I drained my th 400 for an oil change. Got a little over 10.5 quarts in the pan. My question is; when the pan is drained does the converter drain also, BM converter.
Usually not nugget. The converter will hold whatever fluid it has in it. Unless the BM converter has a drain plug in it. Some aftermarket converter's do. Joe
I find it odd that you got 10.5 quarts by draining the pan. That usually only produces about 4 quarts as I remember Sent from my iPhone using Tapatalk
I have to go with Mark there. Most of the time the drain in fill for a 400 with a stock pan is around 4 quarts. The rest of the fluid stays up in the converter and cooler and whatnot.
The last one I had built took 12 qrts total. 8 in the converter and 4 in the pan. I installed an aftermarket converter but it didn't have a drain plug.
Reading the above answers, I have a question. Since so much fluid stays in the transmission, when dropping the pan, all you're really able to do is a filter change and replace the lost quarts? Kinda makes just changing the fluid a waste of time?
That is what they take but unless there is something wrong (or changed) the converter usually doesn't drain back that much fluid.
Some HD truck and motor home TH400 pans have extra capacity, but I don't believe that much. Could it have been overfilled to start with? I am Butch/56sedandelivery.
I just drain and fill every couple of months or so. I have no idea if it makes any difference, I just feeeel better.
I drove the car for years before pan removal to fix a leak. Over 10 quarts came out. Now I put in 4 qts car won't move, 5 won't move, six Bearly moves, 7 moves but jerky. What the hell is going on. Car drove perfect before pan removal and filter change.
Torque converter is not full. If it's not a posi rear end, you can jack one rear wheel up and put it in drive. This will fill the torque converter and then check stick and fill if needed.
So the converter has drained down into tranny, that is why 10 quarts came out of it? The converter is a BM torkmaster 2400. Some of the guys on here said that that oil in the converter does not drain back into the tranny. Your advice sounds good. Just running the engine in neutral won't pump oil into converter, right? The tranny must be in drive and the wheels up like driving down the road to pump oil into converter, right? Thanks for your help.
10-4. I wouldn't rev engine,just let it idle. Remember to use the brakes and completely stop rotation before placing in park.
I pull the pan and clean it, and add the 5 quarts after replacing the pan. Then I just pull off the return line from the oil cooler, start the engine, collect the old oil in a large container. and fill the tranny in the standard way at the same rate the oil is filling the container. When the colour changes to bright red, it is replaced. It might waste a little oil, but there is virtually no mixing, and it changes the oil in the pump and the converter.
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