I have a 2002 TJ Wrangler with a 4.0 inline 6 with a 5-speed manual transmission. My jeep has 154000 miles on it. To remove the fill plug in the drain plug it is a 17 mm hex on a half-inch drive. I'm going to use 75w140 full synthetic gear oil. The pump works good but it's a little more messy and you have to keep the hose clean before you refill the transmission. Sorry I wasn't doing a how to I was just showing what socket to use and what kind of fluid I am using. But it's a very simple process. I would say even easier than doing a oil change.
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