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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

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  #1  
Old 02-16-2010, 08:44 PM
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KraZeDav KraZeDav is offline
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auto transmission fluid? FMX or C6 tranny

How do I identify my Tranny and Type of fluid to use?
I'm confused. I have a 1975 F350 RV w/ 460.
My automatic tranny was leaking from the pan gasklet. Should be an easy fix. Drop the pan and change the gasket.

In the past I have been told to use type F in older Ford trans.
The Haynes manual I have has confused me.
I thought I had a C6 tranny. no overdrive
Haynes Manual Ch 7B "...C6 for all other V8 engines. The FMX was installed on some F350 Vehicles until 1978.

Here is why I am confused
Haynes Manual Ch 1 -Reccomended fluids -
C6 = Dexron lll or Mercon
all others type F
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  #2  
Old 02-16-2010, 09:10 PM
HillbillyDeluxe81 HillbillyDeluxe81 is offline
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Ok, forget the FMX, you have a C-6. Pre 77 models use Type F. 77 and later use Dex/Merc. If your transmission is an original 75, use type F. If the transmission is from a later model, or has been rebuilt using the later style frictions....use Dex/Merc.
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Old 02-16-2010, 09:31 PM
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Thanks, that's a relief. I bought 10 qt of Type F "Castrol" yesterday and a gasket.
I guess if I really want to know more about the FMX that was mentioned in the manual I'll start another thread . Another day.
I just found this info in an old thread.
I guess the Haynes Manual writers had a little to much to drink that day.


Quote:
Originally Posted by horsepuller View Post
Click here: Havoline Mercon V

I couldn't cut 'n paste the url from the adobe file. In case you don't have Adobe 6.0, here's what it said:

Havoline Automatic Transmission Fluid MERCON V is
designed specifically for use in Ford Motor Company
transmissions that require a MERCON V fluid. The
enhanced properties of the MERCON V specification
offer premium performance in MERCON or DEXRON-III
applications.
• Always check your owners manual to determine the
proper automatic transmission fluid for your transmission.
• Ford transmissions manufactured before 1977 and
some pre-1982 transmissions require a Type F fluid
such as Havoline ATF Type F.
• Chrysler transmissions manufactured after 1996
require either ATF+3® or ATF+4®3.
Havoline Automatic Transmission Fluid MERCON V
meets or exceeds:
• manufacturer's performance requirements
— Ford MERCON, MERCON V
— General Motors DEXRON-III
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Old 02-17-2010, 07:55 PM
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two part question

Quote:
Originally Posted by HillbillyDeluxe81 View Post
Ok, forget the FMX, you have a C-6. Pre 77 models use Type F. 77 and later use Dex/Merc. If your transmission is an original 75, use type F. If the transmission is from a later model, or has been rebuilt using the later style frictions....use Dex/Merc.
Part 1
If I presume that the C6 is original then Type F is the right fluid.
If the previous owner(s) had replaced or rebuilt it and it now requires Dex/Merc fluid, What bad thing will happen if I use Type F.

Part 2
I boughta Felpro gasket at Auto Zone. It is not cork like the one I took off. Might be a good thing.
It says do not use any sealant with this gasket. Is this a good gasket or is there something better
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Old 02-17-2010, 08:03 PM
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part 1

look at your dipstick tube does it say use type F? type f is similar to the fluid that is sold as trick shift for harder shifts so in a trans that wants mercon you'll see firmer shifts but in a trans that wants type f you might see some slipping

part 2

yeah that is a good gasket just be sure not to over tighten
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Old 02-17-2010, 08:11 PM
HillbillyDeluxe81 HillbillyDeluxe81 is offline
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Answer 1: Dex/Merc has a friction modifier...(it's more slippery). If you put it in a 76, it'll cause it to slip. If you put Type F in a 77, it will increase friction on the bands/clutches.....probably causing them to wear faster and/or shudder.

Answer 2: When you say sealant, are you referring to the stuff you squeeze out of a tube?? AKA RTV gasket maker?? Or, do you mean actual gasket SEALANT (the stuff in a spray can).
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Old 02-17-2010, 08:17 PM
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Quote:
Originally Posted by HillbillyDeluxe81 View Post
Answer 1: Dex/Merc has a friction modifier...(it's more slippery). If you put it in a 76, it'll cause it to slip. If you put Type F in a 77, it will increase friction on the bands/clutches.....probably causing them to wear faster and/or shudder.

Answer 2: When you say sealant, are you referring to the stuff you squeeze out of a tube?? AKA RTV gasket maker?? Or, do you mean actual gasket SEALANT (the stuff in a spray can).

#1
I guess I'll find out. In 2 weeks I drive this beast to Phoenix and Back

#2 either one . I just want to to put this pan back on once with no leaks.
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  #8  
Old 02-17-2010, 08:28 PM
HillbillyDeluxe81 HillbillyDeluxe81 is offline
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Ok, if in doubt, use the Type F. It's the lesser of the 2 evils.

Don't use any RTV on the gasket. However, some spray gasket sealant is probably a good idea......unless the gasket says specifically that the gasket should be installed dry.
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  #9  
Old 02-17-2010, 08:31 PM
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Quote:
Originally Posted by fordtech08 View Post
part 1

look at your dipstick tube does it say use type F?
WOW !!!!! You are my HERO.
I must have been having a senior moment.
I know I have pulled that dipstick more than once an read it.
This RV sits alot.
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  #10  
Old 02-17-2010, 08:41 PM
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KraZeDav KraZeDav is offline
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Quote:
Originally Posted by HillbillyDeluxe81 View Post
Ok, if in doubt, use the Type F. It's the lesser of the 2 evils.

Don't use any RTV on the gasket. However, some spray gasket sealant is probably a good idea......unless the gasket says specifically that the gasket should be installed dry.
Thanks a bunch.
It does say use dry. I was just fishing for some tips and I got what I was looking for even though the answer was on the dipstick all this time.
I should change my name to "Dipstick"
I'm a regular user of a similar website "Jeepforum.com" and both have very knowledgeable and helpful people.
Now I have another site to burn my idle time with.
Thanks again
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Old 02-17-2010, 08:46 PM
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glad to help hope you enjoy the trip
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  #12  
Old 10-30-2010, 01:30 PM
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Thread revival. I had a great trip. A few months after I got back the pan started leaking again. I hate leaks. It makes a mess on my driveway.
I used a torque wrench so I would not over tighten. I re-torqued the pan bolts again. It still leaks while just sitting there.
The hardest part about dropping the pan is removing and re-installing the frame cross member bolts.

any suggestions on better gaskets.
Click the image to open in full size.

The pan just after I replaced it.

Click the image to open in full size.

There is some minor leakage from the threads on this shift adjusting bolt I found before I changed the gasket.

and I have a small oil leak from the main rear seal on oil pan I presume, but that is also minor. It's making a mess in my drive way
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Old 10-30-2010, 01:30 PM
 
 
 
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