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Overhaul of a Ford FMX Transmission
#1
For two years I haver been working on my Mustang Mach 1.
The last weeks i spent most time repairing my FMX transmission.

First I purchased literature to get useful Informations.


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Next step-disassemble


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After basic cleaning of the major parts I started to disassemble the
Valve Body, front and rear servo.


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During dismantlement I made pictuers of every step. Otherwise you ll have a big puzzle. Huh


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#2
Sounds like a good plan. Something I want to try my hand at in the future. How did it all come out?
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#3
I cleaned all parts with cellulose thinner. Finally I used copressed air to get all dirt particles of.

Next step - disassemble the front and rear clutch durm.


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Inside this two parts are two aluminium pistons with a check ball on each. On the pistons are sealing rings. To get the pistons out of the drums, use compressed air. I changed all sealing rings.


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It s a gadget to get the piston with new sealing ring into the rear clutch drum. With Scotch tape I wraped the piston. After the piston was in positon, I removed the tape.


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Assembly of the rear clutch drum. Pictures tell more than thousand words...


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Important!!! Check the clearance between the pressure plate and the internal plate. About 1 mm is a good mediocrity. THATS JUST MY OPIONION!!!


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At least, the two thrust washers


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I installed new clutch discs. Before installing I soaked them for 20 Minutes in trasmission oil.
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#4
Assembly of the front clutch drum...


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Like at the rear clutch drum, its important to have about 1mm clearance between pressure palte and the last clutch disc.
Next logical step-changing the metal seal rings on output Shaft and Sun Gear Shaft


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After checking the bush bearings, I decided to order a set of bearings.
Here to examples of worn bearings (Rear Extension Housing and Oilpump)


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#5
Small things can breed big problems. In my case-a missing needle roller!!!

During disassembling my FMX I found out, that one needle roller was missing. In the past, an "expert" scamped on my FMX.

You can´t imagine how difficult it is, to get a needle roller or bearings in non metric dimensions.
15 phone calls with the leading companies in Austria, but not one positive answer.

In the end a friend found out, that the needle rollers on the U-joints of my MUSTANG are in same dimension. All I had to do - shorten them about 2 mm.
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#6
Did you have bad seals, or a bad pump? Most hard parts look good

[Image: 1_30_09_13_10_12_32.png]
Alan L
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#7
Wow - great post for anyone (like me) with an FMX tranny. I'll be coming back to this thread in about a month (hopefully).

Doc

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
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#8
not2old;17539 Wrote:Did you have bad seals, or a bad pump? Most hard parts look good

Hi
I decided for a full restoration - No compromise
And I was right-a needle roller was missing and the bearings are badly worn.

kind regards
Wolfgang
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#9
Very nice post Wolfgang, keep up the good work.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#10
Continued

One of the easiest way to get the bearings in their bearing seats, is to cool them. I put all bearings for some hours inside the freezer compartment.

The parts with the bearing seats I put into an oven.


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In a turnery I ordered "special tools". This peaces are made of aluminium, wich softer than brass. Thats important to prevernt damage during installation.


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Next step - assembling of the clutch units.

To fix the needle rollers I used vaseline.


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The two washers and the sun gear shaft are in place


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Ready for installation


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Next I took the transmission housing and inserted the front band. After the front band, followed rear band clutch unit, center support.

   


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At last the planet carrier


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More pictures

   

   


Attached Files
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