Thank you very much for this. Currently building a 4l60e with approx $4500 worth of parts and it has been a pain... All of these new/upgraded parts cause major incompatibility issues with other parts. The process is similar to a nuclear fission reaction in terms of the compounding effect of the problems. My original output end play was 60 thousandths, and input end play was 49 thou. I used the sonnax reaction shell, reaction shaft and front 6 pinion planetary. I took the trans back apart enough to pull the output and remove the reaction shell/sun gear. I reassembled using the included Sonnax shim this time, and went from a #69 input shim to a #71. Now I have zero input endplay (turns properly), and 45 thou on my output shaft... The math doesn't even add up so now I'm at a pretty major loss. I even got walked through the process by a Sonnax technician over the phone to make sure my stack-up was correct, which it was. What made me suspicious was the sonnax instructions that ask to ditch the plastic thrust washer as well as the 4-tab copper thrust washer inside the shell. They reaffirmed this to me. I am a performance manual builder but this is admittedly my first 4l60e. Now that I have watched your video I will go back to it tonight with a different approach. Thanks again for the intuitive and in-depth view into this subject. It has changed my perception on how to approach this. I know that you're a diy guy, but I can tell that you would be a very good builder if you ever decided to do this for a living. Very thorough and you put forth considerable effort into actually understanding the parts and how/why they work together. Most other builders in my area lack the discipline, care, or plainly their mental capacities to broaden their level of understanding. They are just glorified broken part replacers. Anyhow, wish me luck!

Men you Are Awesome better than GM Tech ., thanks for being sharing , I couldn’t figure out., but now I’m going to finish my Transmission, thumbs up 👍

Thanks for the Help Brother.

I too bought that sonnax shim, and said wtf? Anyhow, i believe it fit perfectly under the Torrington bearing on the rear planetary set. I only installed one shim, and it landed me in the middle of specs.

New subscriber bro🔥🔥🔥🔥

As we can see (usermanual.wiki/Sonnax/7740610In.1760135194.pdf ), sonnax 77406-10 is made to reduce rear endplay. If i understand correctly, it-is movement on 13:13 in your video. But how we have to measure it? I don't find any instructions

@user-zh9hu8mf5u

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Sorry, I was wrong. It will reduce total endplay