I have a 2005 dodge 3500 stock 48re auto transmission, If the speed sensor on the bottom of the tranny is plugged in It will not shift into 4th gear, and sometimes in 3rd gear it will randomly shift it self into a neutral position and just rev up. Now for the wierd part is if the speed sensor is unplugged it will shift into all gears fine if you let off the gas and let it shift almost like a manual. BUT if the gas light comes on it goes into limp mode so you cant go over 20 mph. I have taken it to the local dodge dealership and put over 20 hours of diagnostic time in. They replaced the speed sensor so I know thats not it.
My question was is I am at 190,000 miles and I was thinking in upgrading the tranny, I was wanting to go with a 6 speed but their is so much to doing that so now I am thinking of putting the 6 speed auto tranny in with the manual on the fly. If anyone has any information on doing something like that I would love to hear about it. or have any other good options let me know.
Any input would be awesome I am on my last leg with this truck
Last edited by brockrickerson2009; 02-08-2011 at 12:57 PM.