[ZLRob]

Back with some more news. I went into the fold and replaced my transmission pan today using the modified 2019+ aluminum pan with the 1LE standpipe modification... Here is what I found:


Gen 1 filter while does measure shorter dimensionally at the shortest point compared to the Gen 2 filter actually holds its own in the dimensional arena due to other dimensional changes between the pans which I will touch on below.


10L90E pan rail (this measurement is fixed between ALL generations as the case is the same for all of us) depth measurement to bottom of Gen 1 filter taken at the open mouth where it will take in fluid- 2.05" or 52.07mm. At this current time I cannot provide Gen 2 filter measurement as I obviously do not have this gen (redundant anyway as these dimensions are already in place by GM)


Gen 1 steel oil pan depth from outside of pan to mounting flange - 2.432" or 61.78mm. Gen 1 filter has a gap of .382" or 9.7028mm by plugging in the measurements I supplied above and subtracting 2.05" from 2.432".


Gen 2 aluminum pan depth from outside of pan to mounting flange - 2.6875" or 68.262mm using a Gen 1 filter gives a gap of .4425" or 11.239mm.

By using a Gen 1 transmission filter on a Gen 2 aluminum pan there is a .2551" (1/4") or 6.47954mm difference between both pan heights with Gen 2 being the taller pan and being the slightly taller filter. This is beneficial for this mod as the Gen 2 pan being slightly taller allows for more fluid to be in the pan over Gen 1 and should negate any issue of the Gen 1 filter sitting slightly higher in the pan than the Gen 2 filter does. This is subsequently beneficial to doing the 1LE standpipe trim mod I did in my previous posts of this thread, as based on these measurements I can say with confidence that YES the filter bottom will sit well beneath the standpipe, so starvation is a non issue during driving.

The fluid I initially pulled out of the pan and filter was approximately 5.2-5 .3 quarts. This is based upon a 203-212* F temperature fluid correction level and is accurate to 2017's (possibly 2018's). What I placed back into the system was 6 quarts initially just as a starting reference point and after a 5-10 minute drive cycling through all gears then draining fluid I pulled out 5 quarts exactly after reaching the appropriate fluid correction temperature. Based on everything here I am actually estimating that the retrofit is going to allow me to run .3 quarts less than the previous Gen 1 OE set up (this one is hard to say, however, based on the fact that I never pulled the filter off the second time around, as everything was obviously installed and back in place with the new service facilitated set up).


Draining fluid, adding it, and correcting level is now incredibly easy thanks to all of the modifications that I made to the pan. After using AMSoil blue cap fuel efficient ATF (ULV equivalent) I found that the transmission is still more than capable of regulating it's temperatures properly sitting between 198*F while doing steady state driving like highway and a high of 208*F in stop and go traffic AND to boot, the transmission has NEVER shifted into gears easier and shifted between 3-4 upshift/ 4-3 downshift as easy and as seamlessly as it does now. to add to this, shifting is confirmed quicker via data logging going from .7 seconds under certain circumstances all the way down to .3 seconds.


I know this is a long post but I hope this helps someone. I will add more to this as time progresses, but all in all, I would say that this was a very successful mod. Given that the Gen 1 filter now sits in a Gen 2 pan I can confidently say that there is no worries about magnet interference (ie magnets physically touching the filter based on their respective fixed locations and given the incredibly negligible ultimate height difference between the depth of the two filters sitting inside the actual pan the chances of any starvation under any situation is highly unlikely. All of this and the pan itself is now capable of shedding heat much quicker and more efficiently and effectively due to it's all aluminum construction.





Flushes or any services are now incredibly express due to this new handy drain plug being added. Look how pink the fluid is after the second drain!




For reference purposes, this is the measurement of the Gen 1 standpipe.