drain a 7f 727

1

1hc72

Member
Hey guys I lookd but couldnit find how to drain the tranny fluid for the tf727. I found my leak. It isnt the front seal like I thought. Its under the tranny where the bolts are, ill see if I can uplad a pic so yoiu know what im talking about. All I need to do is drain the fluid and replace that gasket and no more leaky tranny!!!, so if any one can tell me how to do that I would be for ever gratefull
 
Just drop the pan, messy but thats how you do it. Most, while they have the pan off will but in a drain plug.
Ron
 
Just by dropping to pan you will not drain the tc, I usually get 4 to six quarts for the tranny. Put in 3, start engine, tranny in neutral and warmed up the check dip stick and fill to the Mark on dip stick.
When you have the pan off change the filter and check the pan gasket area, your looking to see if the bolts have been over tightened. If it looks like they have hammer gasket area flat again, the bolt holes get cone shaped when over tightened.
Ron
 
I looked one up on the internet this am and found one for $8. Any good parts store should have a "drain plug kit for a tranny pan" I think I would want one welded in, with that said I don't have one in mine but I don't take it off that often, once every 2 years or so.
Ron
 
looking to see if the bolts have been over tightened.
Click to expand...
Another thing to do when you find that the threaded hole has been "crowned" or the 1st thread has been drawn up in a small ridge is to draw file it flat again. Gotta be real careful on soft metal like the aluminum case, use the the biggest flat file that'll cover at least most of the flange and have a "smooth" cut or "1st cut". With a countersink bit in a drill motor, chamfer the hole a tad. This will assure a flat surface all across the flange and reduce the tendency to ridge the bolt hole again.
I do this on reassembly for manifolds, pan gaskets, block, or transmission cases, and sure cuts down on or prevents leaks. On through holes where the bolt is exposed to the oil or fluid, put sealant on the threads.
 
Be careful when you see the surface thread has been pulled out because the others above it have moved the same amount and are probably ready to shear and pull out completely. Be gentle when tightening. Aluminum is fairly ductile but it has limits and would be good to helicoil any questionable threads.
 
Imho it depends more on how you drive, towing, off-road or hiway. Atf can last 50k to 100k that's what I have read but if you use your tranny hard and the operating temps are higher you should do it more often. I try to do it every 2 to 4 years whether it needs it or not and mine is a daily driver.
Not a definant answer I know. The manual gives a mileage number but I don't have it in front of me.
Ron
 
Hey guys thanks for the help, got the fluid, gasket(original metal)and filoter chnaged. Filter was black, tranny fluid was a nice pink color, just like it is supposed to be, thanks for all the help!
 
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