I haven't done the check valve yet but now don't think I need to. The problem is getting worse. I have checked the cold level before start and it is the same. I have also checked my 300D level before start and it is the same as the 500. I have a trans from an 85 500 that looks like it was just put in before it was parked. I bought it not running so don't know anything about the trans but it is really clean compared to the rest of the car. If I put it in and it doesn't work, then plan C goes into effect. That will probably be to rebuild the trans that is in the car now. Any one know the BOOK TIME to R&R the transmission?

Paul

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84 500 SEL (307,xxx miles)