1. P1740 - TCC or O/D Solenoid Performance
Just to get a few things out of the way:
Bad- My first post here
Good or bad depending on perspective: I'm a Dodge dealer Mechanic
Good- I don't need help in this post, hopefully I'm giving it.
Good- I've already been on 2 other car forums for 2+ years and know how to play nice.
OK, now that we're through with that...
I have an 00 Ram 1500 4x4 5.9L Gas with the above mentioned code. I've searched through the TSB's at work as well as on here and a few other sites catering to us truck owners. There were a few things I found consistant. 1. The 46RE sucks/needs lots of attention, 2. the above code is pretty common, 3. There isn't a clear fix for the condition every single time like the blown intake plenum pan gasket.
Not knowing everything I followed the steps of many before me when trying to fix this code and have failed at most every turn. First I found the fluid nasty and low. I topped it off knowing that would probably not fix the condition (which it didn't). Next I research the TSB about the plate hole change, I asked other techs at work who actually rebuilt trans on a regular basis (I don't) and was told where to begin my little adventure.
First I started with a valve body. I changed my filter, flushed the system and put in the valve body. I was told that 90% of the time the revised valve body plate wouldn't fix the code. The new valve body came with multiple components that were at least in the ball park for addressing this code. That didn't fix it.
Next I found that the kick-down cable (throttle body to transmission) had been improperly removed at some point in it's life. Please note I just bought the truck with 70K on it less than 2 months ago. Rather than pushing it forward to disengage the lock and then pulling it off, they just gorilla armed it right off thus breaking it. So it was not properly adjusted. I replaced it. Fixed one complaint I had with the trans shifting wacky but code still came back.
Finally I ordered a torque convertor and yank the trans out this week. The pan magnet has some very fine metal that more or less simply smears in to a grey/black mush but no chunks or metal or copper or such. Trans guy said it wasn't good stuff but not horrible. Anyways we hook up an air chuck and insert the front pump, hub assembly (?) that's behind the pump and put it all upside down in to the TC. Put light air to it in some of the holes and he shows me the clutches being applied and then the entire assembly being pushed up (it's all supposed to do that if it's good). So the conclusion with that was that I should go ahead and replace the convertor having not seen anything horrible yet.
Fine. But then he says while we have it out let's check out the overdrive unit (rear most section before the transfer case). So we seperate it from the rest of the trans and start to pull off the OD piston (?) and find a problem. There's two seals in it (big and little). Well, the big seals, according to the service manual, is supposed to require some trans lube and a special tool(s) to reinstall it. The one out of my truck simply dropped right in (bad). So he removes the two seals and shows me how they've gotten hard and slightly black (I believe this particular started out a medium to dark blue color).
So now that you're all asleep over there I'll get to the point. If you have tried everything else have the over-drive unit checked for seal wear. The seal did not appear torn/ripped/cracked but is was no longer soft like a new rubber band. Hope that this helped you.