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Saturday at work, I get a call. It's Flex on his cell and he busted the front non-cryo'd 571 that I set up for him 2 years ago. He was on a waterfall on a "trail" called Over-dose in Florence, AZ. Fortunately, I had a high quality 571 Precision on the shelf. I had him bring it over that night and in about 2 hours he leaves with a good 3rd. Follow this link to see how the build went on that one 2 years ago. |
Flex has been running diffs built by me very hard....the rear Precision 571 is cryo-treated and has the stronger chrome-moly axles. The front was a 571 US GEAR....not cryo'd. The front axles are the deluxe Bobby Long 30 spliners. The tires are 40"....4.3L Vortec...TH350 automatic...4.7 transfer case. |
Pinion pre-load still ok... |
Looking at the coast pattern from 2 years ago, the Precision brand gear just seems to have a sweeter classic painted pattern. |
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Not much time for extensive pics....Flex still has to re-install this 3rd tonight and do a trail in the morn...if you can call it a trail :) I set pinion pre-load to 10 in/lb.... .075" pinion shim for depth....backlash a little tight at .006" but plenty of room for good lubrication. CBPL holding at 125 ft/lbs. In the pic above, depth is deep by 2 thou. I'm not going to say for sure that that adds to more strength 100% positive.....because I am not positive....but I don't think it will hurt him a bit, in this case. |
Coast side....is much closer to the stronger root of the tooth than the coast pattern on the US GEAR from 2 years ago. Flex was running hard on the coast side when he busted. |
...making sure that "ring gear deflections" will be at an absolute minimum. Backlash kept tight at .006" but never tighter than that to avoid starving the ring for gear oil. |
Putting my new mark next to my old one. |
arrr....here ya go Flex. It's not cryo treated but it is an excellent quality gear and it did set-up VERY well. PRECISION gears rule! Have fun! ZUK |
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