Actually I'd say that you can rule out the cable being your problem. The shift cable in the 200R4 has to be fully extended against its stop at full throttle. Anything short of this and partial line pressure can allow the trans to slip. So you can't have too tight of cable at full throttle, and if the cable was adjusted too short it would simply keep the carb from fully opening - but not extend shift points. Basically 100% is 100%.
I'd be looking into something being wrong with the valve body or governor. I hate the location of the 200-4R governor compared to the T400 that's accessible by removing a side cover. The 200-4R is only accessible by dropping the pan, and that makes it a pain to fine tune or even inspect.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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