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Re: 12 bolt ring and pinion question
Good job! Go easy on it and follow the break in procedure and it will give you many years of trouble free use. Make sure you use the "posi-additive" and change the lube out after the first 500 miles, with the additive. The phosphate coating on new gears actually aids in the breaking in period by helping the gears wear in. Gear howling is often attributed to loose backlash and or the pinion developing end play. You did good! 
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Michael of the clan Hill,
"Two Seventy Two's"
71 1-ton Dually 350 4-Speed
71 C/50 Grain Truck, 350 Split-Axle 4-Speed
02 3/4 ton Express
14 Indian Chief Vintage
1952 Ford 8N, "Only Ford Allowed On The Property"
"Be American, Buy American" 
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