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Recently and in the past, there has been the question on which box is power, manual, or GT. I had some independent references that claimed one thing while Mustangs Unlimited and other vendor catalogs indicated just the opposite. Assuming Ford knew what is correct, I looked in the 1966 Ford shop manual and found the following on page 31:
HCC-AT Manual, 19:1, 4 5/8 Steering wheel turns, 4-5 in-lbs worm bearing preload, 9-10 in-lbs total preload
HCC-AX Special Manual, 16:1 3 3/4 Steering wheel turns, 4-5 in-lbs worm bearing preload, 9-10 in-lbs total preload
HCC-AW Power, 16:1, 3 3/4 Steering wheel turns, 3-4 in-lbs worm bearing preload, 8-9 in-lbs total preload
After reading these specs, I wonder if Ford set the 16:1 boxes up differently (bearing preloads) and then tagged them as either AX or AW? If so, then if we put an AW box in a manual setup, should we adjust the preloads to the AX box specs?????

66 Fastback
85 GT Hatchback
67 Coupe
82 GT Hatchback
 

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I wouldn't and haven't. 1 inch pound difference IMHO is not enough to waste the time

Jeff Speegle
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