How does it work and is it easy to install and will it increase/decrease speed or acceleration.

It locks the diff. Makes both rear wheels spin at the same time. This gets you better traction and helps it accelerate faster. It also helps you pull wheelies easier and makes it so not only one wheel spins. I love this upgrade its definately one of my favorits so far. It was not TOO hard to put together and install, but you do have to follow the directions carefully. Its got alot of small parts so if you get it make sure you put it together on a plate or in a pan or something like that, just to make sure you dont lose any pieces.

this sounds awesome...what cars can it go on...i have a jato 2.5...would it work on this? one last question...where do you get it?

well i am getting mine of towerhobbies also in reply to hot-shot(does it go in the gear box or what??

yup, the differential (proball), goes in the gearbox. you will see what to take out of the tranny once you crack it open. Its the biggest gear in there, and the proball will look the same as the one you take out (except the proball diff is black and the stock diff is white) ... you will love it though!!!

Sorry buddy, I dont see one listed on the traxxas site for a jato, only the rustler... I dont know though it might still fit... you would have to compare the diff's part #'s and see if they are interchangeable... sorry I would check that for you but im too lazy

oh so the gear with all the little gears in it???

Yeah that looks like the one... in this diagram it's part #2382... the proball diff which replaces that assembley is part #4420

http://www.traxxas.com/products/nitr...ans%20assy.pdf

yeh man i wish i woulda had this when i first got my car cuz i stripped all those littler gears the day broke it in but thanks alot

no problem glad to help!