![]() Does weigh about 25# more than the 12-bolt though. But both cars were still selling relatively well. Even lower mechanical losses (5%) and beefier than the 12-bolt or 9-inch in "basic" setup. Both the Firebird and its General Motors cousin the Camaro did a rare thing in 1969 and underwent significant restyles even though a full restyle was coming the following year. That is a rework of the beefy Dana 60 rear. A buddy of mine was running 1,350HP through a Moser 9-inch, but it was a $4,000 setup.Īnother rear axle to look at is the "Strange S60". Once you approach 1,000HP, the 12-bolt is overstressed, and you have to start moving up to more expensive options on the 9-inch. In a "basic" configuration, the 12-bolt and 9-inch have similar strength. It's very easy to know what type of differential is on your car, just stop on the bottom side of the road with a wheel on the asphalt and the other in the ground/grass/gravel. higher mechanical HP losses (10%) compared to the 12-bolt (7%). 67-81 REAR AXLE Two things to know, the final drive ratio and type. For stronger axles, you need a locker or a spool - not street friendly I think that you can only get a limited slip type differential up to the 31-spline axle configuration. pinion is 3/4" lower than the typical 10-bolt or 12-bolt, adding yet another complication to the driveshaft angle and getting the pinion angle set correctly. It is offset to the drivers side of the car, putting the driveshaft at an angle. There is also a number on this same area, it is the number ' I 2 9 8' along with a casting clock which points to the number 7. Good for adapting to changing track conditons, but not a real advantage for a street car. The GM pinion case casting is 1254333, this number was taken from the Pinion part of the case casting, on the drivers side of the case. The Ford 9-inch is also a great rear, particularly the ability to quickly swap gears, simply by pulling the carrier/front cover assembly, and changing to a new assembly with a different gear ratio. I wouldn't hesitate to use one behind your engine. I have a Strange 12-bolt behind my 800HP/800t-lb nitrous motor, and when the car still had the manual trans and a twin-disc McLeod Street Twin, the 12-bolt handled 5,000RPM clutch dumps on slicks with no problem. ![]()
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