CTD2001

Just started today, went for a ride to town and with the Overdrive off, the converter will lock up in third gear at about 35 to 40 mph and then unlock real quick, then lock up again real quick, then unlock. This all happens at light accleration, now if i acclerate more firmily it will stay locked up. If i accelerate lightly and hit the lock up switch at 35 mph it will stayed locked up. Never has done this before, i havent done anything to the truck in a while. I did disconnect the batteries a few days ago but that was it. I am thinking about doing a APPS reset procedure to see if that helps. Do you guys have any suggestions. The converter is not slipping, just has a hard time deciding if it wants to stay locked or unlock under light to somewhat moderate accleration. Thanks

BigBlue

Sounds like you need a noise filter. Try wrapping the line going from your alternator to your passenger battery in aluminum foil. Worked like a charm on mine.

CTD2001

Which line is it? Is it obvious? Thanks

crobtex

Re-calibrating the APPS voltage solved the lockup problem for one of our #8 members. You can find the instructions in the "Tech Facts" section.

boertje

There was also a bulletin called "1998-2002 Dodge 4th Gear Hunt Fix" from ATS that does a minor wiring change involving the APPS and the PCM. Worked like a charm for me. Haven't been able to find the link but if you PM me, I can scan it since I still have the hard copy.

BigBlue

Yup. It goes straight from the alternator to the passenger battery and is about an 8 gauge wire that's black with a tan stripe.

AllanP

www.happibox.com That solved the problem for me.

Turbo Deeezle

I am having the same problem as CTD2001 but I dont have a lock up switch. I had my trans rebuilt with a triple lock TC and heavy duty valve body a few years ago.... thats all I have modded to the trans. I do have a Superchips tuner though. If I add the Happi Box, will I have any troubles because of the Superchips?

I SPEED

Hey Mike, mine was doing the same thing a month or two ago...check the wiring over at the PCM where the lockup wire is, I had a poor connection. Repaired that and it's been fine since.

CTD2001

Thanks for the info, i think i fixed the problem, i wrapped the tan and black wire from the altenator in tinfoil and also did a APPS reset, so far all seems to be good, i will check over by the PCM and make sure the connections are good though, thanks

sabo21

guys all this 4th gear in and out of lockup hunting can be resolved by simply cleaning the ground cables on both batterys been fixin them for years simple but saved people thousands of dollors ,according if they came to me first..

Fishcop

What sabo21 said....clean those grounds!! I ran an additional wire from the PCM mounting screw to the negative terminal on the starboard side battery post. Seems to work great & didn't cost nothin'.

freedomrider

This Is The Most Awesome Site Ever. I Had The 47re Tranny Lock/unlock Prob. Mine's A 2001 Ram 24 Valve 4x4 Dually & It Just Started With The Shakes Day Before Yesterday. & Similar Prob With One Of Our Cars Led Me To Believe The Lock Up Sol Was The Culpret.a Talk With The Local Dealer Led Me To Not Go There (wallet Not Big Enough). Found This Site By Accident Red The Comments About This Prob& Thought "ya Right , Too Easy". Sabo21 Posted An Answer" Clean The Neg Batt Post" Well I Tried It & It Works Fine Now. Thanx A Lot Guys One Question I Got To Know. Why Does Cleaning The Neg Post Cure This Prob. Is It An Alt Ground Prob, Or Did I Reset The Ecm When I Disconnected The Batts? Any Way Thanx Again Hope I Can Return The Favor Sometime

sabo21

you are getting electrical noise . the computer has a ground clean up inside and when the pcm cant get all the electrical noise out it trickles out ,ex.apps sensor. kinda like calling it a dirty ground , the battery grounds good and clean gives the engine and all the sensors being provided a ground by the pcm a good smooth non noisy ground

J BODY

......cleaning the batt terminals does NOT guarantee that this "issue" will disappear. Often it will help, and is the cheapest easiest thing to do, but in my experience it is not a "cure" by any means.