I have a TH350 that leaks where the speedo gear goes into the side of the trans. I've replaced the o-ring in there with no luck.

I park the car and a week later I have a nice puddle of trans fluid under the car. Looking up at the trans points to the speedo gear area where the fluid is coming out.

How else can I get this thing to stop leaking all over the ground?

There are 2 o-rings in the speedo gear housing. An outer and an inner. If you only replaced the outer take the housing out again , remove the gear and get at the inner o-ring. It seals the interface between the speedo gear itself and its housing. Its a very small o-ring.

Yep 2 orings. The one that leakes is the small one rthat goes over the plastic speedo drive gear. Easy to miss it.

Wow, thanks guys. I didn't even know there was supposed to be a 2nd o-ring. :clonk:

Is there even a groove on the speedo gear for it? I don't recall of ever seeing one.

Thanks again.

the plastic driven speed-o gear stem should NOT be grooved.

It should be smooth where the rubber seal rides and not real loose in the speed-O bullet housing

Sometimes the housing wears out and helps the fluid leak by

The seal isn't an o-ring per se, it looks like a tiny all rubber timing cover seal held in with a little c clip(Sorry, best description I could come up with). In many older housings there's often room to double up the seal.

Any pics?

My freind you are making this way too hard. On monday go to your local GM dealer ( Pretty much any GM dealer will do ) and tell him that you need BOTH o-rings for that speedo housing. You'll probably spend under 10 bucks. When you see the seals you'll understand.

IF you look at the smaller of the 2 seals AND it looks like there is an edge to it like the rear main seal on your crankshaft THAT edge (or lip) points to the INSIDE of the speedo housing. As in points to the inside of the transmission when installed correctly. Take something sharp like a dental pick and after you remove the speedo gear from the housing take the pick and pop the little rubber seal out of its groove inside the speedo bullet. Replace the old seal with the new seal and reassemble the whole unit.

Its been a long while since I saw one of those little seals and I don't recall if its a lip seal or just a square cut seal.

Good luck :)

My freind you are making this too hard. On monday go to your local GM dealer ( Pretty much any GM dealer will do ) and tell him that you need BOTH o-rings for that speedo housing. You'll probably spend under 10 bucks. When you see the seals you'll understand.

IF you look at the smaller of the 2 seals AND it looks like there is an edge to it like the rear main seal on your crankshaft THAT edge (or lip) points to the INSIDE of the speedo housing. As in points to the inside of the transmission when installed correctly. Its been a long while since I saw one of those little seals and I don't recall if its a lip seal or just a square cut seal.

Good luck :)

Duh, I thought you wanted pics of that car til I figgered out that was your sig! Nope, no pics. It's not rocket science. Unscrew the speedo cable and look at the adaptor. The seal is in the housing right there around the shaft. You don't even "have" to pull the adaptor out of the trans to replace it.
Charbilly, you recall correctly, it's a lip seal.

I guess if me kindly asking for pics (seeing that I learn better from visual aids) is "making it way too hard" i don't know what to say to you......

thanks anyways

You can go to your local tranny shop and order a new bullett. It will come with new seals in it and you can keep the old one for a spare. Last year I replaced the seals in mine and it still leaked. I popped a new one in and it's been fine.

I guess if me kindly asking for pics (seeing that I learn better from visual aids) is "making it way too hard" i don't know what to say to you......

thanks anyways
I wasn't trying to be cruel. I was just trying to say that its very easy to do this job. Its really not complicated. JimChevy has the right idea. I agree. the whole assembly is pretty cheap. In fact I replaced mine for the same reason. I have a bud at the local chevy dealer and I was shopping for seals and he told me the price of the whole bullet. I bought that. Why mess with the seals at all. :)

Absolutely NO insult intended Dawg!