5R55E issues
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Joined: Nov 2018
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From: Newville, PA
5R55E issues
Recently replaced tranny in my 97’ 4.0 with a remanufactured one. Transmission seems to work great except one “small” issue. Whenever I start the engine and put it into drive I only make it about 20 feet and then the tranny just does nothing. It will put itself back into gear within 10 or 20 seconds if I do nothing. I am able to speed up the process by simply smashing the throttle. Other than that the transmission seems to work great. Only does this after sitting for a couple hours and everything is cold. It’s been between 15-30 degrees here lately. Any possible ideas? The old Tranny I took out still had the drum sensor hooked up, could that have permenatly damaged the pci? The truck has 75,000 original miles, just bought recently. The old tranny I took out had similar issue ( you had to smash the throttle to get the tranny to engage but once you started driving it shifted fine as does this one. Any help would be greatly appreciated, sorry for the long post.
thank you
thank you
Last edited by 331GT; Dec 13, 2018 at 04:40 PM. Reason: Info
Did you fill the new torque converter before installing?
Could have some air still in it if not.
If you didn't replace torque converter that is most likely your problem, before and now
All automatics run on ATF fluid pressure, you need 125psi to go Forward and 175psi to Reverse, this is why Reverse is often slow or gone when trans gets older, pressure is lost internally
There is a main pump, front pump, that supplies all the pressure, it pumps fluid at engine RPMs, so if you "smash the throttle" then you increase the pressure, and if were not moving because pressure was low then you would start moving again because pressure went up.
Torque converter is a "Fluid Coupler", this means it needs fluid, lol, I know Duh
It allows engine to rotate at under 1,000 RPM freely, idle, and puts only a little pressure on the transmission input shaft, this allows you to idle In Gear
As engine rpms increase it tries to spin input shaft more, fluid spins faster.
If there is air in the torque converter it will slip and stop putting pressure on the input shaft
Could have some air still in it if not.
If you didn't replace torque converter that is most likely your problem, before and now
All automatics run on ATF fluid pressure, you need 125psi to go Forward and 175psi to Reverse, this is why Reverse is often slow or gone when trans gets older, pressure is lost internally
There is a main pump, front pump, that supplies all the pressure, it pumps fluid at engine RPMs, so if you "smash the throttle" then you increase the pressure, and if were not moving because pressure was low then you would start moving again because pressure went up.
Torque converter is a "Fluid Coupler", this means it needs fluid, lol, I know Duh
It allows engine to rotate at under 1,000 RPM freely, idle, and puts only a little pressure on the transmission input shaft, this allows you to idle In Gear
As engine rpms increase it tries to spin input shaft more, fluid spins faster.
If there is air in the torque converter it will slip and stop putting pressure on the input shaft
Thread Starter
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Member
Joined: Nov 2018
Posts: 4
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From: Newville, PA
Transmission came with new torque converter already installed and transmission was dyno tested. It was a sloppy mess when it arrived. I assumed they shipped it filled with atf. I added 2 quarts and the dipstick showed it was full. Started truck and quickly checked dipstick, it was empty. I could have gotten air in the system by doing that because it was shipped empty. Maybe I’ll have to take it on a 30 minute drive to see if I can get any possible air worked out. I’ve only driven it a couple miles here and there so far.
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