tnbubBA

man am I sick of dealing with all sorts of gremins on my 2004 GMC sierra 1500 SLE with 5.3 It all started when I replaced/rebuilt my trans. no problems there.. But I had to have the PCM reprogrammed( blackbear) becasue of the new tranny needed the stock tranmission table put back in. I had a spare pcm that my tune was revised and loaded and I installed it. NOTHING BUT ISSUES SINCE. 1) the fan operation was reversed after the PCM install..meaning the small fan and large fan oeration sequence were reversed 2) the TCC occasionaly does not lock up or get called to lock up( verified on scan tool) . so far its been a nuisance 3) the fugger won't ide for squat and sometiems just dies. especially if you whack the trhottle and let off in traffic lets say.. of you get off an highway ext ramp nad pupp up to stop . it seems it cant find idle spot. Ive checked all the friggen grounds ( even reworked and moved the sensor ground lug to firewall stud and grounds tied directly back to battey and block) replaced the temp sensor and tps checked the ground to the pcm what am I missing ? I mean I had none of these problems unitil I swapped the tranny and PCM! I am at a total loss at this point bad or flaky PCM??? also what is difference in the 12679525 and 12679525 TB? anyway to check the ect fly by wire module?

unless you built one before get a used junker and go to oregon tranmission parts and get a rubild.. the 4 l60E are finkiy as carp on the fluidn circuits and interal valvel body leakes and piston leaks wreak havoc so yo need ot chekc all the clearances.. the 3/4 and tcc pistions wear out the housing. that shy i suggest gettign a junker and goign thru it if you neve been insoted one before.. but losts of guys just slup in new pisotons seals and cluthes and keep trucking if the trannys been serviced and kept clean. read up lots of 4 l60E info on sonnax website. sorry for the shitty tying i type like a fingerless drunken kungfu master