My husband is having trouble with his trans on his 2005 ram 1500 5.7 Hemi engine. At first it was slipping when it was first started up and now it just wont go forward and sometimes it wont go at all. Reset the computer by disconnecting the battery and it worked okay for a day and than it stopped again. The fluid is fine, not burnt. One of the codes PO876, it came up with several, says its a tran fluid pressure switch. When I looked it up on the internet it referred me to the bad filters that were a problem in this tranny, so we replaced them. It worked for a day and than started not working again. So he wants to try to replace the fluid switch. I know you cant just replace the switch, you have to replace the whole selenoid, my problem is when I called the dealer he said the part is $326. Someone on this forum said they only cost about $90. Am I asking for the wrong part or are the dealers getting that much more for them? Does anyone know where I can order this part on the intertnet? I tried Rock Auto and came up with several different ones. How do I know which is the right one. I was also afraid that the guy who replaced the filters didnt do it right and maybe we should take the pan down and make sure they are installed right. My husband is 70 yrs old and was very sick this year and this is upsetting him. We cant afford to take it to a repair shop but we have someone else who can try to fix it for us if we can just get the right part. Any help would be greatly appreciated.