Iowa Chapter Director
Join Date: Jul 2002
Location: Ames, Iowa
doesnt sound like a torque converter problem, sounds more like maybe dirty or low fluid. Have you checked the fluid level since it started doing this? Try that first, if not.
But if you do decide to swap TC's, I think the 84's had a c-6 tranny, not absolutely sure though, and I dont think it would work. Not real knowledgable on the older fords though. But dirtyd0g makes excellent high stall torque converters at an unbeatable price. A few members here have his products. I'd personally contact him for any tranny need.
And your flexplate should be fine.
1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner