Currently rebuilding my th400 out of a 86 k20 and there's a washer that's shattered in the piston cup in the accumulator. Hopefully after a rebuild that's it. This channel is awesome.

Thank you for posting. I bought an old truck that's been sitting for a while and just discovered that someone was probably in my transmission. The rear-low servo cover was missing two bolts, but they were in the pan. So at least thanks to your video I know what to check next. Hopefully the piston is still in there 🤔

You missed the most important thing

When I rebuilt my 4L80E I used the Sonnax adjustable pin. I installed the pin with no washers. All I did to test the adjustment was press the piston in 3/4 of the way to full seat, which caused the band to engauge enough that I could not turn the out put shaft by hand. Pushing the piston in all the way definitely put a grab on the direct drum.

I put a good many of Transgo's kits in and they had an even different method a adjust the servo pin. In the kit were several washers, they want you to remove E clip and piston, and stack 8 washers on the pin, and re install piston. Now put piston/pin assy into the case and press down hard, the cover should rest against case. Remove washers on at a time until it sits flush, remove two additional washers.

Thank you Shawn. I hope you have a great Labor day too!

I really enjoy your approach and explanations. Great video sir!

I like to neutral drop into reverse at 9,000 rpm,if she holds and fries the tires we good to go :)

thanks shawn great info...ironically i just welded up 50ish pins for 4l60e's cause the long pin is like 45 bucks and i hate the gold rings that transgo wants you to correct loose bands with... i do my own visual adjustment aswell even tho i have the j tool ...i used it once to confirm that its close enough and using the j tool on 4l60s is time consuming compared to a quick visual apply....i have a dozen or so videos to upload about 60s mostly for my customers about installs just have never been happy with how they came together

So would you care to discuss the remedy for a banging into reverse? I ordered a Transgo kit that said it cushions the reverse and I wonder if you are familiar with that product and what it does. It appears to be a pin and several springs.

Great video and I learned something. Keep this style of video coming for the new guys 👍

Appreciate this video

Great info , Thanks, Have a great holiday

Good info. , thank you,

very informative. thank you

Great Job!

After many hours of videos, I'm ready to put my tranny back together. How lucky I am to find your channel. I just subscribed.

well done shawn

with the manual valve body modifications you made a video about do you need to do anything with the rear servo? of do you just put it back together like stock?

@Shawn what do you charge to rebuild a transmission?