Join Date: Jan 2020
Location: San Bernardino county
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Strange transmission shifting
Second post here and I’m looking for a bit of help. I had my 4r100 rebuilt about 10,000 ago. It was a “stage 2” build which included a modified valve body and a triple disk billet torque converter without getting into the specifics. I also have a hydra tuner with php tunes. The truck has a gtp38r, recent stage 1 injectors and some other smaller mods. The question i have Is after i installed the added these performance parts and updated the tunes the transmission is not shifting correctly. Under heavy acceleration it seems like it is shifting up and down and back up again before setting into gear. Seems to be doing this between 2nd and 3rd. It never did this before the upgrades. It may not even be actually shifting and could be the torque converter locking and unlocking. Has anyone else had this issue and if so what was the solution? I was told that it may be because the php tunes are unlocking the torque converter when upshifting which should not happen with this type of torque converter. I was also told it could be a shift flare but i doubted this as the trans has a pretty fresh rebuild.
Last edited by Ewiden; 01-14-2020 at 09:37 PM.