trans ?????

[Devils422]

:drive:I finally was able to take my cart in the dirt for the first time. I noticed it doesn't have a posi. Is there a way I can make it posi or do I have to change the trans on it? I have a Sunl 250cc with a cn250 motor.

[zman007007]

seems mighty strange to me that a cart would not have posi traction.

[2SlickNick]

.Very weird indeed. put it on a jack and hit the gas. Maybe some bearings in somewhere are worn.

[zman007007]

I am not sure what kind of rear end is run on these carts. Does it have a straight axle or does it have a small like drive shaft that goes to each rear wheel?

[zman007007]

A answer to that will help us a lot.

[Masteryota]

I am thinking the Sunl has a gear box/diff like most of the 250 with IRS. If so, the diff may be an open diff. I have seen a few threads on BN where some guys mentioned a limited slip option, but I'm sure if they are available for your buggy. It would be wise to consult with one of the vendors here or over there to see if those parts cross over to yours.

[Devils422]

it seems it does have a limited slip because it will spin the other wheel when the drive wheel is hung up. I am having a hard time figuring out why it wouldn't have posi. There are drive shafts that come out independently from each side of the gear box but only the rear passenger side has drive power while the other just spins freely. (jacked up the cart and hit the gas to determine this).

[Masteryota]

If you had both rear wheels locked, that would put a lot of undue stress on the CV's. That is why they are generally left as an open diff. The fact that the free wheel spun while the other was stopped, further reinforces the idea that it is indeed, an open differential. From the factory, spools and open diffs are simple, and cheap to mass produce, but spools break things, just ask anyone who had run one. The LSD is complicated, and expensive, and somewhat failure prone when mass produced in a low/no QC environment. I will link an old tube vid on diffs that I watched when starting out in my field, and while it is ancient, it effectively explains differential need and operation.

http://www.youtube.com/watch?v=yYAw79386WI

Here is a Toyota instructional on types of diffs as well.

http://www.youtube.com/watch?v=gIGvhvOhLHU

[2SlickNick]

What a great video. I now completely understand differentials. Also old informative videos kick azz.