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Old 09-05-2019, 08:49 AM   #1
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Ford Super Duty Owner
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Is my transmission on the way out?

Just last Friday, returning home in heavy traffic, the tranny started making a noise in the lower gears, something like a whistle or howling sound. It seem to happen when the rpms increased, then subside when shifting to a higher gear. Didnt hear the sound in overdrive. Could it be the torque converter? It is a 99 flair with 106kms. Dont want to ignore the issue and break down when going to Florida this winter.
Any responses are welcomed and appreciated.
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Old 09-05-2019, 12:03 PM   #2
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What year and chassis???


If its a 99 Ford F53, You may want to do a transmission filter change and flush.

You said heavy traffic, if this was very low speed, i.e. stop and go, and it was hot outside, you may have run some high temperatures on the transmission. The first couple years of the V10/4R100 didn't incorporate transmission cooling into the engine radiator, so under these conditions, its possible to over temp the transmission.
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1999 Fleetwood Southwind 35S (Ford F53 6.8L V10 275hp 4R100 4 spd trans) - Toad 2003 Saturn Vue.

It won't do MACH 2, but I can get a sandwich and take a pee.
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Old 09-05-2019, 12:24 PM   #3
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Pull the dipstick and look at and smell the fluid.

If it stinks like its burnt or is dark colored, that's a sign of a failing transmission..
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Old 09-05-2019, 07:11 PM   #4
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I would change all transmission fluid. There should be a plug in the torque converter. Some garages do a flush where they take off a trans line and run motor and trans pump with one line with fresh oil and the other pumping out the old fluid. Its worth a shot. I did this with my Ford van that had same symptoms and this cured problem. Had to do It twice though, because garage did not drain torque converter
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Old 09-06-2019, 08:17 AM   #5
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Thanks for the replies.
Yes, it is a 4R100 tranny on a 99 F53 v10. The fluid is fairly clear, changed 2 years ago. Gone to Florida twicw since. I will change the fluid with synthetic Mercon V right away, and will make sure to drain converter too. It smells burnt. It was in stop and go traffic, warm weather that the noises started happening. Nothing yesterday when I test drove it.
Thanks
Dan
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Old 09-06-2019, 12:54 PM   #6
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I flush mine using the cooler return line method, Takes about 5 gallons. I use Valvoline ATF Synthetic.

Here is a article on changing the filter and flushing the transmission:

F53 – Transmission filter change and flush – 1999 Southwind 35S

Here is an article on rebuilding the bypass tube:

F53 – 4R100 transmission cooler bypass tube – 1999 Southwind 35S


Recommendation for stop and go traffic. When I'm in stop and go, I slide the shifter into "N" while stopped to help reduce the heat thats generated by the torque converter.
..
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1999 Fleetwood Southwind 35S (Ford F53 6.8L V10 275hp 4R100 4 spd trans) - Toad 2003 Saturn Vue.

It won't do MACH 2, but I can get a sandwich and take a pee.
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Old 09-06-2019, 01:26 PM   #7
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Burnt fluid is a bad thing. It means fiction clutches are slipping or dragging causing high heat.

Do you fix it now or on a long trip.

Time for an expert opinion, rather then pouring money into fluid changes.
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