However, most people are not aware of the less common six-lug, semi-floating version of the 14-bolt axle. GM called it the "9.5" 14-bolt (after its ring-gear diameter) and offered it exclusively in light-duty 3/4-ton pickups built between 1986 and "93. While not as strong as its eight-lug cousin, the semi-floating 14-bolt rearend does sport some noteworthy attributes. For instance, the all-important width measurement from wheel mounting surface to wheel mounting surface is 67 inches-perfect for most 1/2-ton pickups. Generally, you wouldn"t even need to change mounting brackets to bolt this housing right into the rear of a 1/2-ton GM pickup because the leaf spring architecture is identical. We like the fact that the ring gear measures out at a healthy 9 1/2-inch diameter, and the 33-spline axleshafts have a 1.370-inch diameter-a sure improvement in strength over the typical 1/2-ton shafts. This less grown-up version of the 14-bolt may not have the extra pinion support bearing of its eight-lug cousin, but it"s rated to handle 5,000 lb-ft of torque, so it"s no lightweight either. Moreover, aftermarket suppliers such as Randy"s Ring and Pinion offer all the upgrade goodies you need to make this rear end survive with up to 37-inch-tall rubber. As a result, owners of virtually any GM 1/2-ton pickup offered with six-lug wheels can benefit greatly from a semi-float 14-bolt axle upgrade.
Here is the kicker: Thanks to the semi-floating design, a factory-style wheel will bolt right up. This means you do not have to spend your hard-earned cash on eight-lug wheels to get vast improvements in overall axle strength. We think these axles are the cat"s meow for trucks equipped from the factory with 10- or 12-bolt rear axles.
JD IIRC 9.5" were 6 lug semi floaters GVW 7700lb, GAWR RR around 5000 or 5200 lbs. 10.5" were 8 bolt full floaters. I think those were commonly at 8600GVW and 6000lb GAWR RR.
Then Dana 60/70 were in the 3500 series. These had 6000lb GWARR. 8600 GVW
Later I think the 3500 went to a 9200GVW still with a 6000 axle rating. I use to have all this info, but pitched it about 10 years ago, thinking I would never look at it.
Not sure my numbers are correct, maybe someone else can verify them.
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