1968 C4 transmission question.....

myname182 · 05-15-2001, 07:57 PM

I have a 1968 mustang with a C4 transmission. About a month and a half ago i took my car to local mechanic because it was leaking oil from the transmisison...He went ahead and changed the pan gasket and that was it....the tranny continued to leak, so i went back and he said he had just put too much oil in it and it was leaking from the top spout. So he removed some oil and it still kept leaking. It was no longer leaking from the pan, only from somewhere in the top...I asked him what type of oil he put in it and he said Dextron, i usually put type F...does that make a difference, is that why it may leaking?...i thought you could only put type F...he said dextron is ok...or why could it be leaking??? Help

Rev · 05-15-2001, 08:32 PM

Dextron is definitely wrong. This guy doesn't know his A$$ from his drain hole. Drain the tranny from the pan. Then drain the torque converter from it's own specific drain plug. Then put in FORD type F tranny fluid, shifting into all ranges until full of TYPE F. If it still leaks, then look for where it does specifically leak. Don't over fill, that's the area wher DUMBO was correct.
My $.02.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

myname182 · 05-15-2001, 09:21 PM

thanks...im gonna go buy some type F and take it back to that idiot so he can put it in himself...cause if i do it im gonna have to change the oilpan gasket again, right?..besides i paid him 35 bucks for him to change the gasket and the oil...do you think this month with the wrong type of oil might have cause damage???

[This message has been edited by myname182 (edited 05-15-2001).]

Rev · 05-15-2001, 09:49 PM

I'm not an expert. just an old, experienced gearhead. I would personally just do it my self. Do you really want someone that doesn't know what they are doing re-doing it? Get into doing this stuff yourself. that's really the only sensible way. You can then "hire out' what you can't do yourself. Then at least you are aware of what needs to be done.

rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

Power · 05-16-2001, 02:38 AM

Gotta go with Rev on this one....

If you do it yourself you can know exactly whats done or not done. With old cars it doesn't take much to get down the basics. Just grab a Chilton or Haynes manual and start reading. It will be worth it in the long run.

Dark Knight · 05-16-2001, 10:40 AM

FWIW, you should change or have the filter changed too.. while the pan's off..

------------------
84 convt,'95 302,AFR's, performer
3.55's, underdrives stock shorties
stock cam, 1.7's
14.06@100.21, 255RWHP on a hot day
265 on the mph/weight chart

zach0 · 05-16-2001, 05:36 PM

There is a product that you can add to any of your fluids and what it does is after you drive the car for a while and get the leak leaking again it will give you light that you can shine under the car and the leak will glow and then you can usally pin point it from thier. They sell it here in Va at most of the auto stores.

------------------
66 Mustang Black W/ Black
289 Hi-Po 65'heads, MSD
Lunati High lift Cam
750CFM Carb

j's69stang · 05-16-2001, 05:37 PM

well i put the dextron in my transmission but it is rebuilt and thats all that is in there, no mixing of type f and dextron. the reason i went to dextron was on the cold morning it wouldnt shift out of first with the type f and when i switched to dextron i havent had any problems

Lou Lyman · 05-18-2001, 06:03 PM

I also have a leaky C4. Mine leaks at the seal where the kick-down shaft goes through the drivers side. Fluid drips down and covers the pan so it looks like the pan is leaking (I use type F fluid). You might want to check the seal on yours.

By the way, does anyone know if the kick-down seal can be replaced with the tranny in the car? Anyone done this? Any tips or advice is appreciated.

Lou Lyman

Rev · 05-19-2001, 11:12 AM

Isn't there an O-ring that goes in there. I think mine has one and it can be replaced with trans in the car.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

myname182 · 05-19-2001, 11:23 AM

I got my leak fixed...i went back again to that shop, and got i looked by another mechanic...he took out even more oil and had me shift into all gears before he checked the dip stick...it hasn't leaked since...thx for the help and comments...

[This message has been edited by myname182 (edited 05-19-2001).]

Lou Lyman · 05-19-2001, 06:52 PM

Rev,
Thanks for the info about the "O" ring. One of these days I'll replace it. Probably easier than a seal.

myname182,
Glad to hear yours is fixed.

Lou

Rev · 05-19-2001, 07:34 PM

I may be thinking of the gear selecter shaft that has the O-ring. It's been awhile since I've had mine apart. Can't remember for sure.

Rev

05-15-2001, 07:57 PM	#1
myname182 Registered Member Join Date: May 2001 Location: West Covina, CA, USA Posts: 4	1968 C4 transmission question..... I have a 1968 mustang with a C4 transmission. About a month and a half ago i took my car to local mechanic because it was leaking oil from the transmisison...He went ahead and changed the pan gasket and that was it....the tranny continued to leak, so i went back and he said he had just put too much oil in it and it was leaking from the top spout. So he removed some oil and it still kept leaking. It was no longer leaking from the pan, only from somewhere in the top...I asked him what type of oil he put in it and he said Dextron, i usually put type F...does that make a difference, is that why it may leaking?...i thought you could only put type F...he said dextron is ok...or why could it be leaking??? Help

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05-15-2001, 08:32 PM	#2
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Dextron is definitely wrong. This guy doesn't know his A$$ from his drain hole. Drain the tranny from the pan. Then drain the torque converter from it's own specific drain plug. Then put in FORD type F tranny fluid, shifting into all ranges until full of TYPE F. If it still leaks, then look for where it does specifically leak. Don't over fill, that's the area wher DUMBO was correct. My $.02. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.

05-15-2001, 09:21 PM	#3
myname182 Registered Member Join Date: May 2001 Location: West Covina, CA, USA Posts: 4	thanks...im gonna go buy some type F and take it back to that idiot so he can put it in himself...cause if i do it im gonna have to change the oilpan gasket again, right?..besides i paid him 35 bucks for him to change the gasket and the oil...do you think this month with the wrong type of oil might have cause damage??? [This message has been edited by myname182 (edited 05-15-2001).]

05-15-2001, 09:49 PM	#4
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	I'm not an expert. just an old, experienced gearhead. I would personally just do it my self. Do you really want someone that doesn't know what they are doing re-doing it? Get into doing this stuff yourself. that's really the only sensible way. You can then "hire out' what you can't do yourself. Then at least you are aware of what needs to be done. rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.

05-16-2001, 02:38 AM	#5
Power Registered Member Join Date: Feb 2001 Location: Oregon Posts: 420	Gotta go with Rev on this one.... If you do it yourself you can know exactly whats done or not done. With old cars it doesn't take much to get down the basics. Just grab a Chilton or Haynes manual and start reading. It will be worth it in the long run.

05-16-2001, 10:40 AM	#6
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	FWIW, you should change or have the filter changed too.. while the pan's off.. ------------------ 84 convt,'95 302,AFR's, performer 3.55's, underdrives stock shorties stock cam, 1.7's 14.06@100.21, 255RWHP on a hot day 265 on the mph/weight chart

05-16-2001, 05:36 PM	#7
zach0 Registered Member Join Date: Apr 2001 Location: Hampton, Virginia Posts: 227	There is a product that you can add to any of your fluids and what it does is after you drive the car for a while and get the leak leaking again it will give you light that you can shine under the car and the leak will glow and then you can usally pin point it from thier. They sell it here in Va at most of the auto stores. ------------------ 66 Mustang Black W/ Black 289 Hi-Po 65'heads, MSD Lunati High lift Cam 750CFM Carb

05-16-2001, 05:37 PM	#8
j's69stang Registered Member Join Date: Apr 2000 Posts: 102	well i put the dextron in my transmission but it is rebuilt and thats all that is in there, no mixing of type f and dextron. the reason i went to dextron was on the cold morning it wouldnt shift out of first with the type f and when i switched to dextron i havent had any problems

05-18-2001, 06:03 PM	#9
Lou Lyman Registered Member Join Date: Dec 1998 Location: Tampa, FL Posts: 70	I also have a leaky C4. Mine leaks at the seal where the kick-down shaft goes through the drivers side. Fluid drips down and covers the pan so it looks like the pan is leaking (I use type F fluid). You might want to check the seal on yours. By the way, does anyone know if the kick-down seal can be replaced with the tranny in the car? Anyone done this? Any tips or advice is appreciated. Lou Lyman

05-19-2001, 11:12 AM	#10
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Isn't there an O-ring that goes in there. I think mine has one and it can be replaced with trans in the car. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.

05-19-2001, 11:23 AM	#11
myname182 Registered Member Join Date: May 2001 Location: West Covina, CA, USA Posts: 4	I got my leak fixed...i went back again to that shop, and got i looked by another mechanic...he took out even more oil and had me shift into all gears before he checked the dip stick...it hasn't leaked since...thx for the help and comments... [This message has been edited by myname182 (edited 05-19-2001).]

05-19-2001, 06:52 PM	#12
Lou Lyman Registered Member Join Date: Dec 1998 Location: Tampa, FL Posts: 70	Rev, Thanks for the info about the "O" ring. One of these days I'll replace it. Probably easier than a seal. myname182, Glad to hear yours is fixed. Lou

05-19-2001, 07:34 PM	#13
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	I may be thinking of the gear selecter shaft that has the O-ring. It's been awhile since I've had mine apart. Can't remember for sure. Rev