Just did this repair again tonight to another 98 Pathfinder SE. It had the stuck in first and would not shift to second while cold issue. It took about 10-15 minutes of idle time plus driving slow for about 5-10 minutes before it would shift properly. Even when warm it had a slight flare shifting from second to third. Went to Pick N Pull today, (40% off sale) I got a valve body and all 4 accumulator pistons and springs for $37.00 out of a 2004 front end wrecked Xterra. I know it was running when it was wrecked The pathfinder shifts like a new one, and the 2-3 shift flare is gone! This pathfinder had about 250 K miles on it. I didn't check the Xterra miles. So, a valve body, two gallons of fluid, a filter/gasket kit, and two hours of my time and this pathy is running like a champ.
My question is...What the heck is in these valve bodies to cause this "morning Sickness" problem? I took the old valve body apart and did not see any issues or any O rings even. I re-used the solenoid pack from the pathfinder as it was less than a year old and they were like new clean. That eliminates them. No TCM codes either, and the trans fluid was like new clean. (only a year old with 4K miles on it.)
Just to let you know, A transmission shop ( Insert name here) AGAIN quoted about 3 thousand dollars to rebuild this Transmission..."IF" the valve body was good. That was my hint! ( I told him it shifted normally when warm, no slippage) The man probably knew this cold shift issue with the RE4R01A transmissions and after my transmission was removed/torn apart, he would have soaked me for another $800.00 for a new valve body on top the $3K rebuild charge!!!!