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My apologies if this is already answered, but I could not find it.
I want to put a Fumoto quick-drain valve on my trans to make future flushes and final fluid adjustment easier. I can't for the life of me find what the thread pattern is so that I can check if Fumoto offers a valve that fits. I don't want to pull the plug to check with my thread gauge as I don't want to deal with the mess until I have the Fumoto in hand to put back!
I have the F-111N on it for the engine oil and it's great!
Did you check the Fumoto web site for the fitment. Here is there 800 number. (800) 918-3406
The only info I could find was for engines. You may want to know what size and
thread the current drain has so you can tell them when you call.
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I called Fumoto, but they said they don't keep a compilation of all the specs for transmissions and that the best way if you don't know it is to remove and measure the thread pitch and DIA yourself.
If I don't get a solid answer from the forum soon, I'll just find a time when the truck can be down a couple days, pull it to measure, and order the Fumoto. Was just trying to avoid having the truck down.
Not sure why I didn't think to do this first... I went to RockAuto's website to find a standard replacement plug. It calls out DORMAN 65428 (replaces OEM p/n F81Z6730AA) which has a thread pattern of M10 x 1.50.
Called Fumoto again, they do not make an M10 x 1.50, only M10 x 1.25. Also checked similar product ezoildrainvalve, but same story there.
So, looks like this is not possible unless I want to do some kind of adapter which could be pretty hokey...
Edit: I have to pull the plug anyway to do a minor repair, so I'll confirm that it's really M10 - that sounds pretty small now that I think of it.
Last edited by dsimon42; Aug 8, 2016 at 11:51 AM.
Reason: Added comment about M10 size
To close on this, I physically confirmed the thread pattern of the drain plug in a 4R100 transmission as metric M10 x 1.50. Bummer, as the Fumoto valves make changes soooo much easier, especially on a lifted truck when the wind is blowing crap around!
The minor repair was just the resolution of a leak. I had a new HD 4R100 trans put in, and it's been leaking just a little bit, like a couple drips accumulating at the drain plug overnight. Super annoying but I had been putting off trying to figure it out. Has not been very obvious where it is coming from. Confirmed level not over-full. Checked fill tube insert point, fill tube junction, top of trans, etc. nothing there. Pan bolt? Could be, hard to tell. Checked torque on those. I suspected a more obvious source which is the temp sensor since the shop that did the trans install had to swap the sensor over from the old trans. I also wanted to remove the plug itself to inspect for any burrs or obvious issues there. So, plug had to come out (that's where I thought I had a great opportunity to put a Fumoto back in its place).
While it was out, I could take my time on removing the sensor and Teflon-taping it (shop did not put any on). It also did seem somewhat loose so I seated it back in there snugger.
Hoping that that took care of it. Will give it a few days and check.
Update: She's been clean as a whistle the last week. Previously, it would have already re-collected drips at the drain plug, so I am considering the leak resolved.
