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By my parts book, MF 135 Standard, vineyard, and Deluxe only came with outside mounted dry drum brakes. Orchard came with disk brakes apparently mounted inboard of the sun and planet gear reduction units. They do show only a couple main housings, original and replacement. They do show only two sets of pinion, ring, and differential cases. Light and heavy, without individual part numbers at least for the deluxe, vineyard, and special. But there's still a dozen different bevel differential gears to choose from to match different axles. It may be possible, but darned difficult to add differential lock with a parts tractor 6 years different in age. It would be a whole lot easier to learn to drive with the brakes not locked together so a spinning wheel could be choked rapidly to put power to the wheel with traction. The differential lock pedal got loose on the shaft once and it depends on the spring on the pedal to pull the clutch jaws apart. It sure was a pain driving hauling gravel in the loader around corners with the differential locked. Gerald J.
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