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Crush collar won't crush

4811 Views 9 Replies 5 Participants Last post by  kacp-o
Putting together a 12 bolt. Put in a new Ratech #3111 crush collar and got up to 300 ft/lbs on the pinion nut and couldn't get more than 10 in/lbs of preload. Was afraid to go any further for fear of stripping pinion nut. Took out that crush and got new one from Strange. Compared the 2 with a mike and the Raytech was .020" longer. Put in the Strange and got the recomended 18 in/lbs preload at 160 ft/lbs on the pinion. Anybody run into this?
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I prefer to use GM parts when possible. I have had problems with Ratech crush spacers before. I had one split right down the seam. Had to disassemble the rear end again to change it. There are some that are only made by Ratech, so you don't have a choice. The Strange spacer was probably a GM spacer. I'd like to see more than 160 foot pounds of torque on the nut. That just isn't quite enough. Should be at least 200 or more.
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