I once owned a 1420 and if I recall it had the same rear in it. I had a similar problem. My difficulty was on the gear side of the tranny. One of the gears, I believe it was the differential gear had 4 bolts through it and those bolts would work loose and fall into the gears locking everything up and breaking gear teeth in the process. I had tried loctite which did not work. As a last resort I spot welded those bolt heads and even that broke and I was rid of that machine. The dealer said that tranny was a poorly engineered rear and was just junk.
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With my son, EricR Super 2084 with 54" mower, 451 blower. 2086 with 3 pt hitch, 54 inch deck, 551 blower, 54 in brinly blade. A 4 digit original w deck. A 70 with deck. 2 102s both with 42 in decks, one with creeper, 1 36 inch IH snow thrower CW36, 1 42 inch IH blade. 149 with mower. 2072 w 3 pt hitch, Johnny bucket, 60 in mower, 451 blower. Jacobson GT 10 with mower. DR Lawn vac tow behind,Home made lawn roller. Brinly cart, 2 off brand carts and 1 home made cart.
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