In Reply to: Re: new ford 8n owner posted by carl nny on October 03, 2018 at 16:33:06:
John is correct.
I also have the Sherman Combo auxiliary transmission in my 8N. Here's the back of the Sherman ad brochure.
Since the Sherman goes in front of the transmission, changing from straight gears to high or low range most definitely does change the PTO speed. I use this "feature" frequently to get more power to run my cutter in tall grass. If the grass is too thick for standard drive first gear 1500 rpm, revving the engine up is going to increase ground and blade speed by the same amount. That is no help. If I reduce engine speed or slip the clutch, the ground and blade speed drop by the same amount. That does not help either. However, drop the sherman to low range, then rev the engine up. Now the ground and blade speed is about the same as it was in standard range first gear, with the engine turning 1800-1900 rpm making more power.