C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

700r4 Leak

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Old Jan 19, 2025 | 11:53 AM
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Default 700r4 Leak

Here is the leak I am fighting. It looks like the bottom two trans pump bolts are leaking. I found about a half qt of atf in my tray under the car. I'm thinking the trans pan is leaking too as the gasket looks pushed out. A buddy called his trans guy who said to use the fiber style trans pan gasket. I'm wondering how much will leak from just the pump bolts? I bet it's filling the inspection pan then draining out the hole. The input seals looks dry and no atf being slung around. I think those pump bolts are pretty long and I'd need to pull the trans to replace the bolt seals?

Fill tube, lines, and tv all are dry.

The drip below was after cleaning off and running the car for a few minutes. Drip happened after about a min or two of shutting off. The trans wasnt up to full temp and its winter and don't want to drive it in the snow.




Last edited by Kjdad; Jan 19, 2025 at 12:21 PM.
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Old Jan 19, 2025 | 11:12 PM
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The pump bolts are about 2-1/2" long. You're right, they can't be removed with the transmission installed.

Have you tried tightening the ones you can reach with a box end wrench? You might get lucky.
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Old Jan 21, 2025 | 05:24 PM
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^^^^ Good idea.^^^^

I was also thinking to back them out a few turns and try to schmear a little sealant under the bolt heads and snug them back up.
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