Q. How do I know what rear differential I have?
Without an ID tag, differentials are identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.
Q. How can you tell the difference between a 7.5 and 8.5 rear end?
Hey monte-ss, one really good way of telling the G-BODY 8.5″ over the 7.5″ is to look right below the pan of your 7.5″ rear and you will see some extensions that look like nipples. The 8.5″ rear has larger extensions that are 90 angled verses nipples.
Q. How do I know if I have a 12 bolt rear end?
The easiest way to identify a 12-bolt rearend is obviously by the 12 bolts holding the rear cover onto the axle housing. The pinion shaft on passenger-car differentials is 1-5/8-inch in diameter and the cover is oval, measuring 10-15/16-inches wide by 10-5/8-inches tall.
Q. What is the difference between a locker and posi?
With a locker both wheels will spin at the same speed. With a posi it allows the wheels to turn at differenthe speeds. When turning the inside wheel needs to turn slower than the outside .
Q. What is a 12 bolt rear?
In actuality, the term 12-bolt is due to the 12 bolts holding the ring gear to the differential. The coil spring mounts and the mounts for the upper trailing arms on the differential identify this as a Chevelle or Monte Carlo rearend, not one from a full-size car like an Impala.
Q. How much does it cost to rebuild a 12-bolt rear end?
If you want a complete rear end rebuild then it will cost much more. Figure around $1200 to $1500 for new parts and labor. Gears, installation kit, clutches, axles and labor.
Q. What is the difference between a 10 and 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. The 8.2 uses a 28-spline axle (1.20 inches in diameter) while the 12-bolt uses a 30-spline axle (1.625 inches in diameter).
Q. 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.
Q. How do I identify a GM 7.5 rear end?
Although the 7.5-inch 10-bolt closely resembles the 8.5-inch housing, you can positively identify the Chevy 7.5-inch rearend by measuring it. The oval-shaped cover measures 8 5/16 inches by 10 9/16 inches. The distance between the bottom center bolt in the cover and its adjacent bolts is 3 1/4 inches.
Q. How wide is a Chevy 10 bolt rear end?
10-15/16-inches
Q. What is the width of a 1955 Chevy rear end?
Products specifications
| Vehicle Fitment | 55-57 Chevy Tri-5 (150, 210, Bel Air and Delray ) Call for Station Wagons, Nomad and Sedan Delivery |
|---|---|
| Brake Space | 2.5 inches (axle standoff) |
| Width | 60 inches (between wheel mounting surfaces) |
| Fluid Capacity | 3 quarts of 85w-140, non-synthetic (API GL-6 rated only) |
Q. What gear ratio is a G80 rear end?
GM RPO Codes – Factory Identification Labels and Interpretation
| RPO Code | Description | Ratio |
|---|---|---|
| G76 | Positraction Rear | |
| G80 | Axle Positraction, Limited Slip | |
| G81 | Positraction Rear Axle | |
| G82 | Axle Rear | 4.56 |
Q. How much power can a 8.5 rear end handle?
500 hp
Q. How do I know if I have Positraction?
The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential. If it spins in the same direction, you have a limited slip differential, or LSD.
Q. How much horsepower can a 28 spline Ford 9 inch handle?
Q. Why is the Ford 9 inch rear end so popular?
Besides an inherently large ring-gear diameter (bigger than all competitive passenger-car performance rearends, except the massively heavy and relatively rare 9-inch Dana 60), the Ford’s biggest strength advantage over competitive rearends is its greater hypoid distance.
Q. How much power can a 12 bolt handle?
The 12 bolt is usually good to around 600 HP. You should be fine with it at 500 HP and the automatic.
Q. How much HP can 30 spline axles handle?
A 30-spline axle is rated at 6,200 lb-ft, a 31-spline at 7,000, a 33-spline at 8,200, a 35-spline at 9,600, and a 40-spline at 12,000. As long as the figure from the formula is smaller than the torque rating of the axle, you’ll be in good shape.
