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John Deere Tractors Discussion Forum
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18.4-38 on 4020???

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Luke

11-05-2003 16:09:45




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I have number 264 in 4020s. When I bought it, it already had 15.5-38 on the back and narrower front tires. I have put wider front rims with 10.00-16 on the front and would like to put 18.4-38 on the back. I know 4020s came out with 34s, but will 18.4-38 mount up on it if the fenders are raised all the way. OR, would I have to cobble up my fenders to make them fit (which I will not do!) Any advice is greatly appreciated. Also, does anyone know Dan's Tractor Parts contact information in Colorado? I lost his info and really need to talk to him. Thanks! Luke

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Crum

11-05-2003 23:29:53




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 Re: 18.4-38 on 4020??? in reply to Luke, 11-05-2003 16:09:45  
Our 61 4010 (rebuilt to 4020) always had 18.4-38 rubber for as long as I could remember. The tractor dynoed at 104 hp. and we didn't have problems overpowering the tires. This had 600 pound concrete and barn cleaner chain wheel weights and was the prime mover for all the heavy work. We pulled a 4-16 fully mounted plow in the worst conditions for years, The biggest problem was keeping the front end down.

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ron

11-05-2003 21:25:11




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 Re: 18.4-38 on 4020??? in reply to Luke, 11-05-2003 16:09:45  
I have a 4010 and it has 18.4-38's on it. No problems at all.



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Mike

11-05-2003 16:56:06




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 Re: 18.4-38 on 4020??? in reply to Luke, 11-05-2003 16:09:45  
I have a 71 powershift 4020 with 20.8x38's with no problems.



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Mike Aylward

11-05-2003 16:23:23




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 Re: 18.4-38 on 4020??? in reply to Luke, 11-05-2003 16:09:45  
Luke, I have a '64 4020 as well and have 18.4-38 Firestone Deep Tread tires on it which are some of the biggest tires for their size that were made. I have the fenders in the top setting and there is about 1 1/2-2" of clearance. The tires are not new but will have a very similar radius to new currently available tires. If you want to install the 18.4 tires you will have to use a wider rim. Odds are, if you have 15.5's on now you have either a 14" or 15" rim. You will want at least a 16" on an 18.4 section tire. I have 11:00-16 tires on the front of mine and use a loader on this tractor all the time. You won't have any trouble with a tire this big on a 4020 as several of the latest ones were available with this size tire. However, you might want to add a step because it gets pretty far off the ground the older you get..:-) A nice middle of the road approach would be to use 16.9-38 tires. They can be used on your existing rims and will gain you quite a bit of height- probably at least 2" of axle height. The 18.4's will be at least another inch or better of axle height (loaded radius) over the 16.9's. Hope this helps. Mike

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Gpower

11-05-2003 16:15:59




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 Re: 18.4-38 on 4020??? in reply to Luke, 11-05-2003 16:09:45  
We have a 4010 with 16.9 38 on it, and looked at putting the 18.4 38 on. They will fit without cobbling the femders, and yes you may have to raise the fenders, ours still have 3 holes left to go higher. THey will look good on it! Good luck

Gpower



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