Hummer Diff Trouble

I recently purchased the Tamiya Hummer. Building the model went well, but the rear differential keeps coming loose. This leaves me with only front-wheel drive. I have taken the diff apart after each run. After reassembly, 4WD works fine, but after a little while, I notice that only the front tires grip. What can I do to prevent this from happening? [email] HECTOR S100

I've seen just about everything that can go wrong with Tamiya's Hummer and similar Manta Ray/TAo1-2 cars, but I've never had a slipping rear cliff. Tamiya's ball cliff is oriented so that its rotation would tend to tighten the cliff, if anything.

You say that you've rebuilt the cliff a few times. Are you installing the thrust washers correctly? for the cliff to operate property, they must be properly stacked. Rebuild the cliff one more time, paying close attention to the order and position of the parts. Before you install the cliff nut (MATS), clean all grease off its threaded portion and apply a drop of medium-strength Loctite (the blue stuff). Tighten the nut fully, using an Allen wrench to hold the outdrive, as shown in the manual. The cliff should stay tight.

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