Hard to say…Something is causing an overpressure condition at higher rpm/road speed. Have you contacted the shop/builder about the issue? If so, what did he say?
I'm about done...
- Thread starter davidbeaver1
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davidbeaver1
Member
I did contact him and he said he didn't do anything wrong. I wouldn't take it back to him anyway, he broke a manifold stud when he was replacing the exhaust, didn't tell me and I had an exhaust leak. He then tried to cover it up saying it was already broken, then said it was cheap metal, that's why it was broken. My mechanic was blown away by the way he left the vehicle when he was finished.
The manifold stud can be closed using clamps that you can find at RA that are made by Dorman and SKP, unless of course it is already fixed.
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davidbeaver1
Member
Yep it's already fixed and all buttoned up. All that's left is to figure out it why it's pushing fluid out...
That sucks, guy shouldn’t be working on anyone’s vehicle or parts for any reason.
Have you checked your transmission fluid level after driving? Just a wild guess but wondering if trans fluid is leaking into the tcase causing it to belch some out the vent but looks normal once you check it afterwards. Again, wild ass guess to be honest…
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davidbeaver1
Member
I haven't but I will check it tomorrow. I didn't know the transmission and transfer case swapped fluid...
They are not supposed to.
They’re not supposed to but it can happen if the rear seal in the trans is leaking.
Mudsport96
Full Access Member
Had that happen to me on both my 96 and 97 S-Blazers.
The 6L series transmissions and 4L80e have a rear case seal however the 4L60e/700r4s don’t, interestingly enough. The 4l60e and 700r4 rear output is mostly sealed off via the rear case bushing (a sealing bushing as opposed to a lubrication bushing) and rear planetary ring gear hub’s journal but excessive fluid can leak past and into the extension housing/trans-tcase adapter if that bushing is excessively worn. The extension housing/adapter takes a square cut rubber seal on the perimeter and there is a seal on the t-case side that prevents fluid transfer but if it’s also worn, transfer can occur. That bushing, along with all the others should have been replaced when the transmission was rebuilt (not saying it was or wasn’t, have no idea in this particular case)
6l80e
4l80e
4L60e (bushing removed, new bushing not yet installed)
Interesting. I have never rebuilt a trans but assumed there was a rear seal on a 4l60. I do know there have been members here who kept losing trans fluid and gaining transfer case fluid. Never have heard of it coming out the tc vent tube but I have heard of it coming out the trans vent tube due to overfilling.
Mudsport96
Full Access Member
It gets worse on the older models. The front diffs on the S series was vacuum actuated. So after your trans went low and got mushy shifts and tcase over filled there was a possibility that the detent valve would suck fluid by the seal and into your vacuum hose to the ball underhood. Then into your dash vent actuators.... cant tell you how many of those i did at the dealership.
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davidbeaver1
Member
Well, @NickTransmissions and @Rocket Man called it! Checked the transfer case fluid and about 1 quart of oil came out. Mechanic ordered the seal and is going to install it next Tuesday. Wonder why the transmission guy didn't replace it when he performed the rebuild?
