I agree with Owen. The main shaft should be shimmed to position the pinion to be properly meshed with the ring gear. The total play (front to back in transmissions with a pinion on the output shaft) is usually zero. If the shaft is located by a combination of the front trans bearing, and the rear trans bearing, and they are tapered roller bearings, they must have a tiny bit of preload to prevent misalignment. If the shaft is positioned using thrust bearings, needle or washer type, the end play should be less than .002". Measured on the ring gear (with a dial indicator perpendicular to the outer edge of a tooth on a tangent line), the backlash is close to .003 to .005". Adjustment of this amount is a combination of the above position of the pinion (forward and back) depth, and the side to side location of the differential. The depth should be set so the pinion teeth have full contact with the length of the ring teeth. The differential position is then set to allow only the above mentioned backlash. The depth gives good tooth contact, the side to side sets backlash. There is dramatically more to working with hypoid gears in a automotive differential because the shafts are not aligned in the horizontal plane. The specifications I have given are experience driven, not from the manual. They are intended to help you understand the issue. Let us know how it is going. JimN
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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