This Is What Big Rims Look Good On
Apr 28, 2007 | 11:03 PM
#22
4.56:1 gears are too tall for a 10-bolt powered by a roots or twin screw supercharger.
The pinion gear is so small it only has 9 teeth. With a 4L60-E it's a final drive ratio 13.95:1 in first gear. If you take the torque of your engine at converter stall speed multiplied for the STR ratio of your converter, then the final drive ratio and then take off 15% for driveline loss you will find that the differential is being pushed to something close to 10,000 foot pounds of torque. It's too much for a 10-bolt, simple.
Also, you are going to hear from plenty of pickup guys saying the 10-bolt is plenty strong, but keep in mind they are traction impared in the back. It's not necessarily power that always breaks these, it's traction. I can tell you for a fact that the only chance you have of a 10-bolt holding up in a boosted SUV is to install 3.42 or lower gears into it with a strong aftermarket differential. Any more gear than that and the housing will flex enough under the torque to break the ring and pinion.
Are the differential cover bolts walking themselves out? I would bet they do. That's from housing distortion.
Having the thought of "can I afford to break down here" go through you mind before every time you punch the gas makes all the effort worthless, in my opinion.
The pinion gear is so small it only has 9 teeth. With a 4L60-E it's a final drive ratio 13.95:1 in first gear. If you take the torque of your engine at converter stall speed multiplied for the STR ratio of your converter, then the final drive ratio and then take off 15% for driveline loss you will find that the differential is being pushed to something close to 10,000 foot pounds of torque. It's too much for a 10-bolt, simple.
Also, you are going to hear from plenty of pickup guys saying the 10-bolt is plenty strong, but keep in mind they are traction impared in the back. It's not necessarily power that always breaks these, it's traction. I can tell you for a fact that the only chance you have of a 10-bolt holding up in a boosted SUV is to install 3.42 or lower gears into it with a strong aftermarket differential. Any more gear than that and the housing will flex enough under the torque to break the ring and pinion.
Are the differential cover bolts walking themselves out? I would bet they do. That's from housing distortion.
Having the thought of "can I afford to break down here" go through you mind before every time you punch the gas makes all the effort worthless, in my opinion.
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