Does the 345 have a posi differential?
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Only the GX 345 and then only on the '04 and '05 models.
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No, under equal traction both sides will drive. Under load the easiest wheel to spin will spin.
Still not posi (limited slip) There IS a diff-lock pedal though. (which actually locks the rear differential.)
Seems pretty rare for any garden tractors to have an actual "posi" or limited slip differential. Typically they are either a standard open differential or have full locking capability (by pushing a pedal or switch). Maybe people are confusing posi and locking differential to be the same? Concept is similar with a "posi" only able to supply a certain percentage of power to one side (meaning under certain conditions you still get one wheel peel) where as a locking differential both sides are 100% locked together.
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Certain year simplicity's have a k61-65 with a limited slip. I just swapped one into my xt1 cub
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Here is a pic of the diff from that k61-65 it's hard to tell in the pic but those are springs above the spider gears
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I'm not saying you are wrong as far as a garden tractor goes (as I'm the 1st to admit that I am far from being an expert on the inner workings of them), but that is not the case in a truck rear end with a limited slip(posi) transmission. As in a truck limited slip, once a wheel starts to spin, more torque pressure is sent to the opposite (stationary) rear wheel to help propel the vehicle forward.
Gentlemen, thank you for answering my initial question.
The reason I asked is that I live on a hill, when its wet ground or ice on the driveway(even on dry ground at steepest areas), posi traction sure would be of help to limit the spinning.
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I do not know of a garden tractor with positraction. I know of many with a locking differential. At 7 to 8 mph a positraction would seem to be pretty ineffective. But a locking diff would solve low-speed issues that only crop up on rare occasions.
Back at my old house, I had the same problem when I mowed my pond damm. I ended up getting a set of bar tires loaded with RV antifreeze, added wheel weights and weight to the front. No more slipping going up or down.You obviously do not mow a 1 acre steep hill, as it is quite common to spin out.
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Proper ballast will help avoid wheel spin, even on hills.
HDAP tires work well, too. I rarely ever use my difflock on my hills or driveway in the winter. I don’t use chains in the winter, either (I use five suitcase weights instead). The tires make the difference - and that pertains to anything be it a tractor or a car.
I think we are basically saying the same thing in regards to how a "posi" works. By the way, "posi" or "Posi-Traction" is actually a specific brand of a limited slip differential as coined by GM a long time ago. There are several different styles of limited slip differentials that use different methods to transfer power to the wheel with traction. Spring loaded clutches, torque biasing/torsion style, etc...and different levels of "power transfer".
I think the main drawback to having a limited slip differential in a garden tractor (same goes with farm tractors, construction equipment, etc...) is that they turn really sharp and you are doing sharper turns way more often than you typically do in a car. A limited slip can't tell the difference between just turning, where one rear wheel is turning faster than the other, and when one tire is spinning faster than the other because of traction differences. The first issue you would have with a limited slip is the machine pushing in the corners, or sliding the front tires straight when you try to turn.....if you have one with a locking diff try pushing the diff lock pedal and doing a full lock turn and see what happens. Granted, a limited slip wouldn't be as severe but you get the point.
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Simplicity Broadmores have a limited slip I posted a picture below of the differential , I have one installed on my Xt1 cub right now as soon as it begins to loose traction I can feel it kick in sometimes it will even kick sideways. When. I have a friend over I'll get a vid
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JD's have locking diff not a posi diff.
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