Transmission Fluid Leak
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cougswan
- New Member
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- Joined: Thu Aug 29, 2013 10:15 pm
Transmission Fluid Leak
I drove my truck 350 miles a few months ago and now it has been sitting in the garage for the last two months. I have noticed a transmission leak which is outlined in the attached photos. Anybody experienced this before? Do I just need a new gasket?
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1970 Ford F250 390
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bluef250
- Blue Oval Fanatic
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- Location: Arizona
Re: Transmission Fluid Leak
A couple things. First, can you live with the leak?
Seocnd, you have to find the leak.
Examine the transmission pan gasket or consider that pan is cracked. Either way, pull the cover and replace the gasket. Does the transmission shift as it should? If not look for debris in tranny fluild. Also, you may have a cracked case. Also, depending upon the location of the leak (I cannot tell from the photo) a seal on the shifter shaft, input shaft, or output shaft should be considered.
Good luck.
Seocnd, you have to find the leak.
Examine the transmission pan gasket or consider that pan is cracked. Either way, pull the cover and replace the gasket. Does the transmission shift as it should? If not look for debris in tranny fluild. Also, you may have a cracked case. Also, depending upon the location of the leak (I cannot tell from the photo) a seal on the shifter shaft, input shaft, or output shaft should be considered.
Good luck.
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zgerbic
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- Joined: Sat Jun 27, 2020 12:37 am
Re: Transmission Fluid Leak
I would start with a new pan gasket, but feel around above the pan for any other leakage coming down to the pan.
An important thing to do while the pan is off, besides looking for trash and fluid color, is to make sure the area around the bolt holes is flat. These areas often get bent up due to over-tightening the bolts. Once bent you have to tighten them harder to stop leaks and reach the point where even the gasket will not stop the leaking. Make sure the entire surface around the pan is flat and not warped. Then just tighten them to about 9 to 10 foot pounds, similar to a valve cover or engine pan. It is not real tight as the gasket is there to stop any leaks. After the trans has been hot a couple of times, check the tightness of the bolts and leave it alone.
An important thing to do while the pan is off, besides looking for trash and fluid color, is to make sure the area around the bolt holes is flat. These areas often get bent up due to over-tightening the bolts. Once bent you have to tighten them harder to stop leaks and reach the point where even the gasket will not stop the leaking. Make sure the entire surface around the pan is flat and not warped. Then just tighten them to about 9 to 10 foot pounds, similar to a valve cover or engine pan. It is not real tight as the gasket is there to stop any leaks. After the trans has been hot a couple of times, check the tightness of the bolts and leave it alone.