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4l80e drain plug and filter

Discussion in 'GM Powertrain' started by dsfloyd, Mar 31, 2012.

  1. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner Gold Member 1000 Posts

    So my 4l80e has a drain plug on it (GM love the stupid T55 Torx that just strip out). Well it wont budge. I am planning on eventually taking off the pan to switch out the filter (question on that in a minute), but wasnt going to do it right now. I was going to drain and fill (about 8qts) drive for a little then repeat at that point giving it about a 75-80% new fluid (even though 16 quarts had been put in) since it is mixing with the old fluid that is in the torque converter. On the second time is when I was going to switch out the filter. I did some penetrating oil and heated it some, didnt want to do too much as I dont want to mess up the aluminum (i think) pan. I am going to try and use an impact gun slowly increasing the torque as I can adjust my gun, but once again dont want to mess up the pan.

    As far as the filter. what do you all recommend. they have the basic kits with filter and cork gasket. found one that is premium filter and a coated metal (oe style) gasket at about $70 or just the filter with gasket maker. Do some of you just swap out filter and use gasket maker or just buy the cheap gasket. Looking for what seems to be the best for not having a leak afterwards but if just a gasket is leak proof enough that is a little cleaner.
  2. Boonduff

    Boonduff Member 3 Years 100 Posts

    I've always used a gasket with no sealer just a little Permatex High Tack to help keep the gasket in place while I bolt up the pan. The key to no leaks is to make sure the pan flange is perfectly flat and don't overtighten the bolts which can squeeze out the gasket.
  3. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner Gold Member 1000 Posts

    Thanks. I had no luck getting the drain plug off even with an impact gun so looks like I will be dropping the pan. I was hoping to not have to do it twice but thats life.
  4. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner Gold Member 1000 Posts

    So I ended up dropping the pan and changing out the filter today. when i had the pan off I figured I would do the penetrating oil on the threads from the in side. Heated it up and all I ended up doing was completely stripping out the torqx socket on the drain plug:grrrrrr:. So looks like using the drain in the future aint gonna happen either.
  5. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner Gold Member 1000 Posts

    So for those with the 4l80e how much do you usually refill after a filter change. the Haynes manual says 7.7 qts but that is more than came out. I captured 4qts and spilled some but probably no more than a quart or so. definately not almost another 4. I am starting with 4 quarts and will add from there just wanted to see what the typical amount was.
  6. Sierraowner5.3

    Sierraowner5.3 Rockstar 3 Years 1000 Posts

    to bad you stripped it, i was gonna suggest getting a torx into the plug, then pounding (lightly) on the plug. hammering on it towards the pan might have broken it loose. to late now, something to think about in the future.

    a trick i picked up working on the farm. not sure why it works, but it can help. heat and penatration oil usually are enough, but this is something else you can do.

    Alex
  7. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner Gold Member 1000 Posts

    Thanks. Ive used that method in the past on something else. Forgot about it here.

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