Paul 
2005 Nissan Pathfinder SUV SE Rwd 4dr SUV (4.0L 6cyl 5A)
Crap, it happened to mine also!
 Ok, I just bought this pathfinder and traded my other 2 decent vehicles in on it thinking that since this is a Nissan it would last forever and it was newer than my other 2/well as soon as I bought it it started jerking bad and come to find out it is of course the trans and radiator/and as of right this minute it has been in shop for over a week having trans rebuilt and radiator replaced at the expense of the car dealership luckily.  I love this vehicle but Nissan needs to step up to the plate and fix their junky parts! Once the radiator leaks antifreeze in trans it is messed up.  Good luck and hopefully mine will be like new now