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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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