Leakage by transmission pan & housing sensor

Was replacing a couple of o2 sensors today and I noticed I’ve got some leakage going on by the transmission oil pan & the drive shaft actuator. Curious as to what you guys think. New gasket needed? Why leakage showing by actuator as well? Looking for some input, thanks.

 

Bump..

 

Gotta bump this mid to late morning, or early afternoon, when there are people on here to see it. Good luck!

 

Maybe start by cleaning it up really good and then give it another day or two to narrow down the point of origin. I've not seen anyone else report a leak here. I've only seen the T case seal leak before.

 

Now a good time?

I’ll end up doing that this weekend. Just interesting how it’s leaking in both places, that wasn’t the case a couple weeks ago. Has to be correlated.

 

It’s late afternoon on the west coast. But a lot of people aren’t working anyway so maybe.

Depends on whether you get the response though need.

 

I’d say clean it, one might be blowback from driving, might only be one leak

 

Have you determined if it's oil, ATF, or transfer case fluid?

 

Confirmed that I have minor seeping from my transmission pan, probably the gasket which should be relatively simple.

Any idea how/why this is leaking? Buddy said O-Ring gasket

 

So you've got 2 different leaks then? If you're gonna drop the transmission pan you might as well clean that filter out. Last year people were discussing replacing the shift solenoids while the pan was off. You may want to see if that's worth doing.

@empty_lord what are your thoughts on those 2 leaks? He's not getting many responses here.

 

Hmm. Don’t see em leak there ever on the output.. to me I’d try the simple cheap fix first before tearing the t case apart, replace the seal on the sensor right on the tail shaft. (I think it’s an o ring). The output seal looks dry where the drive shaft goes. As for the pan, that ones not too uncommon, sometimes the dipstick seal leaks too (if the stick is wet halfway up where the upper tube meets the pan tube) Clean really well after you do that and make sure the seal between the t case and trans isn’t leaking

 

Appreciate that bud. So drive shaft sensor O-ring seal? As far as the transmission, I believe that’s just gasket. Dipstick is only wet by the measuring tip.

 

Yea that sensor should have an o ring. It would be the cheapest fix. Pull it out and pull the o ring and find one that fits (I don’t think Toyota will sell you the gasket without the sensor)

 

That’s is our culprit. So just some info; that sensor is just those phillips heads, bolt, unplug and I should find an O ring seal? How much tranny fluid should I expect to lose? Not much I’m assuming.

 

I don’t believe you’ll lose much. Just check the level after. Shouldn’t be much of any. Minimize loss by jacking the back of the truck up.


Harbor freight sells an O ring set for cheap that may have the one you need

 

Toyota just might sell just the o-ring, they do for the rear ABS sensor. I had to get one from them for mine as I tried numerous generic kits and couldn't find one to fit properly. You might run into the same problem.

 

I didn’t see one listed, but knowing Toyota it may be hidden in some obscure list

 

@Roman might know the part number if it exists.

 

@empty_lord @PCJ
Went to Toyota today, supposedly it is called the speedometer o-ring, part # 96711-24030. Parts lady got me one for $3 bucks, gets here first thing Saturday. Also inquired about transmission pan gasket, according to them it doesn’t use a gasket rather FIPG (

$35 00295-01281 Formed-in-Place Transmission Gasket - 3.5 oz. Tube

00295-01281), which you shape around the pan lining. Generic version is called Permatex, any real difference?

 

The Toyota orange fipg works well permatex will work too.

 

Okay, question ahead... Today and yesterday has been some love to my Tundra. Replaced rear axle seal (leak), cleaned throttle body and currently doing the transmission pan seal (FIPG). I also replaced the “speedometer” O-ring seal as above shows some leakage by the rear driveshaft/housing. I did lose a slight bit of fluid popping her out. I’m just making sure that this yellow/gold fluid was indeed diff fluid correct? See below... also any tips for removing diff checker/filler plug? Using a 24mm and torque wrench, shit won’t budge.

 

That’s going to have gear oil since it’s on the transfer case.


The plugs can be tight.. I use a breaker bar to loosen them if they’re stubborn. But usually it’ll come loose with a whack of the hand and a ratchet

 

ALSO.. no wonder pan was leaking, idiot before me put some seal on here when it was supposed to be an adhesive.. also this fluid is very red, I plan on reusing it. Been careful with it, sound fair?

 

It’s pretty red. Up to you really. Now is the perfect time to change it though


That cork seal can work... but it has to be torqued just right or it cracks then leaks. Orange fipg and your set.

 

Personally I never reuse fluid. It's inexpensive insurance. Also, you never want to use a torque wrench as a breaker bar. It will throw the calibration off.

And if your rear axle seal is leaking it is a good idea to change the bearing at the same time. Gear oil will ruin the bearing. And check your axle vent and make sure it's not clogged if you haven't done so. One of the main causes of seal leakage.

 

Gotcha, I got Mobile 1 Synthetic 75w90, just to be clear this fill is back into the diff correct?

Appreciate the suggestion. I might just go ahead and dump the fluid tbh, I already had bought 5 qts of Toyota AT IV fluid. I keep hearing 4 quarts & 5 quarts to replace, but it seems combining the leftover in the pan and in my recycle pan, I’ve got slightly over 5 quarts which came out.

 

hmm? t case and diff are different. technically the transfer case takes straight 80. but i run

$39 75w-90 GL-5 Limited Slip, Ultra Long Drain 500k Miles, Manual Transmission, Gear/Differential Lubricant (1 Gallon)

75w-90 as well as a million others for the transfercase with no ill effects other than being WAY easier to find


your rear diff if not LSD will be fine with 75w90. if you have an LSD rear diff i recommend lucas oil 75w-90 dino. synthetic in the LSD diffs causes horrible chatter

 

@empty_lord Unfortunately no LSD, but at least I don’t have to go swap out this gear oil now lol also can I check transfer case fluid level similar to a diff?

 

yup. pull the fill plug and it should be level with the hole or trickle out.