What happens when a convertor with a mechanical diode goes bad? I have a Transmission Specialties 8" that has a mechanical diode in it, and 3 weeks ago, something went sour and I'm starting to think it's the convertor. I thought it was the barrel valve or pump, so I sent them back to Ron's and had them rebuilt, but it didn't fix the issue. When I put it in gear, the rpm drops about 500 rpm (it never used to do that), and when I set the transbrake and try to put it on the 2 step, it goes to 1800 and stops (4800 chip, convertor used to stall 6000.) When it went "bad", it was during elims, so I went ahead and ran it, and it wouldnt make any rpm for about 100 feet or so, then it came out of it and ran 'decent', but not fantastic. It normally goes 1.41-1.42 sixty foot and upper 6.40's @ 107 mph (1/8 mile), but that one pass it went 2.35 sixty foot, and 8.09 @ 98 mph. I have checked everything in the motor, and I cant find anything wrong.