I just did the front and rear Diff oils and the Gearbox and Transfer case fluid changes on the GQ, the Diff Oil is ridiculously thick and bloody hard work. I bought one of these a couple of years ago and dont pull it out often but bloody Hell! Game Changer mate! It made very short work of it.
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I had a small one and it was Horrible to use, i think mine is a 2lt one. Awesome. When you need it you need it.