Torque Convertor Lock-up?

MAC712

MEMBER
2002 DODGE RAM
6 CYL
4WD
AUTOMATIC
64,000 MILES

I have installed a BD valve body have a hypertech tuner. I have approximately 6000 miles on the new valve body with no problems. Lately, at 35 and 45 mph when the torque convertor is supposed to lock, it hunts instead. It locks over 40mph and again over 50 mph. Other than this there is no problem. I'm told that there could be a grounding problem among other things. My driver's side battery has issues with the negative terminal and corrosion. I've noticed that there are 2 additional wires connected to this pole and they may have some deep seated corrosion in the wire jackets. Are either of these part of a transmission circuit? Cleaning the terminal seemed to help the problem a little but it's still there.

Wednesday, September 16th, 2009 AT 1:30 PM

2 Replies

ANJR

MEMBER
32 POSTS

Check for a Service Bulletin on that - I had the exact same problem with my '98 Dodge/Cummins & it's the voltage going to the unit which controls the lock/unlock function. At the time nobody knew what it was (not even the factory engineers) but they finally came out with a S.B. On it & the voltage has to be exact - if I remember right, if it fluctuates more than 1.2 Volts, the lock/unlock function won't work right.

Also, buy yourself a battery teminal cleaning brush & a pack of those red/green felt gaskets to put on the battery teminals before you install the cables - yes, they really do work. You will still get some white, dusty corrosion on the negative terminals over time, but it takes a LOT longer to develop & it you brush it off when it starts to form, you'll be fine. Oh - don't let the dust get on your clothes, or there will be holes in them after the next wash (don't ask me how I know).

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Friday, September 18th, 2009 AT 2:16 PM

MAC712

MEMBER
2 POSTS

I removed my battery cables and cleaned the terminals as recommended in preparation for taking the truck into the dealer... Low and behold I drove the truck the next day and the problem was solved! I could have easily spent several hundred dollars for nothing. If you experience this problem start by cleaning you electrical contacts first.

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Monday, September 21st, 2009 AT 12:56 PM