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Order Ford 600 Parts Online

600 vs 800 rear axle ratio

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markct

11-29-2016 03:15:43




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I have been wondering if the 800 tractors had lower gears to make up for the larger tires. I have an 800 rear end on a 600 tractor and it's seems slightly slower so it got me wondering




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JMOR

12-01-2016 06:54:34




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
word of caution: don't get too hung up on ground speed. I have two virtually identical 8Ns and one always travels faster than two. Identical tires, even brand/age, identical transmission and differential gears.......reason is that governors do not govern tho same speeds. On later tractors, all optional transmissions do not have identical gearing, either.



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CTPhil

12-01-2016 06:30:13




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
This may or may not be helpful but an observation. I have both a 2600 and 4100, both 1978. Despite having smaller tires, the 2600 is way faster.



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JMOR

11-30-2016 08:25:23




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
40 teeth/6=6.6666 and 43 teeth/6= 7.16666



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Machnegative

11-30-2016 05:35:03




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
Got to looking at the same page in the 600/800 manual as above in the 2000/4000 manual and found the same info on rear end ratios. Just a little lower ratio in the 800 series. third party image



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keith williams

11-30-2016 07:44:49




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 Re: 600 vs 800 rear axle ratio in reply to Machnegative, 11-30-2016 05:35:03  
I think that is just a rounding thing. I would guess the gears are the same. 800 /801 /4000
To the other poster, different ratios means different gearing.
IMHO
Keith



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Montana55

11-30-2016 05:06:01




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
Looking at Machnegative's "ground and engine speeds", I would think the point of comparison is direct drive forward, in other words, what is the ground speed in high gear.

Model 640 is 13.67 MPH, model 650/660 are 14.73 and model 850/860 are 14.10.

I don't know what the original tire sizes were, but to me it appears that the 650/660 had the same ring and pinion as the 640, just larger tires. Then the 850/860 either had shorter tires or lower gearing.

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keith williams

11-29-2016 07:45:10




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
third party image

third party image

From 2000 & 4000 Manual.



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Machnegative

11-29-2016 05:36:49




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 Re: 600 vs 800 rear axle ratio in reply to markct, 11-29-2016 03:15:43  
Havent actually counted teeth, but here is a chart from a manual that seems to support your hypothesis of different ratios.
Jeff
third party image



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markct

11-29-2016 05:47:28




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 Re: 600 vs 800 rear axle ratio in reply to Machnegative, 11-29-2016 05:36:49  
Interesting, so it would seem that even with the larger tires the overall speeds are slower on those tractors, thus a lower rear end for sure. I have the smaller 600 size tires on it so it's definitely slowed down a fair bit.



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