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Old 06-19-2005, 08:21 PM
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Please Help, Problem with TH350

Hi guys my dad and I are currently restoring a 66 Chevy II SS. My dad has rebuilt the 350 trans and we have a weird problem with it. When the car is up on jackstands the trans does not leak a drop through all gears, but when the car is on the ground it wants to force fluid out the dipstick tube. My dad has checked the vents and they seem to be open. Please let me know what you think could be causing this problem. Thanks and take care

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Old 06-19-2005, 09:06 PM
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If you are restoring the car , it did not come from GM with a t-350 tranny. I am not sure how you are restoring the car, so I mention that.

next, You mention checking the vents. There is only one vent on the t-350 tranny. Near the top of the main case where it starts to curve up to form the bell hosuing area over the converter. It is just off center to the passenger side

Regarding the on & off the ground checks........ Do you mean that you are driving the car when off the stands or sitting and idling? The tranny will get warmer during actual driving than on jack stands.

Do you have a extra/add-on tranny cooler on it? Trans cooler in the radiator only?

Do you have a higher stall speed converter?




Quote:
Originally Posted by kehi66
Hi guys my dad and I are currently restoring a 66 Chevy II SS. My dad has rebuilt the 350 trans and we have a weird problem with it. When the car is up on jackstands the trans does not leak a drop through all gears, but when the car is on the ground it wants to force fluid out the dipstick tube. My dad has checked the vents and they seem to be open. Please let me know what you think could be causing this problem. Thanks and take care
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Old 06-20-2005, 07:45 AM
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Yes, I am driving the car on the ground. The car has the trans cooler in radiator only. I have a slight stall converter in it, not sure of rpm but it is mild. Thanks
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Old 06-20-2005, 01:34 PM
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fluid

In my own personal experience the only thing i have seen push fluid back out the top of the tube is way over filling, or a blocked vent.... I am not saying there are not other causes but it's just what i have seen....

You said he checked the vent... How did he do that????? As far as i know the th-350 is the only trans where you can get the pump to case gasket in backwards and everything in the trans will work but it will block the vent tube. Ask me how i know???? I have done it... Everything worked perfect in the trans but it would push fluid out the fill tube.

I would be looking real close at the vent first....

keith
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