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post #1 of 6 Old 09-13-2019, 02:38 AM Thread Starter
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JD G100 questions

I just got a John Deere G100, the transmision is toast, it will move but not much, I dropped the fluid and put syn 5w50 in it no differance. drive belt is good so I don't really know what to do, it has a command 25hp twin that runs great, the deck is good and i can salvage afew other parts I dunno if the rear tires will fit on my 317 & 318 I have checked prices on K66 tuff torque and they are 1k + so not sure it's worth it. maybe on a good day in the spring i could get 800 for it so i'm stumped. Thanks
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post #2 of 6 Old 09-13-2019, 07:16 AM
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Re: JD G100 questions

Tuff Torq makes rebuilt kits and there is a set of videos step by step of someone doing this to a K66. Up until recently the K66 could be bought for $300 at Surplus Center. My G100 was a great mower and puller.

Rear wheels will bolt up. Tires are slightly larger at 24x12x12 vs 23x10.5x12. you should clear the decks of the 318/317 and will look better IMO.


1981 400- Vanguard 23 HP, 54C deck, 56 blade, 50 snow blower
SOLD-2003 G100- 54", Kohler Command 25, Gator G5 blades
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer

Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
1968 M35A2

Last edited by Merc1973; 09-13-2019 at 07:21 AM.
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post #3 of 6 Old 09-13-2019, 07:59 PM
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Re: JD G100 questions

The K62 as used in the LX200 series is in the same family as the K66. It would be interesting to see if a K62 from a blown up LX would bolt in place of the K66 with no mods. You would no longer have the [ massively overrated, imo "heavy duty ground engaging"'] transmission but you would have a functioning lawn tractor. Go to the JD parts site and see if the K62 and K66 use the same upper case half. I kinda remember doing this and finding out they were the same PN.
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post #4 of 6 Old 09-13-2019, 10:58 PM Thread Starter
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Re: JD G100 questions

Update, I found a unit out of a 345 or 355? It must be a K71 alot beefier I am going to install it into the G100 looks like the thing will bolt in. I read a thread where it's been done needing the gas tank and linkage from the other tractor, proble is that i used a cutting wheel to remove the transmission and the one rod is completely toast, i swapped the top fan and pulley from the K66 because the one on the k71 was a double pulley, I'm not afraid of hard work i hope that i can make it fit. also the k71 had hyd lift and power steering so i have two lines that im going to have to plug
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post #5 of 6 Old 09-14-2019, 10:26 PM Thread Starter
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Re: JD G100 questions

Did the swap today 3 hours and it's running.
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post #6 of 6 Old 09-16-2019, 11:54 AM
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Re: JD G100 questions



1981 400- Vanguard 23 HP, 54C deck, 56 blade, 50 snow blower
SOLD-2003 G100- 54", Kohler Command 25, Gator G5 blades
JD 46" snow Blade

Stihl 031AV (WIMA cap, base gasket delete) 20"
Echo CS-590 (MM) 20"
Husqvarna 128LD Trimmer

Giant Vac w/ 6.5HP Predator Engine
Unknown 1980's Japanese backpack Blower with Kawasaki engine
1968 M35A2
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