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Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
Any warning lights on or flashing?
Was the previous fluid dark and did it have an odor?
Does this concern occur under all amounts of throttle application?
Thanks, ***** ***** have access to a good diagnostic tool that can monitor sensors on the engine to see there reading to the PCM?
Have you ever worked on a transmission?
Sounds like your tool can only read codes not see live data from sensors, is that correct?
To have all shifts harsh you either have a incorrect sensor input signal to the PCM telling the PCM your demanding a high load thus the PCM telling the transmission to work under full pressure or you have a concern with the pressure control valves or EPC solenoid at the valve body and pump. Without knowing if the PCM is causing this we may be addressing a trans issue that is in fact not a trans concern. Do you have hydraulic pressure gauges?
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You have a 4R100 transmission. All of the solenoids are in a pack together access by removing the pan and filter. It is bolted in and there is an external connector on the transmission.
I have those steps, see the link below.
I like to stay in contact with my customers. I assume you were not pleased with me or my answer since you did not rate it leaving me feedback. Just so you know we can still work on this issue. We can pick up where we left off or start over. I hate you paid all that money for your question deposit and have left not satisfied. Would any diagrams or repair guides or a phone call help?.