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Thread: Transmission Pan Drain Plug Kit
09-06-2010, 03:20 PM #1
Transmission Pan Drain Plug Kit
91 Suburban 5.7 4L80E
Soon I'll be changing the tranny filter out and replacing only the fluid lost from the pan. No intentions of a flush, the fluid looks and smells good, and the tranny is working fine, just a preventative maintenance measure. However, the pan doesn't have a drain plug and I'd like to install an aftermarket plug kit.
Where should I drill the hole? It looks like there is a slanted area that would be perfect for a plug, but would it be better to go straight through the bottom?
Theres a circle on the bottom of the pan that holds the magnet, so I'll stay away from that.
Small issue, but wondered what other people thought or their experience.
91 Suburban R2500
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09-06-2010, 11:14 PM #2
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If that slant is what i am seeing in the middle of the pan i would try to get it to fit there, that way there is a bit of a cup that will help the old fluid come out.Mike
1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).
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09-07-2010, 07:04 PM #3
i wouldn't worry about,its not that hard to let the pan tilt to drain and how often do you plan on draining it? and you gotta drop the pan to change out the filter anyways right?
i just did the tranny filter on my 03 and its got a stock drain plug that cant be used..... i mean i cranked on it, lubed it, even heated it a bit and nothing. iw as scared that any more torque on it would twist the pan, and we've run into the issue time and time again with the newer gm's and the shop i work at.03 Silverado 1500
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09-07-2010, 08:00 PM #4
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The first thing, is are you sure you have a 4L80E? I would think you probably have a 700R4, which probably wouldn't have a drain plug either. In the even you do have a 4L80E, you can go to the junkyard and pick up a pan off a 1-ton truck that has a 4L80E. A lot of them have drain plugs dead center of the pan, with a T-60 head. I know my uncle's 99 1-ton dually has it. That would probably be cheaper and easier than installing a bung on your existing pan and installing a drain plug.Christopher
1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 199K miles
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1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half
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09-08-2010, 12:05 AM #5
I'm pretty sure its a 4L80E, based on searches on the online autoparts stores its the only tranny available for my truck, it does have the enormous wiring harness attached to it, and the 17 bolt pan. Also this website has some info:
The slant in the middle of the pan seems like it may have been put there on purpose, so I might head that direction if I can't source a cheap/easily removed later model pan.
I'll be changing out the filter every 2 years barring a failure. And when it comes to the tilt method, for me, historically has turned out messier than I would like.
I was thinking I could drill a hole(carefully using a stop on the drill) to drain the fluid initially, then change out the filter and install the drainplug kit while the pan was off, then reassemble.
This is a type of kit I was considering, no welding required.
09-08-2010, 01:05 PM #6
B&M makes a drain pan plug kit. Had one in my '96 suburban before I went to a deep aluminum pan with plug.
01-26-2011, 03:38 PM #7
this drain plug was installed with permenent lock tight. the pan will require removal then heat the drain plug until it glows [use goggles] then using a 6pt socket 1/2inch drive slowly increase torque till the plug breaks free. my plug blew out the lock tight like a mini explosion..
having this drain plug helps remove the fluid to make this an easier job. or even to help lower fluid level,,,,.
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