Is a 12-bolt rear end good?
When the 12-bolt rearend is properly assembled, it’s the strongest passenger-vehicle rearend Chevy ever produced. GM engineers designed the 12-bolt to be a durable piece that could handle the torque output of its big displacement engines.
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.
Are all GM 12 bolts the same?
They are not interchangeable. That doesn’t mean the truck rearend is not capable of receiving performance upgrades. To the contrary, aftermarket 30-spline differentials and axles are available. GM car and truck 12-bolt rearends are easily distinguishable by the cover shape.
How do I identify my Chevy rear differential?
If the ID tag or stamp is missing or unreadable, differentials can be identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter.
How do I know what GM rear end I have?
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.
Is a Dana 70 better than a Dana 60?
The torque rating for a stock Dana 70 axle shaft is 8966 ft/lbs, which is almost 50% stronger than the stock Dana 60 axle shaft, which has a rating of 6044 ft/lbs.
What is the size of a 12 bolt Positraction differential?
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.
What is a 12 bolt rear end on a GM car?
GM car and truck 12-bolt rearends are easily distinguishable by the cover shape. Most GM trucks from 1961 through 1972 used a rear suspension consisting of two trailing-arms with coil springs. There is an anomaly in that statement though, as leaf springs were an available option.
How do I know if my truck has a 12-bolt differential?
At a quick glance, you can also tell when you’re looking at a truck 12-bolt, because the rearend cover has an irregular shape. Early truck 12-bolts had axles with 12 large axle splines. The differential carriers are also narrower than those in passenger-car units.
Is the strange engineering Chevy 12-bolt rear differential good for drag racing?
Whether you prefer street or strip, building horsepower for your GM F-Body platform can only get you so far in drag racing. Eventually, you’re going to have to get all those ponies to the pavement. That’s where the Strange Engineering Chevy 12-bolt heavy-duty drag race rear differential comes into play.