47RE No Overdrive
 

Hi everyone, I am new here and have lurking for the last couple days and have not found my issue anywhere else. I live in Santa Fe, Texas which is about 30 miles south east of Houston. If anyone can help or direct me to a trans shop that would be willing to look at this it would be greatly appriciated.

I have a 2000 3500 Ram Van. I rebuilt the transmission, 47RE, about a year ago. This is the first overdrive trans I have ever rebuilt, but I have no overdrive. I used red eagle clutches and steels, reman converter I got from a local shop, and a Fairbanks TransAction shift kit.

When the overdrive is engaged and I let off the gas pedal it seems as though the van just free wheels. Then, while "free wheeling" if I press the overdrive button it shifts down into 3rd gear. If I am depressing the gas pedal and press the over drive then I can feel the converter unlock but there is no down shift, because I am already in third gear, so there is no free wheeling.

I have repalced the overdrive solonoid, primary shift solonoid, and the speed sensor as well but this has not made any differance. I have adjusted the TV cable multiple times and that just makes the 1-2 and 2-3 shift points change. I believe this is not a electronics issue because they were all new when I rebuilt it and I have also replaced those new parts with other new parts and the issue has not changed.

Last month I took the tail shaft off, in a effort to see what was wrong, and found that both o-rings on the overdrive piston were blown out so I replaced them. The only thing it does different now is I get a trouble code, telling me it is not shifting into overdrive, or RPM higher than expected, something like that. I don't remember the code number and the van is out of town right now but I can pull the code when it is back this weekend.

Any ideas or suggestions? I am planing a trip from here in Santa Fe, Texas to Salt Lake City in Sept. and would really like overdrive so I get better than the 10 mpg I am getting now.

Any help or suggestions would be very much appriciated.

Did this just happen ? Or has it been that way since the rebuild ? Does the OD light work ?

Lots of those the switch or the servo go out.....

90% chance its the micro screen inside the servo , is cloged remove the screen if pluged the parts guy at the local dealer clued me in on that trick
also the od accumalator piston is nylon and it breaks you will have to get into the valve body to replace that part www.pact.com lots of good replacement parts here manuzls and tools the repairs can be done in your garage