65 Mustang leaking trans fluid

gandl2123

Member
Apr 2, 2019
48
10
18
59
Augusta, GA
Bought a project and have my hands full. Just replaced the bottom end on my 302 (69) block w 65 289 heads on it. Rear main seal is new. Started and ran for a few mins w no oil leaks at all...but, trans fluid is dripping at a fast pace from the inspection pan area. One or two drips a second from an area 4" long along the bottom center of the inspection cover. Thin softball sized puddle in 60secs.
Any ideas? I'm hoping torque converter plug is lose but thinking front seal in transmission has been compromised. Thoughts? Suggestions? And how difficult or costly to fix? Thanks in advance for any help.
 

Attachments

  • Sponsors(?)


dennis112

15 Year Member
May 15, 2005
1,521
28
79
Amish Wonderland of Central PA.
Since you verified that it is indeed ATF then it is most likely the seal at the front of the transmission that seals the torque converter snout to the transmission. Typically one replaces it when the have the motor out as an insurance policy against leaks. The seal is the small shiny area surrounding the input shaft in this photo:

tranny4.jpg


Unfortunately replacement will require dropping the transmission to remove the torque converter in order to get to the seal that is installed on the transmission. The seal is fairly inexpensive and the work is not too difficult as all you need to do is remove the old seal that surrounds the front transmission shaft and reinstall a new one. If you are mechanically inclined and don't mind the labor, its not a big deal. If you are concerned about whether the new seal is installed correctly it it could be done at a shop in just a few minutes if you cart the transmission to them. You should also know how to "key" the torque converter back on the transmission before reinstalling the transmission. Its easy and the tranny shop can show you how to do it.
 
Last edited:

gandl2123

Member
Apr 2, 2019
48
10
18
59
Augusta, GA
Since you verified that it is indeed ATF then it is most likely the seal at the front of the transmission that seals the torque converter snout to the transmission. Typically one replaces it when the have the motor out as an insurance policy against leaks. The seal is the small shiny area surrounding the input shaft in this photo:

tranny4.jpg


Unfortunately replacement will require dropping the transmission to remove the torque converter in order to get to the seal that is installed on the transmission. The seal is fairly inexpensive and the work is not too difficult as all you need to do is remove the old seal that surrounds the front transmission shaft and reinstall a new one. If you are mechanically inclined and don't mind the labor, its not a big deal. If you are concerned about whether the new seal is installed correctly it it could be done at a shop in just a few minutes if you cart the transmission to them. You should also know how to "key" the torque converter back on the transmission before reinstalling the transmission. Its easy and the tranny shop can show you how to do it.
Yeah, that was what I was fearing. Have done before on other cars but this is my first Mustang. I wonder if it would be possible in the mustang to disconnect what needs to be disconnected and slide her back enough to make the repair. I think I know the unwanted answer but hoping. I really hope I take the inspection pan off and the drain plug is loose. Lol
 

dennis112

15 Year Member
May 15, 2005
1,521
28
79
Amish Wonderland of Central PA.
I suppose that a converter plug could be loose if it has one, but as far as replacing the seal by moving the tranny backwards it isn't going to be the least bit easy. Remember that the converter has to come down before anything else can be done. The tranny can't go back that far without hitting the upper part of the transmission support. Also I don't know if the seal can be put in correctly with so little working room. I'd say that it would be best to plan on dropping it to the ground from the get-go.
 
Last edited:

gandl2123

Member
Apr 2, 2019
48
10
18
59
Augusta, GA
I suppose that a converter plug could be loose if it has one, but as far as replacing the seal by moving the tranny backwards it isn't going to be the least bit easy. Remember that the converter has to come down before anything else can be done. The tranny can't go back that far without hitting the upper part of the transmission support. Also I don't know if the seal can be put in correctly with so little working room. I'd say that it would be best to plan on dropping it to the ground from the get-go.
Yeah, better do it right and not take any short cuts. Argh!
 
Thread starter Similar threads Forum Replies Date
C SN95 Automatic Transmission Pan Leak Around Bolts 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
8 Coolant leak Fox 5.0 Mustang Tech 4
T No power to the MAF Sensor 1996 - 2004 SN95 Mustang -General/Talk- 0
B 1982 Mustang 5.0 oil leak Fox 5.0 Mustang Tech 3
trlps_ 02’ Mustang GT flutter like sound 1996 - 2004 SN95 Mustang -General/Talk- 6
0 02 mustang GT leaking coolant after head gasket job... 1996 - 2004 SN95 Mustang -General/Talk- 1
H 2003 Mustang GT 4.6L Intake Manifold leak SN95 4.6L Mustang Tech 0
P Fuel Fuel Leak after replacing fuel filter SN95 4.6L Mustang Tech 4
03GThoopty Progress Thread 2003 Ford Mustang GT Build Log 1996 - 2004 SN95 Mustang -General/Talk- 98
mpeach1976 2014 Mustang GT with leaking fuel line 2010 - 2014 Specific Tech 1
jackson0215 Possible Vacuum Leak 67 Mustang Classic Mustang Specific Tech 2
L Engine Rough Idle at Start, Possible CMCV Vacuum Leak 2015+ Specific Tech 0
F Proud 2kGT Owner Looking for Info The Welcome Wagon 1
K Coolant Leak 1996 - 2004 SN95 Mustang -General/Talk- 1
9 1997 mustang gt o2 sensor vaccum leak and idle problem SN95 4.6L Mustang Tech 2
mpeach1976 Engine 2014 mustang GT...coolant smell, no sign of leak. 2010 - 2014 Specific Tech 0
A 2003 mustang gt - Header leak 1996 - 2004 SN95 Mustang -General/Talk- 1
F Convertible top leaks into area behind backseats. (1999 Mustang GT) 1996 - 2004 SN95 Mustang -General/Talk- 5
J Engine 2014 Mustang V6 leaking coolant 2005 - 2014 Specific V6 Tech 2
B 2012 Mustang AC Leak 2005 - 2014 S-197 Mustang -General/Talk- 1
9 Exhaust 92 5.0 gt mustang- emissions/brakes/vaccume leaks/exhaust/CEL Fox 5.0 Mustang Tech 8
S 99 mustang had the gas tank drop out broke strap there where you put the gas in leaks underneath when I put gas in, there are two other hoses near it 1996 - 2004 SN95 Mustang -General/Talk- 0
0 2001 Mustang leak under engine 1996 - 2004 SN95 Mustang -General/Talk- 1
J Engine 92 mustang oil leak Fox 5.0 Mustang Tech 3
dzphantom 2006 Mustang Gt Convertible Leaking At Front Seal. 2005 - 2014 Specific V6 Tech 10
S Possible Intake Manifold Gasket Leak? 2013 Coyote 2010 - 2014 Specific Tech 1
J Engine 1974 Mustang 2.8 Water Leak Nightmare 1974 - 1978 Mustang II Talk & Tech 3
R 1992 Mustang Gt Vortech V1 Install = Lower Intake Oil Leak. Help! Fox 5.0 Mustang Tech 10
E Leaking Coolant 1996 - 2004 SN95 Mustang -General/Talk- 4
R 94 Mustang V6 Oil Leak! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
P Progress Thread 2000 Mustang Gt Poor Acceleration And Performance 1996 - 2004 SN95 Mustang -General/Talk- 5
U Ford Mustang Gt 2007 Coupe 4.6l Rear Right By Tires Leak? (picture Included) 2005 - 2009 Specific Tech 3
R Mustang Leak SN95 V6 Mustang Tech 8
R 2000 Mustang Power Steering Leak? 1996 - 2004 SN95 Mustang -General/Talk- 9
S 2005 Mustang Convertible Leaking 2005 - 2014 Specific V6 Tech 3
T Found A Small Coolant Leak, Unsure Of What It Is 2005 - 2009 Specific Tech 2
A Oil Leak/hissing Noise Fox 5.0 Mustang Tech 13
LUKAStheGUNNER Fuel 2001 Mustang - Check Gas Cap Light Problem SN95 4.6L Mustang Tech 2
V 2006 Mustang Convertible V6 With Strange Fluid Leak 2005 - 2014 S-197 Mustang -General/Talk- 2
L 2003 V6 Mustang Oil Leak Above Oil Filter SN95 V6 Mustang Tech 1
E Roc 1996 Mustang Gas Tank Leak. SN95 4.6L Mustang Tech 4
G 2015 Mustang Packaging Guide Leaked 2015+ (S550) Mustang -General/Talk 0
M 2000 Mustang 3.8 Base...rear Seal Leak Help? 1996 - 2004 SN95 Mustang -General/Talk- 1
S 98 Mustang Gt. Leak Problem 1996 - 2004 SN95 Mustang -General/Talk- 1
S 98 Mustang Gt Coolant Leak Problem 1996 - 2004 SN95 Mustang -General/Talk- 5
MRaburn 2015 Ford Mustang Leaked Ahead Of Debut StangNet Site News 1
68dustin New Mustang Leaked Early? 2015+ (S550) Mustang -General/Talk 22
M Engine 95 mustang v6 t stat housing leak SN95 V6 Mustang Tech 0
tech0925 2000 Mustang GT Radiator leak around rubber grommet? SN95 4.6L Mustang Tech 1
J Does Your Mustang Convertible Top Leak? SN95 V6 Mustang Tech 1
Similar threads