Not trying to revive this thread nor am I trying to be a know it all but many things have changed and there is so much information to go through...... so ill just get to it. First, I wanna thank all my homies and homettes for a great site , great people and great information. That being said, I need to disagree with MANY things being said on this post and I have to inject my two cents into the conversation. One thing, moose man, the sonnax pinless accumulator for 1-2 are not designed to work with the transgo springs. They end up breaking and that maybe where you’re getting the harsh 1-2 shift from. Also, you drilled the seperator plate.... to match what speciation? You have to match those holes with you particular transmission and if you never removed the second, how did you come up with thi information? And better too small of holes than too big for sur but I would start with that 1-2 accumulater, witch is easy enough. All you have to do is remove the accumulater housing on your next oil change. Not really sure the orientation that’s supposed to be in there, they were all different but try to put the original configuration back in there and it may solve the harsh shift. I’ll bet a dollar you have a Brocken spring in there. Sparky, you too. Check that housing. And mooseman, put those transgo springs in that servo. That could also be the source of the harsh shift cuz the band is slamming into the drum. I’m intrigued to know what if anything happened to that transmission and what shape it in today. If any at all. Plus sonnax makes springs for the 1-2 piinless accumulator or if you happen to be changing the 4th pisto, you can put that in the 1-2( with a pin of course). Not so much addressing you two, just trying to give anyone else chasing this problem the right information. However lined my knowledge may be. I have the transgo shift correction kit in my 2004 trailblazer with pinless accumulators( stock 1-2 springs of course) a corvette servo conversation available for about $20 everyday online. Way cheaper than the a drop in unit and unless you’re going racing with your trailblazers, there is no need for billet anything in a daily driver.
well, with my knowitall rant over with I do want to thank everyone that contributes to this site. I’ve learn a lot since I started chasing this problem two years ago and after religiously servicing this transmission, I lost my original due to the many issues with this transmission it took out the pump, pump housing and stator and finding this kit was a lifesaving event. I hope to get another 100,00 miles out of the transmission. As for others searching for answers to questions about this issue, don’t go drilling a bunch of holes in the seperator plate and make educated decisions before you do the work. Don’t go crazy with throwing a bunch of parts at it just to be too late anyways. Transgo and sonnax has great customer service and will walk you through this pain in the ass transmission and as long as you take care of it, you will never have to worry about it again.
just cover my background, I’ve been a mechanic for the pat 25 years but only recently got into transmissions and now that’s pretty much all I do anymore. I learn something new everyday and I love a whole lot more to learn. Peace and hair greese