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I have a 1997 E 350 V10 4x4, I think the transmission is the 4R100 because it has the crossover pipe. The transmission was rebuilt 3 years ago and now has 30,000 miles on it since the rebuild. I had the transmission rebuilt at a reputable shop and paid $2,500 to have it done. He was supposed to put in updated parts. We have been left on the side of the road with a flashing light and a rough-shifting transmission several times lately. After waiting for the transmission to cool down, it drove fine. I had a different transmission shop pull the codes and the code was supposed to be for a slipping torque converter. I bought a B&M transmission temperature gauge and have installed it and I've also bought a B&M transmission pan which I'm planning to install as soon as possible. I'm considering buy a Banks transmission commander and putting that on, too. I would like to know if this would be worth the money. Would it help prolong my transmission life? I would like to prolong the life of this transmission as I can't afford $3,000 to replace it. Also, a couple of transmission shops have suggested that I turn the OD off all the time. Is this feasible?
I bought a B&M transmission temperature gauge and have installed it
Good.
Originally Posted by imrjeffrey
I've also bought a B&M transmission pan which I'm planning to install as soon as possible.
They look nice, but don't do anything else for you. It make take a bit longer to overheat, but it still will, and then it will take longer to cool off.
Originally Posted by imrjeffrey
I'm considering buy a Banks transmission commander and putting that on, too.
That will just make things worse. All this does it increase pressure all the time. That can add to the heat load.
Originally Posted by imrjeffrey
Also, a couple of transmission shops have suggested that I turn the OD off all the time. Is this feasible?
All that will do for you is burn more fuel. It won't fix the problem.
Something is wrong with the trans. You said you have to stop and cool it off. If it really is getting hot, that's a problem. It is possible, even likely, that one or both of your trans coolers (these vans came stock with a cooler in the radiator and and aux cooler up front) are plugged or partially plugged. That is VERY common after a trans failure.
You can run a test to see if there is adequate cooler flow. If there is, then we need to look somewhere else for the problem. I'll bet there isn't enough flow, or that there is something wrong inside the trans. None of these band aids are going to help it.
"Harsh shifting" usually means the PCM is operating the tranny in "limp" or "fail-safe" mode to prevent further damage. A common reason for limp mode is excessive tranny temperature. Excessive fluid temperature is often caused by a slipping TC. Slipping TC is often caused by worn frictions in the TC, a bleedoff of TC lockup clamping pressure, or by valve body problems.
What are your temps reading when the tranny goes into limp mode? Does the guage reading correspond to the TFT Sensor PID?
With a scan tool, what is the TC Slip Ratio when at highway speed and with TC lockup?
Your best bet chance of prolonging this tranny's life are to install the largest cooler you can stuff in front of the radiator, change the fluid to a synthetic (better able to withstand higher temps without degradation), and perhaps adding a bottle of LubeGuard for good luck.
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