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Hey everyone,

After I broke my rear axle this spring my 850 has just been sitting, waiting for something. I was thinking about selling as is, but I've put so much time and money into it, I wouldn't get what I want out of it.

I've been patiently waiting for an 850 to pop up on craigslist, and swap that rear end into mine. Does anyone know if, say, and 800 or 900 would work as well. I have no idea about this....

Thanks in advance,

Jeff
 

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Senior Member
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Jeff
Welcome to GTTalk.
One of our in house Bolens experts should be along shortly.
 

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Tractorholic
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I believe just the 800 and the 850 are compatible according to the part number 1720256, but I'm not 100% on that.
 

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Fixer of Broken junk
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If it was mine I would try to find a 1050 and swap out the transaxle and driveshaft.The dual belt setup on the 1050s make for one heck of a good working machine.
It would be a shame to tear a nice round hood 800 or 900 Bolens apart for the transaxle.

There's a 1050 on ebay cheap.bolens 1050 lawn mower garden tractor | eBay

If your not worried about putting another Posi-lock tranny in it then any tube frame tranny will work including one out of a G10.
 

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EricFromPa said:
If it was mine I would try to find a 1050 and swap out the transaxle and driveshaft.The dual belt setup on the 1050s make for one heck of a good working machine.
It would be a shame to tear a nice round hood 800 or 900 Bolens apart for the transaxle.

There's a 1050 on ebay cheap.bolens 1050 lawn mower garden tractor | eBay

If your not worried about putting another Posi-lock tranny in it then any tube frame tranny will work including one out of a G10.
like he said i would find a junk 1050 an swap it since it has the gear hi/lo. it wouldnt be hard at all to do. i am puttlg s 1053 rear in my 850 since i already have a parts 1053 sitting out back
 

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DR. Bolens
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As mentioned above you can swap out the transmission and driveshaft from a 1050 or similar , or if you want to stay original with the 3 speed tranny you will need to get one out of a 600,650,750, 853(no Locking differential on those models) or 800,850,900 ( with locking differential)
 

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Tractorholic
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not sure how yours is put recently I swapped in a 1050 trans into my G11 that had a 3 speed in it. Only thing I had to swap in other than the trans was the back side adapter on the driveshaft that slides onto the transmission shaft. If I remember correctly the 3 speed that was in mine was a splined shaft where as the 1050 one I put in had a keyed shaft. It was a very easy swap and since the G11 Has the 2 different belt locations that give you the high and low speeds when you add the high low trans on top of that, you have yourself a 12 speed tractor!!
 

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where are you located i have a 850 parts tractor in my back yard just waiting to help someone like yourself. im in CT.
 

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Tractorholic
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dmcjt850 said:
where are you located i have a 850 parts tractor in my back yard just waiting to help someone like yourself. im in CT.
Thanks but its to far for me im in southeast PA, i could get one without a problem but at the time I had a 6 speed sitting in the shed taking up room so thats why the 6 is in, plus it was already paid for
 

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Bolens 1000 said:
As mentioned above you can swap out the transmission and driveshaft from a 1050 or similar , or if you want to stay original with the 3 speed tranny you will need to get one out of a 600,650,750, 853(no Locking differential on those models) or 800,850,900 ( with locking differential)
If you use a 1050 transaxle, you do not want to swap driveshafts. You need to use the 850 driveshaft. The 1050 driveshaft is 1/2" longer. What you DO need is the splined coupler that connects the driveshaft to the transaxle on the 1050, to replace the keyed coupler used on the 850 transaxle.

When I bought my 850, it had a 1050 driveshaft in it (and 850 transaxle). The transaxle was slid back about 3/8" to make it fit, which meant both brake drums also slid back 3/8", and the frame mounted brake pads no longer lined up... And if your brake pads don't line up, you don't have a driveshaft brake, so you grind gears every time you shift into gear. Which is why the teeth were completely worn off 2/3 of the thickness of one of the gears.

So, to clean up the mess, I purchased the correct length 850 driveshaft from a friendly highway robber on ebay, swapped in a spare gear from a parts transmission that came with the tractor, and put all new seals in it. Well, that didn't work out so well, I had a leak from the left side, either the axle seal or the hub seal. And every time I pulled the left hub off to mess with it, the axle seal would get torn up from the threaded axle. I did this 3-4 times, spending $10 on a new axle seal every time before cutting my losses and swapping in a 1050 transaxle. And yes, I tried putting tape on the threads to protect the seal. It worked a few times, but other times it did not...

I'm much happier with the 1050 transaxle compared to the 850. The obvious difference is the hi/lo range. There are two other improvements:
1) The threaded end of the axle is a smaller diameter than the rest of the axle, so when you pull the hub off, it doesn't tear up axle seals.
2) The 850 transaxle housing wears down where the left hub rubs on it. The 1050 uses thrust bearings here.

Also, if you do swap a 1050 transaxle into the 850, and you want to use the hi-lo range on the 1050 transaxle, you'll need the selector lever. You do not need a transmission cover; you can drill the 850 cover to accommodate the selector lever.

As far as having 12 speeds to work with: I haven't really looked at this systematically, but with both in high range, the speed in high gear seems quite a bit faster than stock. With both in low range, in low gear, the speed seems quite a bit slower than stock. So you do gain more options on both ends. I haven't bothered figuring out how to shift through the gears sequentially. I normally run the tractor with the belt selector in low range, so the driveshaft will spin slower, and the transmission in high range.
 

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you definitely want the locking differential with high and low, if you are going to be plowing/snowblowing
 
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