Originally Posted by
timsrv
Yes, it's true that getting a good reading can be troublesome. The fluid is thin (hard to see) and false readings are hard to avoid. I normally don't use the "cold" mark unless it's the initial servicing of an empty transmission (just to get "in the zone"). After vehicle has been warmed up and driven fluid level is adjusted to the "hot" mark. Whenever fluid is added or removed it's a good idea to shift through the gears then back to park. When checking level ALWAYS check both sides of the dip stick. If one side shows lower than the other, put more faith in the low side. Don't trust an individual reading. Wait until you get 3 consistent readings before you trust it. Holding the dipstick up to a good light helps.
I've learned from experience that while changing transmission fluid it saves time to measure what comes out, then put the same amount back in. I use a funnel and pour my drain pan into a gallon jug, then I use an identical (clean) jug and fill to the same level using new fluid. The transmission is then serviced from this jug. After a couple of quarts I start the engine, shift through the gears, then finish servicing SLOWLY with the engine running. Assuming the transmission fluid level was correct before, it will be correct again (no fussing around with incremental adding/subtracting of fluid). Tim