A904 Trans Oil Pan

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340inabbody

340inabbody

FABO Gold Member
FABO Gold Member
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Hi ok so my leaks maybe due to the pan which is a little beat up. So 3 Questions:

1. What pans have you used and liked?
2. What gasket works best?
3. If you used a deeper pan do you have to lower the filter pickup?

Thanks
 
1) most name brand aluminum pans work good. Make sure it has a drain plug and even a tapped port for a gauge sending unit.
My choice is TCI. Good looking and affordable.
2)any 904 gasket is good. No silicon (except to just hold on place. A tiny bit too) just don’t over tighten.
3)deeper pan- lower filter. A good pan comes with that adapter and longer screws. Also replace filter at that point.
Joe
 
340inabbody said:
Hi ok so my leaks maybe due to the pan which is a little beat up. So 3 Questions:

1. What pans have you used and liked?
2. What gasket works best?
3. If you used a deeper pan do you have to lower the filter pickup?

Thanks
Click to expand...
Hughes makes a nice deep pan, and since youre in AZ you can drive over there and pick one up. Moroso makes a nice reusable one, im running one on a 904 and 727.

Jake
 
xLURKxDOGx said:
Hughes makes a nice deep pan, and since youre in AZ you can drive over there and pick one up. Moroso makes a nice reusable one, im running one on a 904 and 727.

Jake
Click to expand...
Are the 727 pans the same as the 904? I didn’t onow Hughes we in AZ. Will look them up.
 
With a deep pan, the full mark is in the same place. I never lower the filter because I want it up away from the bottom where the particles lay. The pan usually has been blocking the bottom of the filter on most of the 904s I see. Deep pans are just hype. If you want a cooler running trans install a larger cooler. Some of my customers want a deep pan so that's the only reason I sell them. Most cars at stock height shouldn't run a deep pan because it becomes the lowest part on the car and it gets damaged easily. I think some people want a deep pan on a leaky trans so they don't have to watch their fluid level; so of course they do need the filter extension.
 
CudaFactHackJob said:
With a deep pan, the full mark is in the same place. I never lower the filter because I want it up away from the bottom where the particles lay. The pan usually has been blocking the bottom of the filter on most of the 904s I see. Deep pans are just hype. If you want a cooler running trans install a larger cooler. Some of my customers want a deep pan so that's the only reason I sell them. Most cars at stock height shouldn't run a deep pan because it becomes the lowest part on the car and it gets damaged easily. I think some people want a deep pan on a leaky trans so they don't have to watch their fluid level; so of course they do need the filter extension.
Click to expand...
Yeah I purchased the Summit deep pan because I wanted a fly cut flat surface to bolt up. Didn’t care if it was more capacity. It looks well made compared to all the stamped steel stuff. So now its a matter of deciding to lower the filter or not. Too bad I no longer have access to a Bridgeport I could of slimed down the extension to half that the thickness which might have been a happy position for the filter...
 
OK I may have two leaks in the trans. The pan might be leaking but for sure I have another leak. It looks like the area over the trans mount is weeping in the corner see arrow B. It may be the cause of what I see on the two eyelets and bolt (A). It also maybe bolt A not sure. What is bolt A? Could it be leaking or is that go through the case into a wet area? FYI my car's rear end is jacked up so flow would go from the back to the front.

transleak2.png
 
Having issues uploading the right image. Here it the one I was refering to.

transleak5.jpg
 
There's a lot of air moving around in a lot of different directions under a car. It's very possible that fluid leaked out of the speedo internal lip seal, or possibly thru the cable housing itself; and blew forward onto the access plug. Sometimes the plastic gear gets a groove worn in it, but you can shim the seal outward or just flip it.
 
CudaFactHackJob said:
There's a lot of air moving around in a lot of different directions under a car. It's very possible that fluid leaked out of the speedo internal lip seal, or possibly thru the cable housing itself; and blew forward onto the access plug. Sometimes the plastic gear gets a groove worn in it, but you can shim the seal outward or just flip it.
Click to expand...
Thanks CFH I am doing the inspections passively wiping own and checking with the car up. I believe my leak is from the tail c clip access plate as the trans mount bolts are wet and also around that seal. This is the highest place I see fluid and everything else is wet due to downwind flow so to speak. Unfortunately the transmount is covering it and I have to pull it along with the cross member possible as well.
 
I see fluid on the outer threads of the speedo. Is there fluid visible inside by the gear stem? Old Car Rule #27 "Always do the easy fix first".
 
CudaFactHackJob said:
I see fluid on the outer threads of the speedo. Is there fluid visible inside by the gear stem? Old Car Rule #27 "Always do the easy fix first".
Click to expand...
Yes! I changed both gaskets with new ones and it was still weeping. So I pulled it and used a bead of RTV around the lip past the oring. This along with changing my C clip tail acces access under the transmission mount. Used RTV there as well. She looks like no more weeping! I am waiting on my MOPAR gasket you guys mentioned. But this pan I got from Summit is dam nice! No stamped POS.

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CudaFactHackJob said:
Both speedometer "gaskets"? One is an o-ring and the other is a lip seal.
Click to expand...
Yup both were replaced as well as a shiny new C-clip. Ok what I think is the new outer O-ring was sloppy as Maryjane Rottoncrach. So I inspected the original and it fit better and was in good shape. The RTV was insurance as I don’t want to do that again. Ever.....
Oh and here is the new pan installed in my B-Body. The headers remain the lowest point of the car other than the wheels :)
Also not my welds I could do better....

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