Very interesting!

@@PineHollowAutoDiagnostics Would some kind of pressure test show this up?

In ZF gearboxes the hydraulic valves operate almost like a darlington array with tranzistors. By switching the current you operate a small valve/solenoid which reroutes high pressure oil to a bigger/stiffer valve which then operates the clutch. And there are 2 types of valves - normally closed and normally open i.e. two different types of logic.

Yep, reliability is a solid reason to buy a manual car. Unfortunately, apart from basic vehicles, manuals are seldom found these days. Shame, but such are market trends.

i've seen this same failure in three different chevy transmissions, 2 were the 4L80E and 1 was a 4L60E, all three were caused by physical damage to the parts in the transmission. In 2 of them one or more clutch plates had welded themselves to the steels in the forward clutch pack, just like you had mentioned. i know this A650E transmission isn't the same as those chevy's, but how it operates is very similar. I'll put a link to a service manual for the A650E in a comment below this one if anybody's interested.

Maybe just needs a valve body but only a professional could verify that. I’d take it to a transmission shop.. have them rebuild and get a decent warranty for 3 grand.

What did you find???

Remember the solinods operate valves which direct a volume of fluid. It is probably a valve problem, or valve body internal leak where pressure is going to the wrong place. Most transmissions failures (in unmodified cars) start as a valve body issue which then goes on damage the rest.

Except it self-fixes after 20-30 min of driving.

@@additudeobx probably the hot fluid softens the seals which reduces the leaking

I'm like you, I do mechanic work for a living, but not a transmission specialist. I can tell you that the last Aisin transmission I tore apart, never got put back together. Just got replaced. And after a full teardown of the old one, could never find anything wrong with it. It should have went in D and driven fine. It was clean, well maintainted, the clutches looked great for 200k miles. The valve body was fine, all the valves moved fine in their bores, with the exception of one torque converter lockup valve was a tiny bit sticky. It would go in R just fine, well it would shift into any gear fine, but every few seconds the trans would lock up and stall the engine, violently, then unlock.

Yeah it was a bit frustrating haha

Needle in a haystack these transmissions are usually bulletproof change the fluid and you solid some take the abuse but not all parts are made the same

@@PineHollowAutoDiagnostics Any history of service/rep/repairs on the transmission during its lifetime to date.?

Ivan has to be nuts to try and change the transmission on that particular car without a lift. You have to be a masochist to want to do that.

@Pine Hollow Auto Diagnostics Can’t wait to see what happens next. It’s the next day and I have been thinking about this case. Maybe because I had a pretty easy week at my work. Lots of very familiar older model boards I have lots of experience with already. I do have an interesting 2018 model with one of those weird unhonest clients if you care to read about it. Not unhonest like cheating me off a repair or diagnosis, just unhonest with the history of the machine. The machine turns on and almost boots, it just crashes at a certain point. 100% reproducible and happens identical each time at the exact same point. I am already thinking corrupt OS. I open the machine and see somebody has been there before. They say the board was reworked by apple. Lol Apple does not do much rework on boards. Even less leave lots of flux and uneven amounts of solder on the pins but somebody reworked cpu mosfets. No idea why but it did work so they did an ok job I guess. 🤷🏽‍♂️ It just doesn’t make sense why go for the mosfets considering the symptoms. Cpu is working fine and diagnostic mode (shows error codes similar to cars) shows nothing. Then I see there are signs of old liquid damage by a clock signal. That’s the real ‘durp’ moment that guy had. He already fixed the board by cleaning the clock signal area. When it got wet the interruption of a clock signal while the machine is running is a great way to corrupt data. It probably just needs a fresh install of the OS. Just waiting on client to ok the wipe. The mosfets didn’t need to be touched in the first place but I fixed the mess they left anyways. And that was my most interesting case.

Can't win them all lol

Most all Lexus cars of that era and vintage, the seats and interior look like that. If the car was not garage kept. If it's been parked outside most of it's life, forget about it. Something about that era of Lexus leather does not mix well with sunlight.

@@jtjones4727 I did not know that. The few I've looked at were very well maintained and now I'm guessing garaged because they were beautiful inside.

Some of the older GM front wheel drive transmissions are ridiculous with check balls. The first transmission I ever tore apart was from an '87 Oldsmobile Cutlass Ciera. Boy I was in for a surprise when I started taking layers of the valve body apart. There must have been 50 or 60 check balls in the floor when I gave up and said, this transmission ain't getting fixed.

The car is probably long since done and gone I think these are filmed way in advance but you're 100% correct I put $100 bill on the front clutch being burnt together!

Very interesting! Not sure of the history of the car. Perhaps a trans coolant hose burst, leaked the fluid out, and caused delayed problems for the future owner haha

I’ve seen this happen on both a Tundra and a Corolla. Both times they were run extremely low on ATF. Both times due to poor workmanship from other shops.

Good point, worth a try before a rebuild.

Was thinking the same thing a clutch pack is welded together.....

Yeah i totally agree. We had a Chevy 4L60 do that just a few weeks back. It was bound up in multi gears because of a welded/galled clutch.

Ivan when you have a transmission reverse problem the first place you check is the manual valve the manual directs transmission fluid to the appropriate hydraulic circuit in the transmission based upon the position of the shift lever you went the wrong direction and your troubleshooting

I think part ORDERED, but PHAD did the exploratory surgery BEFORE HE TOOK DELIVERY of new part. Probably cancelled order.

Agreed.

Don`t think so, if that was the case the transmission would of locked and the engine would of stall

@@pk6336158 Won't stall the engine unless the torque converter lockup is engaged.

@@RobertHancock1 sorry I meant like torque converter stall, where you mash the gas pedal, engine revs to 1500 rpm an won't move because multiple gears are engaged at once

This. Might be a shuttle in the valve body or might be a defective/stuck clutch piston. Either way, probably more cost effective to find a good used unit or a reman.

@@mejesse809 😒 I guess you must have not watched the series were he tore a transmission down to show us what went wrong inside. Most mechanics or technicians and shops I know won't touch a transmission with a 10' pole.

... and while I doubt it's the issue here.. I've heard that these boxes are very finicky when it comes to the transmission fluid. Apparently shift quality can suffer when the incorrect fluid is used. Toyota type 4 or an equivalent is the way to go.