so my x has over 200,000 on it now. ive had it for about 4 years now and it had 174,xxx on it when i got it. i have no service records for it. it shifts into 2nd a bit slow sometimes, by that i mean it will take an extra second or so to fully engage 2nd so the rpms will go up for a bit bc its slipping then it will fully engage 2nd and be fine. that rarely happens. but i dont want it to happen at the wrong moment when i need to get up and go so i want to try to fix it. so, do i first try to flush the crap out of the trans? i have 4x4 so i was also wondering if the transfer case used the same fluid or is it seperate? i would like the flush that too. i dont intend to get rid of this truck for a good while so a trans rebuild is on the table. i would probably replace the torque converter along with it. i have never dropped a trans or rebuilt one so i was wondering 2 things: how hard is it? how much would it cost me in parts? 3rd option....screw it leave it alone till it stops working opinions? ps.... i tried some of that trans fix stuff you put in the trans fluid to help it shift smoother and rejuvinate the fluid....that didnt do anything at all. thats been in it for atleast a year.