Thanks again. It is not often I learn something totally new when it comes to old tractors. I had no idea Ford ever sold such a thing. Yes, I looked at that manual and printed it for the "live PTO" kit. I also saw a little about it in my I & T manual for the NAA. I never looked at the small section that mentions the live PTO because I assumed it would be about the dual-clutch setup like was used later. I have no idea if Ford had any special requirements for oil when dealers installed this kit. It is not mentioned in any literature I have read. Ford called for Type A ATF in all the NAAs. I think this tractor had 20 weight hydraulic oil in it. All the issues I had now make sense. When I first ran this tractor at the junkyard last year - it was 70 degrees F out and it worked fine. I first noticed the problem after starting at 10-20 degrees F. Thinking this was an all-gear drive like my 641, I assumed there HAD to be something wrong. Perhaps not.
Ford warns that when all is fine - the tractor drive is supposed to slip for a good 10 seconds even in warm weather unless the engine is revved way up. I am sure worse with colder temps and thicker oil.
I am going to stick some Deere Hygard in it or some newer ATF. Now that I know what is going on I can stop worrying. I'd rather keep it all intact since it is a rare option. If it ever totally craps out, it looks pretty easy to totally eliminate the option "live PTO" and convert back to a solid drive. All that seems to be needed is the long splined coupling to convert.
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