Transmission dumb ? of the day.
 

I want to know is there a reason or a draw back to drill qnd tap a hole in the center bottom of my transmission of my 782, so I can drain it without replacing the gasket. I know it forces you to clean out the rear end and it wasent cost effective to do it at company level. But it it something I can do or is there a reason it shouldn't be done? Thanks for answering my dumb ? Of the day.:bash:

Not a dumb question. I have toyed with the idea myself just haven't got around to doing it yet.

I know it's not necessary, but I replace my hy-tran every year or so. Oil twice a year and purge fuel tank and lines once a year. I like things clean, lol obsessive compulsive. The reason I ask is I'm restoring my 782 and adding 3 independent hydraulics. Cat 0. Power steering and super steer front axle+ a few other odds and ends. So I since I have it all tore down now is the time to mod things up. Need to start a new thread for it:bigthink:

I don't see a problem with it either. Beats taking off the rear cover to change the fluid, especially with the three point and other things in the way.

Just weld in a 1/2" pipe coupling (a half coupling actually) as low on the rear cover as possible at the low point of the rear end casting.
Then used a magnetic pipe plug that takes an allen wrench.

With a 3 point on it you still would not be able to drain it all out as the hitch would be in the way, why not drain it from where the suction line comes out of the bottom of the tranny. You could put a brass tee on it. It is only a compression fittings and easily adapted.

One could always put a round hole in the hitch plate where ever the cover plug gets located.
That would make it well protected.
Just seems it would be easier than breaking into the suction line which on my 127 does not suck off the very very bottom of the housing.
A horizontal plug in the rear cover would also allow one to "swap" samples of what is accumulating inside.

It must be so that it forces you to remove the cover .
In cars and trucks there is a black break -in grit that is produced after 5k miles, from the action between the pinion and ring gear , it coats the metal the heavier the vehicle the more is produced .
you have to spray it out with carb/ brake kleener to remove it or the bearings wear ealier than normal, just changing fluid does not do much. may not be needed on GT's though

Not saying that I don't like the idea, but how will you be sure that the inside is clean if you can't see in the case?

I've never paid any attention, is there an acceptable location on the bottom of the case for a plug?

Is it possible that drilling and tapping a hole in the case would compromise the strength of the case?

:bigthink:

Personally, I don't think one needs to open the rear end every time you do a hydra fluid change. Maybe, every other or third time would suffice. With a drain plug, it would promote more frequent fluid changes instead putting it off due to the hassle.