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Old 09-08-2006, 01:03 AM
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4L60E leak

OK, I did the search but didn't find any information about the leak I have, but did learn to say that the tailshaft housing bolts to my tranny using 6 bolts.
To make a long story short, I have a fluid leak on my 2002 Silverado that is coming from the bolt that is in the 10 o'clock position, viewed from the back of the trans. It must be coming from a pressurized fluid passage, due to the volume of fluid that is coming out and the position of the bolt would rule out a gravity fed leak. This all started at about 40K miles when the weather cooled off, so I blamed the seal between the tailshaft housing and tranny body. Tried tightening the bolts. Didn't work.
I finally broke down and replaced the seal, using just a little silicone. It didn't help. In fact, the leak worsened, so I put it on ramps and let it idle in gear while watching. Sure enough, fluid was pouring out around the threads of the bolt.
Could I have a cracked case or a porosity that is tapping into a fluid passage? If either of these is the case, what can I do, besides buy a drip pan? LOL

Thanks in advance.
Grogetter
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Old 09-08-2006, 06:35 AM
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is it a 4x4? its quite possible that the case is cracked/broken. the low reverse clutches r at the back of the case, and its quite possible the majority of the leak is coming from pressure from that circuit. get it checked out by a trans shop with a good reputation.. not just 1 with a corporate name.
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Old 09-08-2006, 03:13 PM
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Thanks tnsmith

It's a 2wd extended cab and hasn't seen any offroad except the interstate shoulder a couple of times (we call it a Texas Exit, when the traffic is stopped on the main lanes)
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Old 09-08-2006, 07:07 PM
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does the stick still read full? if u got it hot, say maybe climbing a long hill, theres a good chance that its venting fluid. does it have an auxiliary cooler?
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Old 09-08-2006, 07:37 PM
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Not that simple.

I sure wish it was that simple, but if I start out with the pan at the proper hot level, it goes down over time. If it was coming out of the vent, the trail down the underside of the truck and the puddle in my driveway would be in a different place. I think it came from the General with an aux cooler. Before I determined that the fluid was coming out of the bolt threads, I cleaned everything really well, so I had a great view with no doubt where it was coming from.
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Old 09-08-2006, 08:45 PM
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if you have tranny oil coming out from around the bolt head on the tail housing....... you have a crack. if the square cut O-ring was replaced as you state.


the late model 3 piece case 4L60E have a small hole in the back of the MAIN case to spray the area with tranny fluid for lube
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Last edited by Crosley; 09-09-2006 at 11:22 AM. Reason: goof'd on typping
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Old 09-08-2006, 08:47 PM
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That's a real stumper as I beleive the hole that the bolt you describe threads into is an open tap hole and there aren't any fluid passages near it.
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Old 09-09-2006, 12:43 AM
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Stumper

That's correct. The tailshaft housing flange is clearance drilled and the flange on the case is threaded through. That's where the fluid was coming from, around the threads on the bolt at the 10 or maybe 11o'clock postion.
Since it is located higher than the pan and I assume that there is no pressurized fluid in the tailshaft housing, it must be coming from the case side.
Do you think there's any chance that it is coming from some other "clock" position and just finding it's way out at that particular bolt?
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Old 09-09-2006, 04:44 PM
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listen to crosley, he knows what hes talking about...
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Old 09-11-2006, 11:06 AM
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Good advice!!

Thanks crosley and tnsmith. I couldn't agree more, having read some other posts by crosley.
Again, thanks to all.
Grogetter
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