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Tractor Pulling Discussion Forum

John Deere G

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JD Pullin'

06-03-2007 20:18:21




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I have a JD G that I run in a 3 mph class. My 1st gear is too slow and 2nd gear is too fast for my tractor. I have heard you can switch the first gear reduction in a G with that of a JD 70 Diesel to find a happy median. Is their any truth to this or any other options to finding a better speed? Any input will help, not real familiar with these transmitions.




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The Dukester

06-06-2007 06:54:32




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 Re: John Deere G in reply to JD Pullin', 06-03-2007 20:18:21  
My G which is a little "warmed up" but still well within div. 1 rules makes 3 mph with 13.6-38's in low gear but they don't begin to get the traction I need to utilize the engine's power on any track I've tried so far. I tried second just for fun and spun out there too on a pretty good track. I'm switching to 14.9's hoping they'll give me somewhere near enough traction to pull competively at 6500 lbs. in Div. 1. I've seen hot G's pull with 16.9's and 18.4's but of course that's not "legal" in div. 1....and that's all I want to pull in. Might go to 7500 lbs. eventually though.

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Not Sure

06-06-2007 04:51:22




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 Re: John Deere G in reply to JD Pullin', 06-03-2007 20:18:21  
Researched this a while back and didn't think they would swap because gears on 70 are narrower for live pto. If someone knows different for sure let me know because would like to slow first down a little for heavier classes.



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Jak

06-04-2007 14:08:04




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 Re: John Deere G in reply to JD Pullin', 06-03-2007 20:18:21  
Run 16.9 38's and crank her up a little and 4mph can be bumped in 1's gear.I have had all three G's that I pulled this way with no problem.My 1st G ran over 2.5 mph with 13.6's.When I bought the 16.9's it made a world of differance.



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High Octane

06-05-2007 09:18:20




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 Re: John Deere G in reply to Jak, 06-04-2007 14:08:04  
Thats a tall tire! It would do better in a lighter class with those tires, if the motor is close to stock, he may have HP troubles in the heavier classes. Now if its a bigger motor, he may not have a problem with power, and disreguard what I stated. Ive seen G"s bump 3.5 with 14.9s, rpms were at 10% over. Lots of contorversey on why they could go that fast years back, but havent seen the pullers with that G at a pull for a while. But, when they tech inspected em, he was right still in the money. It was a low gear, 3.5 mph class. He had wheel speed and knew how to ride the brakes just right. The G"s in our club today, they run strong, with 15.5s, sometimes 14.9"s and weight them down, and look back and say, lets see that farmall cross this line. But, they are to rule book specs, not factory specs, so dont get confused.

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GPULLER

06-04-2007 08:18:51




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 Re: John Deere G in reply to JD Pullin', 06-03-2007 20:18:21  
I have seen this swap done on a 70 gas. The parts that are needed off a 70 diesel would be the reduction gear, cover, and also the clutch pulley I believe. With this swap you will lower the 1st gear speed, second gear still might be too fast for 3mph. I"m sure the diesel reduction cover would bolt on a G but the clutch brake is a different design and might be a tip off that some thing is up, somebody might start complaining. It would all depend on your rules.
I have checked speeds with the above mentioned 70 gas and my G. The 70 has 16.9-38"s, the G has 14.9"s. With both tractors in low gear the 70 was much slower. The 70 was faster in 2nd, than the G in low, to the point that I would think it would be over 3mph.
I pull my G in a 3 mph class and do not have a problem with speed, but it depends on what size tires you would be running.

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JDBert

06-05-2007 21:00:43




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 Re: John Deere G in reply to GPULLER, 06-04-2007 08:18:51  
HUH- thats interesting- was the 70 stock compared to your "G"???



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GPULLER

06-06-2007 06:15:11




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 Re: John Deere G in reply to JDBert, 06-05-2007 21:00:43  
The 70 was FAR from stock, but still not as strong as a good running G. The guy still has to do some tweaking on the 70. Think it needs some carb work.



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buickanddeere

06-04-2007 20:44:25




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 Re: John Deere G in reply to GPULLER, 06-04-2007 08:18:51  
70D gears in a 70G reduces all gear selections to 87% of their original speed. Now to find a way to cut the 70's & G's reverse gear speed by 1/2.



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easier swap

06-04-2007 12:10:32




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 Re: John Deere G in reply to GPULLER, 06-04-2007 08:18:51  
Seems like it would be easier to put a stroker crank in it and just run 2nd gear.



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