No the trans does not slip when its at 5k, it has this problem in neutral when the trans is not in use, It physically will not tach past that, I just thopht I would tell about my other problems also to see if someone new about them also, my trans is just wierd, I might go get in it now I drive allday long and no slipping or any other problems with trans, but I might go get in it and it might start slipping or it will just not crank and the d4 light will start flashing, but I really just want to fix the engine part not taching past 5000rpm, and also when it reaches 4000rpm it takes it a long time to reach 5000rpm, but it runs to 4000rpm great, but after that it feels like i am pulling a 5000lb camper up a mountain