Unless you have the big bellhousing for the c-4 you cant use aod flexplate. Take the 154 flex plate and the aod flexplate to a balance shop. Get the c-4 flexplate balanced to the aod fexplate specs. Just went through this a couple of wks ago. 40-60 bucks should set you free. Make sure you dont have a c-5 bellhousing (big) as it is deeper than c-4 and convertor will not work. dunno if this is your prob. but some things to keep in mind
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89 Notch: 10 pt. cage, d&d rear coil overs, moser 33 plines and spool, gutted 
91 Hatch: cobra int. fms. c-springs, novi-1000 w/f-150 crank pulley (9lbs.) 
06 F-350 6.0 crew cab lariat srw 4x4: turbo back exhaust, sct xcal. 
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