The manual transmission fill plug location on a 2006 Chevy Colorado is
on the top of the transmission case. However, there's no single, universally-agreed-upon description of exactly *where* on the top. It's typically towards the
rear of the transmission, but you'll need to consult a repair manual specific to your truck's transmission type (e.g., 5-speed, etc.) for a precise location. A picture in a repair manual will be the most helpful.
Important Note: Before attempting to find the fill plug, be sure to locate the drain plug first. This is usually much more readily visible and helps orient you to the overall location of the transmission case. Also, be aware that working on a transmission requires mechanical skill and appropriate tools. If unsure, consult a qualified mechanic.
