GM 4L80-E Transmission Rebuild - Transmission repair 

I just got done building my 4l80e, while watching this video. Never even opened one up before. You took all the guess work out of what you were doing. Nice vid and thanks a lot for taking the time to post it up!

This is the best 2 hours I have spent on RU-vid in a long time Hiram. Thank you so much for sharing this with us. You give the novice and DIY guy an idea of how much time it takes for the seasoned professional to do the job. Many techniques used here apply to other transmission rebuilds. Great info for the new and the experienced rebuilder. Next video, would you highlight some of your tooling for us? I would like to see which brand and style of snap ring pliers you like most and why. I would also like to see more of the shop tooling and facilities too. I have the same issue with my workbench lighting here. The workspace is well lit for the eyes, but not so great for pics and videos. If you know anyone with a studio lighting kit, such as an ARRI setup, invite them over for an experiment. Upload a 5 minute test video for comparison. Awesome work!

Thank You so much for giving your hard earned knowledge and valuable time sir.

Wow, That's the best video I've seen in a long time. Thank you so much. 2 hours of your time. Much appreciated.

There is no way I could have gotten my 80e build and back on the road with confidence with out your help! Thank you so much for taking the time to do this and keeping the hotrodding diy vibe alive and well

I recently just re-built my first transmission almost 100% from following this video along the entire build. I used the ATSG manual to help with specs and such but other than this this is a fantastic how to video, and Initially it was this video that made me confident enough to tackle the 4l80-E in my 1 Ton 4x4 K3500. thank you very much sir!

Excellent video. You spent an enormous amount of time documenting this. My only recommendation would be to NEVER drill anything at your assembly table. I cringed when I saw you drilling out that drain hole in the pump casing on your assembly table, right next to an open bucket of assembly lube. Cast iron dust is extremely abrasive and goes everywhere. Best to do all the drilling, grinding and filing at another table, or even better in another room. I am a machinist and know nothing about rebuilding automatic transmissions. Thanks for sharing your trade.

This is a great video! Especially using ordinary shop tools instead of the high-dollar specialty ones the rebuild and service manuals lead you to believe you can't get this rebuild done without them. I wish half the stuff I learned mechanic wise was explained as clearly and concisely as this video explains the 4L80E! Thank you for working on this and posting a great reference!

I wanted to say a genuine thank you for making these videos you are helping people

This video was amazingly informative and highly detailed, Hiram! Thank you so very much for all of your help in guiding me through the process of tearing down and rebuilding my 4L80e. I never once imagined the task being so straightforward.

This video has been more help than you can imagine. There are things in this transmission that were not in the older ones, and the books fail at that point. Thanks for posting this, it's excellent reference material!!!

Hiram you're awesome! Thank you for taking your time to teach your immense knowledge. I really appreciate what you do and your videos have taught me a lot.

Rebuilt my first 4l80e transmission using this video and it works like a top. :)

I have watched your videos before and I have rebuilt a 4L60-E thanks to your very simple and widely explanatory shots and tricks. I am now really looking forward to rebuilding my 4L80-E in my dually because I feel more than confidant to do the complete job and know it will be proper! Thanks Hiram!!

Hiram, I want to thank you for posting this video. I found this and one other to be the most informative and helpful for disassembly/reassembly. Just completed my own 4L80E in my RV and installed the HD2 shift kit and Sonnax fix it kit. Mine had the ubiquitous no reverse/weak reverse. Tried to fix it by working on the actuator rod and reverse piston. Did not work so total teardown. Found the direct clutch seized to the hub. The piston was eroded/ worn out and caused partial engagement of the direct drum which roasted the frictions and steels in the direct drum. Got it back together yesterday and it runs great. Shifts smooth and firm. Could not have done it without you. Kudos.

Hiram is the best. you can tell he has done many of these. I rebuilt mine after watching him do it several times. My trannny works flawlessly. Thanks Man. Couldn't do it without you.

Hiram, you are the man! I couldn't have done my recent 4L80E rebuild without you, bud. Thank you for the best 4L80E video on the internet...

thanks a lot Hiram for taking the time to make these videos, ive been starting to do transmissions on the side now for a couple years, and had very good success because of your videos, thanks again

Your video is AMAZING!!!! So glad you made it! You are a great person. I rebuilt my whole transmission with your video. I tried with the ATSG manual and made it a page. With your video it was honestly a piece of cake. You showed honest great tips that they dont show it the book and you proved that all the special tools were not needed. Do you have a paypal I can send you some money to?

A million tear down videos, very few real build videos , 110% thank you .

Thank you so much for your videos! Thank you for showing your mistakes as well. So often people aren't willing to show this and believe it or not it's valuable to see them. Best Regards to you!! You Rock!

Can't add anymore positives than has already been said. Hiram you are a class act. Thank You.

Thanks for this! Finally got everything back in my 4l80e thanks to this video. Appreciate it!

loved the video. just spent 2 hours on my saturday watching start to finish. my 95 gmc has this unit and i have an old one in the garage i was thinking about rebuilding now that i've done an engine swap. i really like how you used regular tools anyone has to get the job done. great job!

Hiram, I enjoy your videos. I love watching a master at work!

mad respect to you sir!!!! thank you for your time and sharing this video!!!!

I'm 1:18 minutes in but it's by far the best video. I'm confident I'll have no problem building my 4l80. Thank you

Thank you so much for this video. This was a HUGE help in getting my transmission back together. Excellent job, two thumbs up.

this video is very much appreciated...it truly helps the middle class save some money while there already down with a hurt transmission, thank you Sir for your great video

Eres un genio. Me doy cuenta que hablas castellano. No entiendo nada de transmision pero te encontre de casualidad y ahora me he subscrito. Gracias por compartir tu conocimiento que para mi es muy valioso y veo que trabajas con todos los detalles que lleva este trabajo. Un millon de gracias!!

The commentary in this video is GREAT!

Superb video bro! This is a very good starter video for a DIY'er!! A lot of tips thanks! No worries on the mistakes, video is A+

Very detailed information about 4L80E transmission. Am very exited

ive been subscribed to you for awhile. Your a great people person man i think your a great guy for uploading this for the guys that dont know or want to learn.

This is just awesome, im planning on buing a junkyard 4l80e this just sealed the deal :)

Great job Hiram!!! I just completed on with your help and advice and it came out great. Thanks again for this video and your channel in general.

By far the best 4l80e build video on youtube. Thank you

props, most people do not want to display assembly. Takes a lot of effort.

Give the best knowledge on the Internet about transmissions thank you

Thank you. I've built transmissions for over 20 yrs and I built so many that have original bushings in them. Had guys tell me oh they're ok they're not failed or worn. BS! Replace them.

Your sealing ring trick is awesome. Just finished my build . I used a good amount trans fluid/trans gel mix and just slid it in gently and let it sit

Awesome video my friend!! Clearly detailed explanation of all components and function. One of the best on utube!

It was a joy to watch your craftsmanship..

2 hour long video but I enjoyed every minute. Please keep them coming!

Forget about the Beer Belly dude you did a Helluva~ job with "Technical Highlights about installing Bushings - Seal Rings & Piston Seals!" Ride-on Bro.

I really enjoyed your video. I carefully watched every step you made awesome training tool.

Very explanatory and answered all of my questions. Thanks!

I've done a 4L60E and a 700R4 (basically the same lol) it surprised me how different this unit is. I'll be into one soon, thank you for this video. I'm alot less scared and lost lol

Another great video! Lots of useable ideas here. Thanks Hiram!

LOL! First thank you for taking the time to make this video! Second and this may seem strange…….. I am hooked on the “Atta Boyyyy”!!! I have been a professional mechanic for well over 30 years. I have slowly been taking on more and more transmission work and the shop I am working for now has been very supportive, even though my speed isn’t quite there yet. Anyway I find myself pushing through things I get hung up on and giving myself an Atta Boy now!!! It’s crazy but it kind of helps!

Great video! Thanks. I'm about to rebuild my 80e.

legend most useful you tube video i have ever watched

Thank you for great video's, I enjoy watching them!

Muchas gracias por demostrarnos como se reconstrulle esta transmission la demostracion fue muy illustrative.

Thanks a million and I’ll let you know how it went. Great videos please keep them coming. It’s a blessing that you would upload them for other to learn. I live on the island and we don’t have classes that go this deep. So I say again Great videos thanks a million.

Amazing video, You have true skill!

I watched this video and referenced this video while assembling mine. Thanks for the awesome video...albeit, I'm not done. lol I will say, a video on bushings would be nice

Awesome job! This video helped me enormously! Thank you!!!

Really liked the video Hiram. I don't know how you managed to work so late and then not drop any F bombs after the check balls and manual valve engagement issues. I didn't mind the length one bit. You helped me with my 4R70W build. Keep 'em coming!

I enjoyed watching this Video, You were easy to understand and I learned a lot !

it's very hard to find the pearl like you that share it's very odd to find a pro like you that share knowledge knowledge

I I really thankyou for your video I did my 1st. 4L80e transmission whit your video. Thankyou very much

I'm from Indian this video is very helpful for me thank you so much sir

It was a cool video to watch !!very informative!

that was a great video i watched it all sure helps understand transmission more.

I watched your videos many times. you are a great professional. it's a privellege

Thanks for showing the orientation of the inside seal of the direct clutch. I was suspicious of a previous rebuild that had the seal in the wrong way.

awesome video, just what I was looking for!

Thank you for sharing your knowledge. This is a great video thanks

great Work. thanks for sharing this great info and your knowledge ..!!!

Awesome video!! helped me so much. great job on the video. keep it going!

thanks for sharing your skills

good video practice for me., I very like your style repair., I am from Thailand. Thanks very much.

Great Video very helpful ur now a Fav

Awesome video mate, very informative. From down under 🇦🇺 Australia 🇦🇺...... Cheers 🍻

That little 12V drill is the best................Great Vid, bro.

im just watched this ,i have a4l60e on bench,thes vids will lead me thanks

This is what a professional looks like.

i hope this guy makes alot of money. skilled labor is never appreciated.

so glad to have found this video! I'm building a 70 K20 suburban. it's daily driver but that old 3 speed has got to go! I have a junkyard 4l80e waiting to be built and now I plan on doing it myself! Hiram is my new hero! (^=

thanks for making these videos I'm studying to rebuild transmissions and your videos help me a lot I always push like You're number one in terms of video transmission repair keep up the good work Hiram thanks .

ive said it before and will say it again, I appreciate you doing this video for us hiram, I only have 1 transmission but I make sure to watch all your videos to show my support and love to watch a master at work, Thanks again sir couldnt of done it without you

great! video buddy... keep up the good work

How do you remember all that you are a absolute genius!!!!!!

this is great..Mr. Hiram ..your the bes,t thanks...my trans just went out....i'm going to a junkyard...and get me a used trans 4l80e..and do a rebuild..

Great job . I have fun with your jobs . Outer boy !!!

Thanks for the videos. I know its a lot of work.

I think that is exactly the same transmission I have in my 08 GMC van. It gives me an idea of what I would deal with if I rebuild

WE WANT THE ALLISON!!! Haha I remember when we did one of these, these are pretty beefy :)

great video. much appreciation

Excellent video. Thank you.

Awesome job brother

great work man

for the drilling i use bar soap to lube the drill bit and catch the chips

Thank you sir very much for making these videos

thanks for your good work...

Much appreciated, thanks for this video!

Hiram you made that 4th clutch housing seal install look easy. Sometimes hold it against my beer belly LOL 😆 Great video. Keep up the good work 👍🏻

I loved video Hiram. I have never been inside the 4l80. Looks just like a 400

God bless you maestro!!!