trans fluid leak
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trans fluid leak
I have a C6 that pushes tran fluid past the tailshaft seal after it is parked and not run after 2 weeks or more. It works good when used reguarly and does not leak when running. But after it sits a few weeks it pushes as much as 1-2 qts on the ground. I know this because I must add about that much when I go to drive it after sitting. I do not have a throttle pressure rod from the carb to the kickdown on the tran. It works good anyway. Could the tran be having a delayed reaction and take 2 weeks or better to alleviate internal pressure from not seeing the throttle pressure rod? Someone mentioned front pump having a problem. I did replace the tailshaft seal and it made no difference in the end. The old seal was ok. The truck gets parked on the smallest uphill incline.
Last edited by 67Pustomp; Mar 2, 2007 at 10:04 PM.
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From: East Flat Rock NC
67Pustomp
If the trans is leaking at the front of the trans, its probably the front pump,
but if it is at the rear of trans and not folowing a path back there, if parked with
the rear of the truck down hill its the rear seal! Was the seal installed with the
hole in the rubber part up, also when I install a rear seal I have cleaned where
the seal mates and I have always added a small smear of (RTV) around the seal area, also your yolk has to fit the rubber part of the seal tight, may sure
theres no groves in the yolk. And if you are under there look to see if your
tranny lines are not leaking.Did you put some trans fluid around the yolk when
you installed the new seal, I think it keep it from burning on the first drive!
P.S. place card board under your trans on the ground and it will tell you where
the leak is!
Wally Womack
If the trans is leaking at the front of the trans, its probably the front pump,
but if it is at the rear of trans and not folowing a path back there, if parked with
the rear of the truck down hill its the rear seal! Was the seal installed with the
hole in the rubber part up, also when I install a rear seal I have cleaned where
the seal mates and I have always added a small smear of (RTV) around the seal area, also your yolk has to fit the rubber part of the seal tight, may sure
theres no groves in the yolk. And if you are under there look to see if your
tranny lines are not leaking.Did you put some trans fluid around the yolk when
you installed the new seal, I think it keep it from burning on the first drive!
P.S. place card board under your trans on the ground and it will tell you where
the leak is!
Wally Womack
Last edited by Pro-Street/StateTK; Mar 2, 2007 at 11:25 PM.
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yeah..been there done all that..when I mentioned the front pump I was refering to the pump itself having a pressure leakdown after sitting awhile not that it was leaking at the front of the trans..it definetally comes from the seal at the tailshaft but only after sitting for longer than 2 weeks
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From: Simi Valley, CA
Originally Posted by 67Pustomp
I have a C6 that pushes tran fluid past the tailshaft seal after it is parked and not run after 2 weeks or more. It works good when used reguarly and does not leak when running. But after it sits a few weeks it pushes as much as 1-2 qts on the ground. I know this because I must add about that much when I go to drive it after sitting. I do not have a throttle pressure rod from the carb to the kickdown on the tran. It works good anyway. Could the tran be having a delayed reaction and take 2 weeks or better to alleviate internal pressure from not seeing the throttle pressure rod? Someone mentioned front pump having a problem. I did replace the tailshaft seal and it made no difference in the end. The old seal was ok. The truck gets parked on the smallest uphill incline.
B5AZ-7A034-A .. Bushing, Extension Housing
B3TZ-7A011-A .. Extension Housing Seal
NOTE: The front pump on a C6 uses a regular seal and a large "O" ring seal.
C2AZ-7A248-A .. Front Pump Seal
C6AZ-7A248-A .. "O" Ring Seal
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From: SW Florida
Is there a vent on top that's plugged? It seems like it would have to be holding some kind of internal pressure to cause this. Perhaps pull the dipstick after a few days to see if there's any residual pressure?
Is there a crossmember under the tailshaft that is filling up with leaking fluid that just takes two weeks to overflow?
Is there a crossmember under the tailshaft that is filling up with leaking fluid that just takes two weeks to overflow?
!["Beemer Nut"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23bc5285' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
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From: "Islander"
There is no "vent hole" in the seal, that is taken care of by the vent on top of the tranny case, only time it will burp is from a overheated tranny with boiling fluid or over filled.
What you have is converter drain back which is normal over time allowing the fluid level in the tranny to raise up a couple inches hence your rear seal leak.
Is this a slip yoke one piece driveshaft 1/2 ton or flange w/iron tail housing case? Either way check the yoke seal and bushing surface for wear and replace bushing, if flange style yoke seal surface and seal replacement. It's rare for that big bearing to fail.
What you have is converter drain back which is normal over time allowing the fluid level in the tranny to raise up a couple inches hence your rear seal leak.
Is this a slip yoke one piece driveshaft 1/2 ton or flange w/iron tail housing case? Either way check the yoke seal and bushing surface for wear and replace bushing, if flange style yoke seal surface and seal replacement. It's rare for that big bearing to fail.
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Thank you all for replies. Beemer Nut probably gave me an answer that I can live with, converter drainback. The truck [swb] uses one piece driveshaft but does have CV joints intead of regular u-joints. Someone said I should put the normal cross in to help for serious burning of the rubber so as to not break. CV have been doing ok.
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Post Fiend
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From: "Islander"
With converter drain back you can develope shift and kickdown lever leaks of th O-ring is old.
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Ford Parts Specialist
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From: Simi Valley, CA
Originally Posted by 67Pustomp
Thank you all for replies. Beemer Nut probably gave me an answer that I can live with, converter drainback. The truck [swb] uses one piece driveshaft but does have CV joints intead of regular u-joints. Someone said I should put the normal cross in to help for serious burning of the rubber so as to not break. CV have been doing ok.
2-C5TZ-4635-C .. U-Joint (1280-Spicer)
Fits: 1964/72 F100 SWB with C-O-M; 3 speed L/D transmission.
These are not CV joints.
Question: What year truck do you have with a C6? Profile says 1967.
NO 1967 F Series truck had a C6 originally.
First use of a C6 in an F Series Truck: 1968.
Last edited by NumberDummy; Mar 5, 2007 at 01:00 PM.
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From: "Islander"
If you have a iron cased tranny it's a FMX box which later became a C-6.
Do yourself a favor and get a good used C-6 core for rebuild as it will be cheaper including core and rebuild cost vs a FMX box. Truck C-6 boxes are getting fewer in the wreckers over time, stock up I say.
A few years ago I met a local (not crazy) FTE member with a 67 with a FMX box that had almost $1,400 in rebuild alone and it still wasn't functioning correctly.
Do yourself a favor and get a good used C-6 core for rebuild as it will be cheaper including core and rebuild cost vs a FMX box. Truck C-6 boxes are getting fewer in the wreckers over time, stock up I say.
A few years ago I met a local (not crazy) FTE member with a 67 with a FMX box that had almost $1,400 in rebuild alone and it still wasn't functioning correctly.
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yuse r crazy..I never said the thing was as it came..best guess its wearing a Linciln mtr cuz' its got the pan that is a bitch with the oringaol x-mbr as in drain plug which is dealable with a 13/16 offset box wrench..to go with that my name is 67 PickUp Stomp..460 warmed up..read my ad
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No it is homebuit with welded up perches for the motor mounts. I got the truck with engine installed and have given it some repairs to straighten it up and have a little fun. I am surprised no one got into it about the Heddman headers as there is no listing for a 460 67-71 application. I ordered for a 72 dent side which did work out ok.
A local business did have an original bought new back then. It was 460,3 on the tree, 2 barrel with 9in., swb
Maybe Number Dummy can list when such a truck became available to help clear my memory. Was there 460 bumpsides with manual trans and shortbox swb
A local business did have an original bought new back then. It was 460,3 on the tree, 2 barrel with 9in., swb
Maybe Number Dummy can list when such a truck became available to help clear my memory. Was there 460 bumpsides with manual trans and shortbox swb
Last edited by 67Pustomp; Mar 6, 2007 at 04:36 PM.