Stripped transmission drain plug

My trans drain plug 9034110006 I've determined should be a M10 x 1.5 and only has like 4 threads. Any longer shaft might hit something. That piggyback oversized plug looks nice but I don't think they make this size.

 

You have more options than you think- Maybe try looking for a mobile welder? Drop the pan, get the welder to weld a plate or bolt in, etc... Someone out there will help you. There has to be a fab or machine shop with a welder.

RE fluid- I successfully did a drain and fill with MaxLife. It has mixed fine with the original OEM non synthetic.

Don't over think the amount- Put a catch can under there- If it's metered, then it's easy- if not, just make a mark on the side of it, empty the catch can, and then refill it with new fluid and pour that amount back in once the pan is fixed and sealed back up to the transmission. I drained 4qts from the pan.

 

That screen in tranny dont filter much....maybe if everything is falling apart with chunks of metal....
So with that being said.....there's no problem sealing that plug.....
.....and then every 50K or so drop the pan and change everything...
no big deal......

I stuck on one of those 30K mag filters inline.....

I have a hydraulic suction pump with a long straw.....I just stick down the dip tube and suck out 2 qts ATF every 10K....
I do same with steering reservoir....once year suck it out.....replace that pint.....

I dont see me taking that plug out again.....all that gets you is two qts....

 

There's only two trannys on these trucks....
a43D's and 340e's...

My local transmission main supplier has all the parts for these.....and can even order a whole rebuilt one......

 

Would the Dextron VI synthetic fluid not last longer than the Toyota T-IV, the same way synthetic engine oil lasts longer?

 

I like Valvoline MaxLife

Valvoline MaxLife Multi-Vehicle Full Synthetic Automatic Transmission Fluid (ATF) 1 GA - Walmart.com

 

It was little expensive to flush whole 9 qts out....
think I used 4 gals to do it.....
I pulled the line off the trans cooler to do a complete flush.....
there's vids on-line to show how.....

 

Wait, are you telling me I have to flush out my system somehow to put in Maxlife? Obviously I don't want to do that. I just cancelled my order of Toyota T-IV because you were saying Maxlife is better, and I actually don't want to depend on having to get the Toyota again in a pinch. I had OReilly Dextron synthetic in there before which is supposed to be compatible. I thought I read somewhere that getting a Dextron-Mercon version is a bad idea. I've been researching this for hours and all I can find is people debating about the choices and getting confused about what is compatible with what year, everything theoretical and nothing conclusive about what really is going to last longer or be better.

 

Not sure you have to worry about what is better. Better is a relative term. ANYTHING is better than 20 year old original ATF. Since it looks like you've done a previous drain and fill I'd match whatever you used in that process. No need to mix more than necessary.

 

This was going to be my recommendation as well. That $120 Time-sert price is insane, you can buy a stick welder on Amazon for ~$80 and weld in a bung.

$100 HONE Stick Welder, 110V/220V Actual 140Amp ARC Welder Machine, IGBT Inverter Digital Display LCD Welding Machines with Hot Start Arc Force Anti-Stick, High Efficiency for 1/16"-1/8" Welding Rod.

https://www.amazon.com/HONE-Inverte...&qid=1670955019&sprefix=welder,aps,117&sr=8-6

$8 SecosAutoparts Thread 12mm Heigth+18 mm Diameter Steel Bung & Plug + Washer Kit Transmission Sump Drain Plug (Weld In)

https://www.amazon.com/SecosAutoparts-Transmission-drain-STEEL-WASHER/dp/B097PCN9C7

 

Done! The pan hole was fine after a tap repair and taking care to get the shavings out. The plug was the main thing that was gone. I don't know how it was even staying in there at all with no threads.

edit: Also it was roughly 3 1/2 quarts to drain and fill. Bolt size confirmed M10x1.5. It's running fine with Maxlife mixed in with DEX-VI, and Lubegard added.

 

Yeah transmission system is very complex system.....

only about half of the fluid is actually in the transmission....
and half of that is stuck up in its passages......so that means about a 1/4 of it sits in the pan......

The other half is in rest of system.....the lines, the cooler, and the about 2 1/2 stuck in the torque converter alone......

it is very difficult to get all that out with creating a liability situation.......

Its generally unacceptable to mix anything modern/synthetic with anything old school.......petro based.....

And as far as everybody has to just jump on the synthetics bandwagon is bullshit.....
doesnt matter what you use.....just as long as you do it often........
synthetics shouldn't a substitute for lazy.....

 

These transmissions are getting very expensive and hard to get....

I can score a block and new head cheaper than what I can find a tranny for.....

 

Glad you got it fixed!

 

Untrue. Currently on my second drain and fill with MaxLife. Undoubtedly there is still original non synthetic ATF in the mix, and there still will be after the third drain and fill.

 

I bet mixing with every type compatible for a vehicle happens all the time. I have no idea what the shops put in on previous changes.