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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.

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Old 11-21-2017, 07:25 PM   #1 (permalink)
LordImpala
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4l80e transfer case leak

Hey Guys,
I recently lost reverse. It started by having a tire rub noise when reversing and turning backwards out of my driveway. It would also whop whop for a bit after that moving in forward. I thought I had two problems. Possibly the reverse servo pin, and the noise sounded like it was coming from the front tires rubbing/wheel bearing break noise. I ordered the servo pin kit, and was about to install. I noticed a leak that I thought was from a leaky freeze plug was really transmission fluid. Then, I noticed a bolt chillin on the transmission sub-frame. Both bolts that connect the transmission support mount had fallen out. The leak is coming from between the transmission and transfer case. I topped off transmission fluid and gained back reverse which was always kindof weak. Anything else I should look out for besides a new seal?

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Old 11-21-2017, 07:28 PM   #2 (permalink)
LordImpala
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here are some pics.

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Old 11-21-2017, 07:39 PM   #3 (permalink)
1967KaiserM715
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You might want to reseal that adapter, and check it for cracks. Also check transfer case for fluid and tail housing for cracks.

It's an o ring on transmission side, but you could just smear a little rtv around it.

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Old 11-24-2017, 04:24 PM   #4 (permalink)
LordImpala
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Quote:
Originally Posted by 1967KaiserM715 View Post
You might want to reseal that adapter, and check it for cracks. Also check transfer case for fluid and tail housing for cracks.

It's an o ring on transmission side, but you could just smear a little rtv around it.

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hey 1967kaiserm715,

I think I lucked out. The leak looks to be from the transmission pan. I'll replace gasket, and put on the servo extender while the pan is off. The transmission mount is also shot.
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Old 11-24-2017, 04:56 PM   #5 (permalink)
1967KaiserM715
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I highly recommend the reusable gasket, it's plastic with a silicone ring on both sides, and steel inserts around every bolt hole. Dang near impossible to overtorque, which is typically the cause of 90% of the leaks.

If you dont, at the very least peen the bolt holes out (to bottom of pan) to reduce gasket swelling and leakage.

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Old 11-24-2017, 05:10 PM   #6 (permalink)
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Quote:
Originally Posted by 1967KaiserM715 View Post
I highly recommend the reusable gasket, it's plastic with a silicone ring on both sides, and steel inserts around every bolt hole. Dang near impossible to overtorque, which is typically the cause of 90% of the leaks.

If you dont, at the very least peen the bolt holes out (to bottom of pan) to reduce gasket swelling and leakage.

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Thanks. I'll peen the pan. It was probably my fault on the leak. I didn't use a bolt pattern diagram.
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Old 11-24-2017, 08:11 PM   #7 (permalink)
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I found what looked like pieces to a metal washer in the servo pin cup and the interior spring. Ended up deciding to weld about 1 mm to the pin. My reverse was weak, and it would buck if I gave it any pedal. I gave about 4 blows with a rubber mallet to the ball peen hammer to the pan. Taking a break for today before frustration sets in. Installed the servo assembly and forgot the spring.
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Old 03-30-2018, 09:02 PM   #8 (permalink)
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Hey Guys,

I had my truck down saving for a transmission rebuild. I found out what that whoop whoop noise was. My harmonic balancer was toast. I think my crank is still ok. The motor turns over and everything. My shop is going to replace for $300 bucks. Dodged a bullet. Could have been out a tranny and new motor. I've had a lot of good bad luck lately. lol


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Old 04-06-2018, 07:59 PM   #9 (permalink)
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Update: My shop has had my truck for almost 3 weeks. They didn't check the servo pin length after I told them that I had welded on a bit to try to fix reverse. It jacked up 1st gear clutch after the rebuild. They pulled the tranny and replaced it. Today. It reverses fine. Now the forward gears have a loss in power. The shop had it towed to the tranny guys place. Any thoughts?
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