56.07 80.84 112.33 151.03 194.14 248.42 299.77 6400 34.49 56.96 82.12 114.11 153.43 197.22 252.37 304.53 6500 35.03 57.85 83.41 115.89 155.83 200.3 256.31 309.28 6600 35.57 58.74 84.69 117.68 158.22 203.39 260.25 314.04 RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear


Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.


Read more: http://www.dragtimes.com/2012-Chevro...#ixzz6G73TutZ7