47RE lockup
From : nosey
Q: does anyone know what controls the shifts and torque converter lockup when turning od back on my transmission does not slip or shift erratically at all when i leave the od button turned on. if i turn od off and accelerate from a stop the transmission up-shifts nicely. when i turn od back on at speeds at or above where it would normally shift into 4th gear the transmission either goes neutral or slips badly for a few seconds then engages again in what seems like a lower gear then up-shifts again and acts normally until i lock out od again. it only happens on immediate up-shifts when turning od back on. its been doing this for several years now so i dont think its a sign of impending doom. i dont lock out od very often but when i do i know to coast for a few seconds when turning it back on. im going to pull the pan to adjust the bands soon and want to know if there is something to check or adjust while the pan is off. i can wire up a manual lockup switch or lockup signal indicator light before taking it apart if it will help troubleshooting. -- ken .
Replies:
From : max dodge
sounds like either the solenoids are confused and not working correctly when the mode changes or the pcm gets confused. could this be a result of interference in the shift control circuit caused by the alternator wire the cure for this was wrapping the wire in aluminum foil or something odd like that. -- max everyone is entitled to his own opinion he is not entitled to his own facts. sen. daniel patrick moynihan of new york does anyone know what controls the shifts and torque converter lockup when turning od back on my transmission does not slip or shift erratically at all when i leave the od button turned on. if i turn od off and accelerate from a stop the transmission up-shifts nicely. when i turn od back on at speeds at or above where it would normally shift into 4th gear the transmission either goes neutral or slips badly for a few seconds then engages again in what seems like a lower gear then up-shifts again and acts normally until i lock out od again. it only happens on immediate up-shifts when turning od back on. its been doing this for several years now so i dont think its a sign of impending doom. i dont lock out od very often but when i do i know to coast for a few seconds when turning it back on. im going to pull the pan to adjust the bands soon and want to know if there is something to check or adjust while the pan is off. i can wire up a manual lockup switch or lockup signal indicator light before taking it apart if it will help troubleshooting. -- ken .
From : Annonymous
this is just my personal experience; i have a tc lockup switch when i turn on the od with the switch off 50 to 55mph i experience the same as you are describing. with the switch on it shifts very fast and firm. if you go with a lockup switch please not the following the tc will not lock in 1st gear. the trans will not downshift while the switch is on. in a breaking maneuver this helps slow down. the flip to that is the truck will not stop in safe manner. at 25 mph the engine is at idel in 4th gear slower than that if this is a cummins the truck will fight the breaks. -- billy 1995 ram 2500 4x4 cummins 07 800efi polaris sportsman http//www.rubberdowncustoms.ca/ .
From : nosey
max dodge wrote sounds like either the solenoids are confused and not working correctly when the mode changes or the pcm gets confused. could this be a result of interference in the shift control circuit caused by the alternator wire the cure for this was wrapping the wire in aluminum foil or something odd like that. i thought shielding the alternator ground wire was to prevent the torque converter from cycling in and out of lockup at cruise speeds. im not sure it will help but its easy enough to find out. the only time i have problems is when initially turning od back on at speeds above the normal 3-4 shift. if i turn od back on at speeds below the normal 3-4 shift its fine. if i leave od turned on it works perfectly. if its interference i would expect it to happen during the normal automatic 3-4 shift as well. ill try it and let you know. -- ken .
From : nosey
krenelka@bowie-cass-ssac.com wrote this is just my personal experience; i have a tc lockup switch when i turn on the od with the switch off 50 to 55mph i experience the same as you are describing. with the switch on it shifts very fast and firm. if you go with a lockup switch please not the following the tc will not lock in 1st gear. the trans will not downshift while the switch is on. in a breaking maneuver this helps slow down. the flip to that is the truck will not stop in safe manner. at 25 mph the engine is at idel in 4th gear slower than that if this is a cummins the truck will fight the breaks. thanks billy. it is a cummins. i am aware that it will stay in gear when coming to a complete stop if the torque converter is manually locked. thats the only reason i havent wired a switch yet. ive been rolling the idea around that the pulse signal from the vss could be used somehow to disable manual lockup at low speeds but i havent got that ironed out yet. i believe the vss gives 8000 pulses per mile so 25 mph is about 55 pulses per second. if i can find a control circuit that switches a relay at 55 pulses per second it would be simple to implement that as a low speed override. -- ken .
From : john kunkel
does anyone know what controls the shifts and torque converter lockup when turning od back on my transmission does not slip or shift erratically at all when i leave the od button turned on. if i turn od off and accelerate from a stop the transmission up-shifts nicely. when i turn od back on at speeds at or above where it would normally shift into 4th gear the transmission either goes neutral or slips badly for a few seconds then engages again in what seems like a lower gear then up-shifts again and acts normally until i lock out od again. it only happens on immediate up-shifts when turning od back on. its been doing this for several years now so i dont think its a sign of impending doom. i dont lock out od very often but when i do i know to coast for a few seconds when turning it back on. im going to pull the pan to adjust the bands soon and want to know if there is something to check or adjust while the pan is off. i can wire up a manual lockup switch or lockup signal indicator light before taking it apart if it will help troubleshooting. what year is the truck have you checked for codes there are a couple of tsbs in the late 90s/early 00s dealing with converters dropping out of lockup and delaying lockup due to insufficient fluid flow. your problem might be a case of the converter dropping out of lockup due to the fluid demand caused by the engagement of the od this would explain the perceived neutral condition as the shift event occurs. if the vehicle speed exceeds the throttle setting when the converter unlocks it seems like it goes into neutral then as the od engages and the converter delays re-engaging it would seem like a double-shift. .
From : nosey
max dodge wrote could this be a result of interference in the shift control circuit caused by the alternator wire the cure for this was wrapping the wire in aluminum foil or something odd like that. i wrapped the alternator ground cable in foil and taped it up. that didnt seem to help. thanks anyway. -- ken .
From : nosey
john kunkel wrote what year is the truck have you checked for codes its a 99. i had it scanned today and it showed no codes. there are a couple of tsbs in the late 90s/early 00s dealing with converters dropping out of lockup and delaying lockup due to insufficient fluid flow. your problem might be a case of the converter dropping out of lockup due to the fluid demand caused by the engagement of the od this would explain the perceived neutral condition as the shift event occurs. if the vehicle speed exceeds the throttle setting when the converter unlocks it seems like it goes into neutral then as the od engages and the converter delays re-engaging it would seem like a double-shift. this tsb http//dodgeram.info/tsb/2000/21-02-00.htm that sounds like it may be what is causing the condition. can i replace the separator plate myself ive done shift kits before on c-6 automatics but ive never done anything more than filter changes and band adjustments on any chrysler automatics. will a shift kit help with this problem instead of changing out the separator plate would it be a good idea to change the separator plate and do a shift kit thanks for the help. -- ken .
From : tom lawrence
that sounds like it may be what is causing the condition. can i replace the separator plate myself ive done shift kits before on c-6 automatics but ive never done anything more than filter changes and band adjustments on any chrysler automatics. will a shift kit help with this problem instead of changing out the separator plate would it be a good idea to change the separator plate and do a shift kit a shift kit will necessitate opening up the valve body anyway and would either include a new separator plate or would have instructions to modify the existing plate. either way youd be touching the plate. removal of the valve body and the rest of the work to install the shift kit is very simple and straight-forward. just keep track of which bolt came from which hole and pay attention to the torque specs. when re-installing. if it were me id probably just go ahead and modify the stock separator plate to open up that passage as well as install a shift kit might as well - the vbs apart. and while youre at it install a drain plug in the pan - it will make any future fluid/filter changes a lot less messier .
From : tom lawrence
pull the fluid out through the dipstick tube. it doesnt get every drop but it keeps it from spilling all over the place when dropping the pan. just as good... anything to avoid the otherwise-inevitable atf shower .
From : john kunkel
thanks tom. ill look into the shift kits. be aware that the term shift kit is somewhat generic there are cheap shift kits that can actually cause more harm than they help. look for a reprogramming kit like the transgo tfod-hd2. .
From : nosey
tom lawrence wrote that sounds like it may be what is causing the condition. can i replace the separator plate myself ive done shift kits before on c-6 automatics but ive never done anything more than filter changes and band adjustments on any chrysler automatics. will a shift kit help with this problem instead of changing out the separator plate would it be a good idea to change the separator plate and do a shift kit a shift kit will necessitate opening up the valve body anyway and would either include a new separator plate or would have instructions to modify the existing plate. either way youd be touching the plate. removal of the valve body and the rest of the work to install the shift kit is very simple and straight-forward. just keep track of which bolt came from which hole and pay attention to the torque specs. when re-installing. if it were me id probably just go ahead and modify the stock separator plate to open up that passage as well as install a shift kit might as well - the vbs apart. and while youre at it install a drain plug in the pan - it will make any future fluid/filter changes a lot less messier thanks tom. ill look into the shift kits. i havent had much luck with add-on drain plugs. they always seem to leak for me. i use a vacuum tank to pull the fluid out through the dipstick tube. it doesnt get every drop but it keeps it from spilling all over the place when dropping the pan. -- ken .
From : nosey
john kunkel wrote be aware that the term shift kit is somewhat generic there are cheap shift kits that can actually cause more harm than they help. look for a reprogramming kit like the transgo tfod-hd2. thanks john. what do you think of the transgo tfod-diesel -- ken .
From : john kunkel
john kunkel wrote be aware that the term shift kit is somewhat generic there are cheap shift kits that can actually cause more harm than they help. look for a reprogramming kit like the transgo tfod-hd2. thanks john. what do you think of the transgo tfod-diesel same thing only specifically for diesels. i recommend it. best prices ive found are at bulkpart.com .
From : nosey
john kunkel wrote john kunkel wrote be aware that the term shift kit is somewhat generic there are cheap shift kits that can actually cause more harm than they help. look for a reprogramming kit like the transgo tfod-hd2. thanks john. what do you think of the transgo tfod-diesel same thing only specifically for diesels. i recommend it. best prices ive found are at bulkpart.com thanks again. -- ken .