need info on tranny drain bolt

[flight doc89]

wweeeeeeelllllllllll, i stripped out the hole and want to helicoil it, but i don't know what size the bolt is (i'm stupid, sorry). has anyone done this before, and does anyone know what size it is. i found some helicoil kits here.

[f00g00]

If its not a total loss you could try to just re-tap the threads. Take the bolt or plug to your local home depot or other hardware store and for less that 10 dollars you could probably find the size you need without buying a whole tap and die set. Heli coils are best reserved for a machine shop to do, they have to drill the old threads completely and insert the coil. Its not a job to be done by someone without the proper tools. There will probably be metal shavings from the drilling which I don't know how you could keep them out of the trannie completely so just re-tap and you should be ok. Not sure which trannie your talking about though. If its the manual which I'm familiar with then you must be talking about the plug on the side where you check the level. It wouldn't hurt to run the threads of the plug/bolt through a die either cause there could be some damage from the trannie threads.

[IHateHacks]

I hate to hijack this post but, the same exact thing happened to me. Must have been the hack that last put his worthless mitts on it because it was sure as hell on there pretty fuckin tight. Must have used an impact gun to tighten it. People that use impact tools on aluminum threads should find another job, for real. You know they make torque specs for a reason....

Changed the fluid 3 months ago, noted that the plug didnt hold the specified torque of 30 ft/lbs, but said whatever. Noticed it leaking today.

I used a 15/16" wrench to take it off and put it on but Im sure thats not the right size and seeing how my mm set stops at 22mm I have no way of knowing if it is in fact mm.

Last time I checked, they dont even make helicoils that big, biggest ive ever seen was M10 and this trans drain plug is at least M20, probably bigger.

So does anyone know how to solve this?

Edit: Ok found these sizes

M20 x 1.5, M20 x 2.5, M22 x 1.5, M22 x 2.0, M22 x 2.5


So the million dollar question now is, what size are the drain plugs threads?