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Dirk’s ’73 Pony gets a Refreshed Tranny

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The 2013 Route 66 Fun Run was the hardest I ever drove my 73 Mustang and I was totally impressed with the way it was running. The only problem I ever noticed was the clunk when it was put in reverse or drive. The clunk was there when I bought the car. I never had any clue as to the amount of wear and damage that existed inside the transmission. When we changed fluid there was nothing in the pan! That is usually the first place you would see anything.

20130514-DSC07767For many years the FMX transmission was the preferred transmission for racing because it was considered indestructible.  It was a simple rugged design that is still in use today because it can handle up to 1,200 horse power.

The Ford 9 inch rear end is also a preferred racing component because of the rugged design and the horse power it can handle. Mine is a 3.25:1 traction lock that is about the best street rear end you can get.

The 351 Cleveland motor is also legendary for it’s low end torque. All of these components are becoming hard to service because the ones still in service are slowly eating away at the parts supply.

Now that everything is (I hope) in good working order the drive train on this car should last a very long time!

The car is now back on the road. After searching for some hardware to repair fluid lines for transmission cooling it took about 3 hours to put everything back together. After adding 4 quarts of fluid we started the engine and shifted it though the gears. Sounded fine so we added another 4 quarts of fluid and ran it through the gears. This was to get the fluid moving though all the components and fill the torque converter. After determining the transmission still needed a couple more quarts of we put them in and started the engine again. We let it get to temperature and start looking under the car for leaks. Everything was good.

The 2013 Mesa Super ShowI took the car on a test drive and it ran well. NO MORE CLUNK WHEN PUTTING IT IN GEAR!!! It up shifted and down shifted automatically and manually without problems. I am going to spend the next 200 miles taking it easy and letting it settle down.

This is significant because now I have the original transmission (all ID the tags and casting numbers match) in the car which can make a difference at a concourse show or the cars value later.

Jeff and J R at Super Discount Transmissions did everything they could to get my transmission repaired. People searched for hours to locate parts and J R worked overtime. This transmission needed a lot of parts so it was totally dismantled. You would have been amazed if you saw the boxes of parts and the damage to many of them. They could not test it because they did not have the car. It worked first time the car was driven! Thanks to Kyle Koerner of 66Customs for getting the transmission out and then installing it.

If my car has feelings it would be very happy!

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