redneck2thamax

i have a 99 automatic transmission, and around overdrive gear, the transmission cant make up its mind whether or not to stay in over drive or shift down, this happens right around 55mph, my speedometer is off because i have bigger tires on the truck, but when i take the battery cables and let it sit for a while it seems to take care of it, but the second im on the highway and i make it down shift it starts acting up again! does anyone know what this could be? and how i can fix it? also is how many times can i reset the computer by taking the battery cables? i don't want to mess it up, and is there an easier way to rest the computer in it?
thanks

67HotRod

Are you doing the apps reset after reconnecting the batteries?

samaf

I had a problem with mine hunting gears and came to find out I had a broken wire in the harness that went to the transmission. A Dodge dealer wanted $2500 minimum to rebuild trans. Trans shop owner found wire fixed it and installed new servos for around $500.

redneck2thamax

what are the apps reset?

jkrauss

try replacing the speed senser on the trans it fix mine also make sure all you battery conections are clean & your batterys are in good condition

redneck2thamax

ok i'll try that bout how much do those speed sensors usually run for? and the battery connections are clean, i just put new batteries in and new connectors.

jkrauss

It was only around $20.00 at auto zone also you also need some die electric grease (non conductive) and you will need a little tran oil . good luck

dollar bill

had the same trouble,scan showed inj pump timing..it turned out i lost part of the program and dealer reloaded it for 80 dollars.tcc relay kept unlocking at around 55 mph and that unlocked the converter..

rebal

it might be as simple as a loose ground.. try the ground wire next to the right fender.

redneck2thamax

Alright sounds good, ima give em all a try an see what fixes it! I just took the battery cables off an it reset everything an its not doing it but I know the second I make it down Shift on the highway it'll start, so hopefully one of these methods fix it, thanks again

and yes it started up again, i had to gun it yesterday and sure enough its happening again.

dieselcamp

It may need the ecm reflashed. Mine did the same I think there is a service letter for this