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Thread: Project weld a nut to the Transmission pan to add a drain bolt.

  1. #26
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Not being able to drain the oil completely does not bother me. I’ll be able to drain it low enough that when I or who ever else might own it won’t have a hard time and it’ll make it so you don’t make a big mess any time pulling the pan for filter changes.
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  3. #27
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by N2 Welding View Post
    Thanks and yeah it figures HF would be cheaper. Iíll ask while Iím at Napa getting the 5 gallon bucket of transmission fluid. Shoot I still need a new filter and pan gasket.

    I had planned on just reusing the fluid that was drained out. That is why I cleaned the oil pan prior to drilling the drain hole. I emptied the metal bits from the big green oil drain pan before pulling the drill bit out and letting the oil drain. I still have yet to drain the torque converter to see if it was low on fluid.
    Does your TC have a drain plug on it?? a lot of converters don't so the only way to drain em' is the old fashioned way

  4. #28
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Yes the bell housing has a big removable rubber plug and I’ve been reading up on the subject over at FSB forum.
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  5. #29
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    I'd weld the nut on the outside and hold it in place for welding with the bolt from the inside. Use a flat washer under the bolt to act as a heatsink if you're worried about burning thru but if you focus the bead toward the nut and let it "wash" down to the pan you should be OK. If it should burn thru to the washer just tack it in place in a few spots on the inside and leave it in place. I'd also use a little anti-sieze on the bolt to avoid thread galling as the nut will shrink from welding. And don't forget to grind any plating off the nut (and washer if you plan to tack it in place).
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  7. #30
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Thank you Duane.
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    id find a old/used pan of the same beforehand, and do what you want w/ it. that way if things dont work out, your not in a bind

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  10. #32
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Worse case Scenario I have to buy and wait for a new pan that has the drain plug pre manufactured into it to arrive. This is not a daily driver so no hurry but not interested in stretching this project out any longer than necessary. I am interested in learning from this as well as trying to save some money at the same time.
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  12. #33
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    I did quite a few back when I owned an automotive machine shop.

    My preferred method was to use a standard oil drain bolt with a half-thickness nut on the inside. These bolts are designed to seal on the pan - some with and some without a washer.

    You need to check to make sure that there is adequate clearance where you put the drain. Usually in a front or rear corner away from the transmission filter.

    All of mine had the nuts brazed in place on the inside. My reasoning was that this was the factor's preferred method, and a nut welded to the outside is an opportunity for a leak. With the nut on the inside the only leak potential was from the bolt flange. The hole would be sized about 1/8" larger than the threads.
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  14. #34
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    I was just noticing the picture of your pan & thinking that it looks like a 4R100 Ford Trans, I used to replace the pans on the Ambulances with a pan from a 4X4 F350, it had a couple of quarts additional capacity & had a drain plug plus a magnet, at the time I think they were about 60 bucks.
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  16. #35
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by N2 Welding View Post
    Thanks and yeah it figures HF would be cheaper. Iíll ask while Iím at Napa getting the 5 gallon bucket of transmission fluid. Shoot I still need a new filter and pan gasket.

    I had planned on just reusing the fluid that was drained out. That is why I cleaned the oil pan prior to drilling the drain hole. I emptied the metal bits from the big green oil drain pan before pulling the drill bit out and letting the oil drain. I still have yet to drain the torque converter to see if it was low on fluid.
    Here's one of the older style HF copper washer kits from a few years ago... found it down in one of the shop bays while looking for something else earlier
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  18. #36
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by CAVEMANN View Post
    I was just noticing the picture of your pan & thinking that it looks like a 4R100 Ford Trans, I used to replace the pans on the Ambulances with a pan from a 4X4 F350, it had a couple of quarts additional capacity & had a drain plug plus a magnet, at the time I think they were about 60 bucks.
    It's one or the other. Same filter and gasket. I just got the filter and gasket kit at napa when getting the 5 gallons of Mercon oil.

    Thanks ronsii I forgot all about those washers when I was getting the stepped drill bit for $5 and some change after 20% coupon. I ended up using a Toyota Camry engine oil drain plug crush washer that's lined with felt on both sides. I had to gently message the opening about 1/16" with a rat tail file to get it to fit over the 1/2" - 20 bolt. Looks good so far. I think it'll do the job. I'm letting the pan sit full of water at the moment to see if it decides to start leaking. Thinking I should use some RTV on the outside just as an extra measure of assurance that it wont leak on me later on down the road once things get hot from towing the bass boat.


    Last edited by N2 Welding; 09-26-2020 at 10:46 PM.
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  20. #37
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    More pictures of my ugly welds because every one loves weld porn. Oh pan was thicker "16ga" than I thought it would be. I set the machine for 16ga and practiced on 18ga as it was the closed thing I had to practice on.

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  22. #38
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Leak test? I have found more weld doesn't necessarily make leak proof, especially with mig and stick. Just sharing from personal experience.

  23. #39
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by tapwelder View Post
    Leak test? I have found more weld doesn't necessarily make leak proof, especially with mig and stick. Just sharing from personal experience.

    At this point I'd take a little leak from the drain plug over the leak I got when filling it up. Damn Napa Must have gave me the wrong Gasket or I pinched it some how putting it on. Tons of oil all over my driveway. PO'd is an understatement on what I'm feeling right now about the oil all over the place and wasted money on the oil.
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  25. #40
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by N2 Welding View Post
    At this point I'd take a little leak from the drain plug over the leak I got when filling it up. Damn Napa Must have gave me the wrong Gasket or I pinched it some how putting it on. Tons of oil all over my driveway. PO'd is an understatement on what I'm feeling right now about the oil all over the place and wasted money on the oil.
    Did they give you a black rubber gasket with metal inserts on the holes??? most of the factory E4Od's and 4R100's CANNOT use this reuseable gasket!!!! because the pans have flanged holes and will only work with the stock CORK style gasket...

    I have done a *lot* of work on E4OD's


    Oh... and since you mentioned earlier you're changing the filter... make SURE you pull the old rubber seal out of the transmission body BEFORE you try to install the new filter!!!!
    Last edited by ronsii; 09-27-2020 at 01:54 AM. Reason: typo's :)

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  27. #41
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by ronsii View Post
    Did they give you a black rubber gasket with metal inserts on the holes??? most of the factory E4Od's and 4R100's CANNOT use this reuseable gasket!!!! because the pans have flanged holes and will only work with the stock CORK style gasket...

    I have done a *lot* of work on E4OD's


    Oh... and since you mentioned earlier you're changing the filter... make SURE you pull the old rubber seal out of the transmission body BEFORE you try to install the new filter!!!!
    All of my Ford Ambos had 4R100 trannys and they all came from the factory with with the reusable rubber gasket & I had collected a shload of cork gaskets by the time I retired.
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  29. #42
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by CAVEMANN View Post
    All of my Ford Ambos had 4R100 trannys and they all came from the factory with with the reusable rubber gasket & I had collected a shload of cork gaskets by the time I retired.
    A lot of the later ones came that way... and I guess I should mention it works similar in reverse if you use a cork gasket with a non-flanged pan(flat holed pan) it is really easy to overtighten the bolts and distort(bend) the pan permanently! and it 'can' leak... but it is more common for people to get a rubber gasket from the parts store and install it on a pan that has the punched holes.. where the punching acts as the limiter to not over crush the cork gasket.. but when the rubber gasket has it's own spacers it holds the pan away from the tranny too much and you get instant massive(after you put in about 5 quarts) leakage

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  31. #43
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Yeah the gasket I pulled off was black rubber. Thinking I need to find a new black reusable gasket. The one that was on the pan had some type of glue or something holding it in place at a couple of corners.
    Last edited by N2 Welding; 09-27-2020 at 02:39 AM.
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by ronsii View Post
    Did they give you a black rubber gasket with metal inserts on the holes??? most of the factory E4Od's and 4R100's CANNOT use this reuseable gasket!!!! because the pans have flanged holes and will only work with the stock CORK style gasket...

    I have done a *lot* of work on E4OD's


    Oh... and since you mentioned earlier you're changing the filter... make SURE you pull the old rubber seal out of the transmission body BEFORE you try to install the new filter!!!!
    Yeas they gave me the skinny black rubber ribbed gasket with what feels like a metal liner on the inside. It looked like a good fit but I probably should have put my glasses on. Slaps forehead. ARG...

    Oh and Yes when I pulled the old filter out the oil seal was still attached to the filter. I read about that one too.
    Last edited by N2 Welding; 09-27-2020 at 02:40 AM.
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  33. #45
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    I'd reuse the old black flat rubber gasket that came off the pan when I pulled it but I'm not confident it will go back on with out leaking :/

    Does any one "rosii" know of the part number for the same gasket I need at say Oriley's, AutoZone or Pep Boys? Oriley's has a warehouse in my city so if they have it preferably I'd get it from them.
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by N2 Welding View Post
    Yeas they gave me the skinny black rubber ribbed gasket with what feels like a metal liner on the inside. It looked like a good fit but I probably should have put my glasses on. Slaps forehead. ARG...

    Oh and Yes when I pulled the old filter out the oil seal was still attached to the filter. I read about that one too.
    Could be your pan was bent??? maybe from a previous removal and someone tried to put the wrong type on??? I can't remember it's been a few years since the last E4OD pan pulling I have done but I seem to remember there were black rubber gaskets that worked with the punched pans... I think??? Do you remember if your pan had nice flat holes where the bolts go or did it have the punched ones with about and 1/8th inch dimple sticking up towards the transmission? if it has the dimples then you must make sure the pan gasket sits around them... I'll try to find some pics but I think they're on an old computer that is out to lunch right now

  35. #47
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Punched dimpled pan as seen in the video linked above.
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  36. #48
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Oh!!!!!

    One other thing I should mention... and you may have already read about it it is VERY easy to strip the bolts the hold the pan on!!!! so you'll need a heliciol set and a bunch of coil refils and the pan will leak if you can't tighten them to spec!!!

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  38. #49
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Yes I recall reading something like 15-16 ft lb of torque but when I saw the leak I panicked and started tightening them even more even though I torqued them to spec. :/

    Here is a Felpro Composit Gasket I'm looking at getting in the morning.

    This time I'll bring the trans oil pan with me to make sure the gasket fits correctly. What sux is the money I wasted on that gasket. Napa Probably won't take it back for a refund now that it's been used.

    https://www.autozone.com/drivetrain/transmission-pan-gasket-a-t/fel-pro-transmission-pan-gasket-a-t-tos18714/323949_342880_26641
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    Re: Project weld a nut to the Transmission pan to add a drain bolt.

    Quote Originally Posted by N2 Welding View Post
    I'd reuse the old black flat rubber gasket that came off the pan when I pulled it but I'm not confident it will go back on with out leaking :/

    Does any one "rosii" know of the part number for the same gasket I need at say Oriley's, AutoZone or Pep Boys? Oriley's has a warehouse in my city so if they have it preferably I'd get it from them.
    Sorry, don't remember the part numbers.. but I do still have a few 'rebuild kits' for E4OD's/4R100's laying around here somewhere and they should have pan gaskets with them... not sure which one.. or if they'll have bagged with numbers or not but I'll look in the morning.

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