Probably the easiest 12-bolt differentials to find are the type 2 units. These are found primarily in standard-performance Chevrolet passenger cars. Type 2 ratios were somewhere between 2.29:1 and 2.73:1.
How do I know what gear ratio my 12 bolt?
12-bolt axles can be identified by casting numbers on the bottom of the cast-iron center-section and on the front of the passenger side axle tube. This identifies the car make and model, gear ratio, date of casting and assembly and factory of origin.
What ring gear size is a GM 12 Bolt diff?
12-Bolts to Glory The GM 12-bolt debuted in 1965 and was mass-produced until 1972. It features an 8.875-inch ring-gear carrier held in place with two internal main caps. The pinion gearshaft measures 1.625 inches in diameter and is shimmed to achieve the proper pinion depth.
What’s better 10 bolt or 12 bolt rear end?
First, the 10-bolt’s pinion shaft diameter is 1.438 (25 splines) while the 12-bolt is 1.625 (30 splines) which makes the 12-bolt 13 percent larger in diameter and therefore stronger.
What is a 12 bolt rearend?
The 12-bolt positions the pinion-gear higher on the ring gear, which reduces the load on the pinion. This results in less parasitic loss from the friction caused as the gears mesh. Introduced in 1964, the 12-bolt rearend became a staple for Chevrolet racers.
What size is a GM 12 bolt rear end?
The GM 8.875-inch, 12-bolt positraction came in many 1965 to ’72 passenger cars. The pinion shaft on passenger cars’ differentials was 1.625 inches in diameter, and the cover was oval, measuring 10.9375 inches wide by 10.625 inches tall.
How many teeth does 4.10 gears have?
Example: 4.09 / 4.10 / 4.11 Gear Ratios
|Axle||Ring Gear Teeth||Final Ratio|
|GM 10.5″ 14 Bolt||45||4.09|
How do I know my diff ratio?
Rotate the marked tire one revolution while counting how many times the driveshaft rotates. eg, If your driveshaft made 3 3/4 revolutions, that would determine a 3.73 gear ratio. If you get approximately 2 3/4 revolutions, you have a 2.76 gear ratio.
How do you find the rpm of a gear ratio?
The general rule is – large to small gear means ‘multiply’ the velocity ratio by the rpm of the first gear. Divide 60 teeth by 30 teeth to find the velocity ratio. Multiply this number (2) by the rpm (120). This gives an answer of 240rpm.
How many quarts is a 12 gauge bolt?
Registered. A 12 bolt should only take around 3 quarts until it comes out the fill hole.
What is the difference between a car and truck 12 bolt rear end?
They are two different rear ends, and the car is better in nearly every way. If I am not mistaken the 8.5 10 bolt is stronger in more ways too then the truck 12 bolt. The only things that make’s the 8.5″ &
the Car 12-bolt stronger is the larger pinion stem diameter &
only seen one break.
Did Pontiac make a 12 bolt rear end?
Although Buick, Pontiac and pre-’67 Oldsmobiles used the same basic 8.2-inch 10-bolt differential (1967-’70 Oldsmobiles used the Olds-specific 12-bolt 8.5-inch differential), these are different from the Chevrolet 8.2 10-bolt offerings.
Is posi traction the same as limited slip?
Despite the fact that a lot of folks confuse the terms “posi” or “Positraction” with “limited slip,” the fact is that the two are basically one and the same. Today, all positive traction systems are referred to as limited slip systems.
How much horsepower can a 8.2 10 bolt handle?
Roughly 550 to 600 HP total. No slicks, drag radials. No problems with the 8.2 at all. I used the stock diff., the Auburn would be better.
What is the strongest rear end?
Dana 60 Rear End Assemblies
If you want a big brute of a rear end under your car, look no further than a Dana 60. Even in the heyday of muscle cars, Dana 60 rear differentials were renowned for their strength, along with their difficulty to locate.
Who makes Chevy rear end?
Rear ends with measurement designations are named after the diameter of the ring gear, i.e. 7.2 and 8.5 inch. As Chevrolet used many different rear-end models throughout the years, casting codes vary in both location and translation. Information given is for GM-manufactured rear ends.
How do you find the gear ratio on a Chevy Silverado?
Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box.
What rear end came in a 57 Chevy?
Automatic 57 cars (both 6 and V8) came with 14inch tires and 3:36 rear gears. Stick shift 57 cars came with 14 inch tires and 3:55 gears.
How do I identify my GM axle?
Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox. Whenever possible, reference the tag numbers when ordering parts for your Differential.
How many teeth does 3.55 gears have?
|Model||Motive Gear D35-355 Rack and Pinion, 39-11 Teeth, 3.55 Ratio|
|Item Weight||11.44 pounds|
|Product Dimensions||15.5 x 11 x 5.25 inches|
Are 3.73 or 4.10 gears better?
4.10 is the typical gear ratio for a high-performance vehicle like a sports car or SUV because it provides better acceleration than 3.73 because of the faster second and third gears, which provide more torque at lower speeds to accelerate from a stop.
How many teeth does a 3.73 ring have?
Richmond Ring &
Pinion Set – 3.73 Ratio, 41-11 Teeth, GM 10 Bolt “New Style” (70-94)
What is the best gear ratio for torque?
indeed Does gear ratio affect horsepower? A higher numeric axle ratio (4.11:1) keeps the engine running in the higher horsepower range, thus improving performance.Are 3.73 or 4.10 gears better?
|3.73 Ratio||4.10 Ratio|
|Lower Torque||Higher Torque|
|Better Gas Mileage||Decreased Gas Mileage|
|Higher Top Speed||Lower Top Speed|
What gear ratio do I have f150?
Write down the number in the lower left-hand corner of the tag. It will look like “3.23” or “3.50.” This is the gear ratio.
Can you tell gear ratio from VIN?
The Vehicle Descriptor Section (VDS) of the VIN will carry information for the gearbox ratio if the specific manufacturer includes it. If not, you might need to take help from a trusted VIN decoder website or find out manually.
Which gear has highest speed reduction?
Worm gears are perhaps the most costeffective reduction solution, but usually have a minimum 5:1 ratio and lose considerable efficiency as ratios go higher. Bevel reducers are very efficient but have an effective speed reduction upper limit of 6:1.
What will be the rpm of smaller gear if a 180mm dia meshes with 60 mm dia gear and the bigger gear makes 60rpm?
On substituting respective value in above equation: So: Means speed of smaller gear is 180 RPM.
Does gear reduction increase torque?
The rotary machine’s output torque is increased by multiplying the torque by the gear ratio, less some efficiency losses. While in many applications gear reduction reduces speed and increases torque, in other applications gear reduction is used to increase speed and reduce torque.