I'm a new owner of a '99 6 cyl FWD Auto transmission 130k. Last weekend, I bypassed the stock tranny cooler and went with a B&M 70268 to avoid the possibility of milkshake. I picked up 2qts Castrol Transmax Dexron VI to top-off after the switch . My garage has slight incline, nose down, and I lost a little more than 3 qts, added the 2qts I bought, and drove it 9 miles to get more atf. Only then did I notice the the Dexron VI quarts said for GM, though the bottle says "Synthetic blend formula exceeds dextrin III H Requirements". Doh! I replaced the last quart with Mobil 1 Dex synthetic. Fluid didn't look very fresh, and I'm thinking I should drop the pan, clean plug/magnet, and do a flush. I'm praying nothing in that Castrol will damage my tranny. And have a couple of questions:
1) Am I at risk to damage to the tranny with those 2 quarts of the Castrol?
2) For the folks that are swearing by amsoil, which atf are you using from them for your 3rd gen 6cyl 4wd auto tranny?
3 With respect to the diy flush where you use the runner itself to pump out the old atf while you replace with new atf --
3a) After the drain and pan drop, and you replace the pan, do you add those lost quarts immediately into the fill tube before you begin the 'flush?'
3b) Rather than start the engine, pump a quart, stop the engine, add a quart sequence, is there any reason that I couldn't add a couple temporary hose extensions onto the hoses that normally run to and from the cooler, and run instead the return line from a large clean container of new atf, and the send line to a large empty container for the old/dirty atf, and just run the engine once until the new fluid started coming out the send line? Outside of the setup, it seems like this would be a simpler route to go.
