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Follow the manual. Its very straight forward. Check you transmission model number before you start. Order a gasket, oil seals, and blanking plates before you start. The tranny was my first argo project. The manual is very clear on removal, and splitting the tranny. I didn't disassemble the differential unit, as my problem was on the reverse idler shaft. Take Pictures as you take it apart, and ay attention to the orientation of the gears. I wouldn't try it without a service manual in hand.
I did mine with only simple tools, and the parts manual drawing. Make sure you have a freezer available, and a bearing heater (hot plate with a piece of sheet metal on it). You will need to take the differential apart to get all the bearings changed. None of it is hard to do. Just be patient and take your time. Don't force anything because stuff is expensive if you break it.
I ordered gaskets and gears from our local argo dealer. I have one of the early transmissions (CHK Series) and was scared parts wouldn't be available. I didn't really like the price but what I needed was available, so ya gotta pay to play. Bearings, Oil Seals, and Blanking plates I ordered from a local industrial bearing supply. Gears are pricey, $100 for the reverse idler gear here, I didn't price out the rest.
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