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I have one of these gears that I purchased at $129 for my Lippert Happijac bed lift (2013 Attitude 34’) that ended up not being needed once disassembled. My issue ended up being the horizontal chains across the top that attach to the gears for the vertical lift rails. The horizontal chains were SO loose from the factory, which do not have any adjustment on them, allowing them to skip on the gear causing the bed to get out of wack on each corner. I made a set of chain tensioners and adjusted the vertical chains to ensure the issue was resolved. When I find some time I will do a thread on my issue vs the gear failure issue. Once apart I realized my gear from the factory was already an aluminum gear. (See pic of far right gear in GB) With that said, I no longer need the gear I purchased and will sell it for $75 to the first buyer. My recommendation, if you are having an issue is to pull the motor and gearbox first as to ensure it fits your model as there seemed to be a slight differences in this gear and mine without removing mine from the shaft. (Same size and # of teeth but mine looks to not have the keyway running completely through the gear. May still have worked but did not want to disassemble my good gearbox any further than needed. Lots more pics available that I will try and put together in another thread and come back here to update with a shortcut. Tozlakes