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John Deere Tractors Discussion Forum
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John Deere A top speed question

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ffdfireman18

06-13-2012 20:20:29
65.183.175.157



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I have a 45 JD A ser#558344. It has the six speed transmission in it. In the manual with 11-38 tires, the top speed is 12 3/4 mph. Mine has 12.4-38 tires and when you put it in sixth gear it will go 22-23 mph. About 9-10 mph in 4th. Most all the work is done in 1st or 2nd gear. Is it an option or something to have a high speed rear end in it? If so, any ideas on how the gear it down a bit. Thanks for he help.

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buickanddeere

06-15-2012 08:39:20
184.151.63.166



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 Re: John Deere A top speed question in reply to Tx Jim, 06-13-2012 20:20:29  
Quoting Removed, click Modern View to see22-23 kilometers per hour is approx 14mph. Any chance the gps units were switched?Every now and again the cops pull over somebody doing 90mph in a 90 kph zone when the dash is accidentally switched to imperial.



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buickanddeere

06-15-2012 08:39:19
184.151.63.166



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 Re: John Deere A top speed question in reply to Tim S, 06-13-2012 20:20:29  
Quoting Removed, click Modern View to see22-23 kilometers per hour is approx 14mph. Any chance the gps units were switched?Every now and again the cops pull over somebody doing 90mph in a 90 kph zone when the dash is accidentally switched to imperial.



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d beatty

06-15-2012 06:24:55
24.12.128.253



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
We had a 49 JD A with 14.9- 38's and in road gear it ran at 18 to 20 mph.



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navyreteocs

06-15-2012 05:43:30
70.166.236.54



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
Some of MM red nose Us had a real big gear 38 miles per



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gtx1967jewison

06-15-2012 04:47:28
174.230.193.237



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
Check your engine speed! Its supposed to be 975 rpm at full throttle, lots have been turned up.



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ffdfireman18

06-15-2012 04:11:51
65.183.175.157



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
That is way I would actually like the gear down a bit. I'm not looking to run it on the Bonneville salt flats. I honestly think it would go just about 25 mph pushing it hard. I never ran it full open. Your right it does get to be a handfull at that speed, that's way I think I'll keep it out of 6th gear. I would just like a bit more gearing for pulling. I had to laugh when I went to rake hay with with it, and my uncle said he would run maybe 4th gear or so( he has a B, and has never seen mine run). It was 2nd at 3/4 throttle or 3rd @ 1/4 throttle if the ground was smooth enough. Thanks for the input guys. Enjoy the day.

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ffdfireman18

06-15-2012 04:11:49
65.183.175.157



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
That is way I would actually like the gear down a bit. I'm not looking to run it on the Bonneville salt flats. I honestly think it would go just about 25 mph pushing it hard. I never ran it full open. Your right it does get to be a handfull at that speed, that's way I think I'll keep it out of 6th gear. I would just like a bit more gearing for pulling. I had to laugh when I went to rake hay with with it, and my uncle said he would run maybe 4th gear or so( he has a B, and has never seen mine run). It was 2nd at 3/4 throttle or 3rd @ 1/4 throttle if the ground was smooth enough. Thanks for the input guys. Enjoy the day.

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BushogPapa

06-14-2012 20:11:20
173.88.50.86



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
Well, I can say that anything over 12 MPH on an early Row-Crop tractor is an accident ready to pick a Place to Happen... Grandad had a Farmall "H" that wust have been born half Airplane...Never did even get close to 1/2 throttle in 5th with that one...it would FLY, I think..! My 720 D gets mighty "Touchy" at anything over 12 MPH..even though it will go faster..I am NOT going there...!! We don't want OR Need reading about any accidents with farm Equipment involved.. BE Careful..."THIMK"..

Ron..

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BushogPapa

06-14-2012 20:10:56
173.88.50.86



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
Well, I can say that anything over 12 MPH on an early Row-Crop tractor is an accident ready to pick a Place to Happen... Grandad had a Farmall "H" that wust have been born half Airplane...Never did even get close to 1/2 throttle in 5th with that one...it would FLY, I think..! My 720 D gets mighty "Touchy" at anything over 12 MPH..even though it will go faster..I am NOT going there...!! We don't want OR Need reading about any accidents with farm Equipment involved.. BE Careful..."THIMK"..

Ron..

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pbb

06-14-2012 18:42:45
64.233.152.81



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
I know my buddies 52A will do 13 mph on 36 rears.



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larry duda

06-14-2012 18:23:34
208.94.74.65



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
All the A s I ve seen on tractor drives are lucky to do 12mph going down a hill. Larry



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Pbb

06-14-2012 14:17:43
64.233.152.81



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
I sure wished my unstyled 37 A would run that kind of speed.Mine will do 6 mph on the gps will top out at 8 mph while pushing on the govener .I got 14.9-38 rears on it. I"m looking for a overdrive. I can"t do any tractor rides.



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Meangreen

06-14-2012 08:07:53
98.188.136.151



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
I'm just going by what my hand held GPS told me. I could have probably gone 18 downhill as my govenor never could really keep up with the tractor.



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FactoryFarmer

06-14-2012 07:50:11
184.20.101.206



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
I don't know what A's you guys have been driving around but my 45 went 16-18 without mashing on the governor and my cousin and a couple other people that I go with on tractor rides had A's that went just as fast.



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bigboreG

06-14-2012 12:55:55
69.78.70.136



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 Re: John Deere A top speed question in reply to FactoryFarmer, 06-14-2012 07:50:11  
the late As are slower than the midstyled ones. my 49 is the fastest tractor i own.



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buck eye al

06-14-2012 14:39:53
168.251.194.11



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 Re: John Deere A top speed question in reply to bigboreG, 06-14-2012 12:55:55  
I have one very late long hood and a '44 steel tag & like you said... the mid series are faster than the late. These are my fastest tractors. Have never timed 'em but they out run the B's, late A's, the 70D & the WC with nooooo trouble! Of the fleet here, only the 4020D out runs 'em. I've had 'em on more than one tractor tour. Tough to keep the governor from getting confused & keep them from surging so I use the old WC flat top for tours.

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larryanderson

06-14-2012 07:03:27
75.105.32.52



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
It would sure turn heads on a tractor ride.I have heard of people changing them as they were not made for speed.Usually they run under 15MPH.



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Meangreen

06-14-2012 05:48:05
98.188.136.151



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
I had a 44 with the same size rear tires as yours and I topped out at 16 mph fully open.



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bigboreG

06-13-2012 20:25:27
216.51.248.99



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 Re: John Deere A top speed question in reply to ffdfireman18, 06-13-2012 20:20:29  
Are you sure on the speed? i have never seen an A that will go that fast. Unless someone modified it in some way at one point in time. There was no optional high speed rearends for the A series.



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BushogPapa

06-15-2012 05:50:18
173.88.50.86



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 Re: John Deere A top speed question in reply to bigboreG, 06-13-2012 20:25:27  
A friend's JD "R" will top-out at about 16 or so...

Like driving a big heavy Car..!!



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