@56arbee Hi, that is a great argument, I agree with the "Ravigneaux type" description even though the planet gears are not physically connected as in a traditional Ravigneaux gear set. If that is the case, then you could also argue that this transmission is actually a "Lepelletier Type" design which uses a simple input planetary gear set to drive a Ravigneaux planetary output gear set.

@56arbee That is what I thought at first, but a Simpson gear set has common sun gears and these are separate sun gears. It appears to be two totally independent gear sets with a common carrier housing. The two ring gears can be removed seperately.

Thank you! Awesome explanation. Subscribed.

excellent video/teacher to understand the automatic transmission

Correct me if I'm wrong, but at 02:12 you say that the rear planetary gearset has two ring gears. This being a Ravigneaux gearset, I believe it has only one effective ring gear, that being meshed with the long planet gears. The short planet gears mesh only with the long planet gears and the small sun gear.

Right about the common sun gear in a Simpson. I knew that too. Silly of me. However, after studying this geartrain more, I still argue that it is a Ravigneaux or as Gears magazine calls it "Ravigneaux type." Even though it has two ring gears, they are not on independant assemblies. Therefore, any action on one of the planets in contact with the ring gear will cause a like reaction of the other planet on the same axle. The two planets act as "long" and the two idlers as "short" planets.

Hi, good observation, however; this is not a Ravigneaux gear set. The common planet carrier does not have long and short planet gears as a Ravigneaux does. This planet carrier has two totally separate sets of planet gears that are not connected to each other. The bottom gear set has an idler gear set to reverse the direction.

Agreed. In fact, the ZF and the Ford 6R60 is the same design (but use separate 1234 and 3-5 R) housings.They utilize one piece long planets in the rear carrier. I forget where I read it, but I have heard them described as Lepelletier.

I maintain my 6l80 very well, at least in my opinion I take my truck to the dealer for major services to keep good paper trail and records filter replacement every 30k no flushes and this thing has been flawless I love feeling my shifts up and downward it tells me it's still there. If it's too smooth like any other transmission I feel its wearing clutches faster with the slower engage like dragging shoes on the floor versus picking up your feet when walking not sure if that's how it all breaks down but that's how it feels to me so far nothing but positive things from my transmission

It is amazing how reliable transmissions are considering how many moving parts.

The 6L80 can handle 430 lb*ft of torque, the 6L90 is more, but I don't have a specification on it.

When the 4-5-6 clutch is applied it drives the output carrier at turbine shaft speed,you can see this at 18:25,you have one solid shaft to the bottom of the output carrier.At around 19:25 you misspoke and said it drove the carrier through input planetary at 1.5:1. The turbine shaft is driving the carrier at turbine shaft speed through 4-5-6 clutch and the 1-2-3-4 clutch is driving rear sun gear through input planetary and 1-2-3-4 clutch hub at 1.5:1. The result is output internal gear is driven at 1.152:1

Nice

Excellent video. Not a fan of the 6l90e. Would rather just have a 4l80e with better shift programming. The 6l90e shifts erratically, sometimes shifting smooth, sometimes shifting slow, sometimes shifting to fast and harshly. Not upshifting when i want, downshifting when I don’t want it to etc. I have one in a Isuzu npr with the 6.0 vortec v8. I miss my old truck with the 4l80e. The 6l90e has very noticeable torque management or throttle reduction between shifts leaving all light or mid throttle shifts above the 1-2 feeling like a pause then shift then clutch sort of feeling. In the box truck it won’t upshift until about 2200 rpm which is annoying and if the rpm wants to go below 1500rpm it downshifts. That’s great and all if I’m towing a large amount but I’m simply hustling chips and sodas around town. When cruising at like 40 it should upshift to 6th to save gas, but it won’t it will hold 5th or even 4th and if I apply brake it will down shift and if I let of gas it will down shift. Basically it’s a pos. It wants to be a manual so bad but it can’t be. It’s a 6spd auto it should act like one. Plus it has an annoying torque converter judder in 2nd gear and the 4th gear isn’t even 1:1 it’s like 1.15:1 which sucks it robs power and isn’t deep enough to grab on a freeway speed down shift. It will catch 5th which is overdrive, than torque management will rob power in 5th. This trans is aids. When my boss bought me the new truck I was excited to try the 6speed but 4000miles later I’m disappointed. Surely it can’t be saving gas holding rpm all the time like that. And I’m not sure it will last very long. It might be a rock solid trans but it sure shifts like shit. I would rather have a new redesign of the 4l80e that didn’t upshift to 3rd at 20mph and would actually lock the converter in 2, and 3rd gear. As long as it lasts a while I’m happy but I have a gut feeling it might not. It’s just annoying because Isuzu only lets me select gears 1,2,4, and 6 and the programming on the 4 position is for heavy hauling it won’t upshift until 3000rpm even with the lightest throttle angle (and I mean like 10-15 percent, which is required to get the truck moving) Sigh...if it ever breaks I’m sneaking into the lot and putting a 6speed manual or a 4l80e with a shift kit in it. They probably will never know since they aren’t really car people. Oh yeah all this is normal btw for the 6l90e. Only thing it does right is full throttle upshift which I don’t like to do because I don’t like to go around flooring a company vehicle like that. It needs a redesign or a scrap imo. The new 6.0 seems like a solid piece but Gm should let the driver better control the truck. I don’t need it downshifting all the time like a boy racer when in traffic like that.

Unplug an electrical connection from these two transmissions,to the dealer to have them programed all over again with the Tech 2.Wipes out the info from the computer.Jasper does it on site when they reman them,they have a $100,000.00 test stand they program these on after you call them in to give them the whole vin.

Hi like your video good presentation I have a question my 2014 camaro 3.6 automatic trans I believe is a 6l 80 and my reverse doesn't stay in gear when I try shifting to reverse its just weirdly moves into drive in other words when I grab my shifter to place it in reverse it just slides into drive like avoiding the lick into a reverse shift I can't even place it so to speak in reverse all else is good I think the reverse may have been damaged when I towed it and it was locked into park because of a dead battery but we pushed it off the trailer and the wheels were dragging then snapped loose and started rolling please let me know what can be wrong.

how is the NEW GM 10 speed ??? any issues or problems ? i heard the 8 speed has issues

My 6l80 4/5/6 feels like neutral shifts smooth 1/2/3 and even into 4 and down shifts but 4/5/6 feels like neutral. I have a pressure switch stuck open code. I don’t tow with it or hot rod it I was interstate driving when this happen..... ??? Definitely getting some heavy repair cost 2800 etc only just over 100,000 miles

can you demonstrate the generation 2 6t40?

is this a Good Transmission ? just got a used Tahoe with this Engine ? mated to a 5.3L

How is this transmission controlled? I heard the controller is integrated into the valve body. What is needed for it to work? How is it interfaced with the ecm? Great video!! I subbed!!! Had to! To fill my thirst for knowledge!!!! Thanks for the information, and time and effort put into this video,,_

i work at stackpole and we make the parts on these its kinda cool

HAS THE ORIGINAL ONE.CAN U SHOW A VIDEO ABOUT THE GOVERNOR, PLEASE

I have a 2008 equinox sport with 6 speed auto with manual shift mode. When I put the lever in manual mode , will not work, what is wrong?

Somehow it seem that this transmission is less smooth on the 2-3 shift than any other. I can shift 2-3 quite well unless you ease the throttle during the shift. The other shifts work better if you are letting off the throttle.

Can you advise which transmission would best suit this application, mounting it to the engine??

hello i have an issue with my 6l80 that i have on my corvette there is no reverse and it got stuck on third and got two codes popping up p0776 and p0700 , what do u think the issue is please help me on how to cure this

thank you...

Will I have to change out the flywheel or will it work with the 6L80??

how much torque can this reliably handle?

Will a 2009 G8 LS2 Pontiac automatic transmission work on my 2007 Corvette engine!??

does GM provide cores for you to teach with? Help out the training of their possible future techs?

Will need a bell housing foe the 6L80E to mount on the 2007 corvette engine, which one do I use??

Regeneau planetary gear-set.

what is the differant with a 07 and a 09 trans [ with the 07 being a one year trans] 6l80

I HAVE A 63 CADDILAC WHONT SHIFT, ONLY FIRST GEAR, WHAT COULD BE THE PROBLEM?

The big difficulty is people cannot show the gear train schematic, and talk about its working principle. verbal talking of complex mechanical systems is messy.

6L90 is 625 plus.

OK, I see. Then it's more like a Simpson with a set of reversing idler's on one set of planets?

Hi

compare 8L90 to ZF8HP95

22:35 Have 1 a day blow a pump.

Bad gearbox, unreliable. I have it in my 2011 camaro SS, my mileage is 106.000 miles and gearbox is already kicking. The solenoids do not change, GM wants to make more money by selling the valve body assembly. All rubber bands are torn, you need to change a set of rubber bands. This gearbox does not like high speeds above 100 mph, since the oil pump is not designed for this. Why do you put such a gearbox in a muscle car if it does not fit a 6.2 liter engine?! I am very disappointed in GM

They couldn't even get the overdrive 4 speed autos right. I'll stick to the proven old school 3 speeds. These 6, 9, 10 speeds are stupid!

too long~

These are both GARBAGE