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Just a couple days ago, Kyle busted a Yukon cryo treated 529 gearset. The time frame for me to set up this
one for Kyle was close but doable before next weeks event would start.
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This is the new Yukon 529 that has been both heat-treated and chilled down to about -300F.
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...
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I loaded a .078" shim on the V6 pinion and .022" on the solid collar.
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This gave me 10 in/lb for pinion pre-load using the electric impact for tightening the pinion nut.
I know from previous experience that when I go to do the final tightening at the end, that my 4 foot cheater
bar will compress the soft pinion shims just a little bit more giving another 5 in/lb of additional pre-load...
so my real PPL will be 15 in/lb final and that is good with me knowing the way Kyle is going to use his comp truck.
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The ARB had some rough spots on the flat surface and the file took care of that.
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Usually my file will not bite into the ring gear very well due to the hardness factor but because these are softer, I
noticed the file had more effect.
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The usual red Loctite and 75 ft/lbs....
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With the backlash at 7.5 thou and carrier bearing pre-load (CBPL) set high, I was
able to get a very nice drive side load bearing pattern.
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Coast was ok, too.
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I date coded the ring gear. I set the CBPL extra high for kyle (150 ft/lbs) while maintaining the prescribed 7.5 BL.
Although 150 ft/lbs on the spanner rings sounds terribly high, it is not and translates into an actual 15
inch/pounds of CARRIER BEARING pre-load which is a desired spec to shoot for.....even for a daily driver.
What would really be cool is to use a set of cryo treated (without the heat
treat portion) carrier bearings....the CBPL would stay high for a longer period of time. The same could be said of the
pinion bearings, also.
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A new pinion seal with some gear oil to prevent a dry start-up...
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The pinion nut gets additional tightening power that the electric impact cannot quite deliver.
I have never damaged an 8" pinion nut yet.
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...
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Because Kyle is using this in comps, I recommended for him to use a good high shock 140 weight gear oil. I told
him to give it hell, too. ;) ZUK
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