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Re: 4R70W 3-4 4-3 shift concern
Posted to Transmission Forum on 12/1/2017

Thanks Dan. The torque converter is new from WIT but I have not discounted it as being faulty. I will check the fuel trims and MAF PIDS as well, see if anything is out of range. I did notice the OSS rpm PID is reading 100 to 200 rpm less than engine rpm in 3rd... Login to read more.