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Overhaul of a Ford FMX Transmission
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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Sounds like a good plan. Something I want to try my hand at in the future. How did it all come out?
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.
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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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.
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
Wow - great post for anyone (like me) with an FMX tranny. I'll be coming back to this thread in about a month (hopefully).



[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
not2old;17539 Wrote:Did you have bad seals, or a bad pump? Most hard parts look good

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
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]

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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