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Old 11-14-2017, 12:54 PM   #1
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2000 F53 Chassis - 3rd gear vibration under load

2000 F53 Chassis, 27k miles, have had it 3 years for a total of 5k miles +/-

Road trip last weekend, freakishly cold for November in PA. 13 deg.. During the trip it was fairly windy and cooler than normal. about 140 miles in I noticed a vibration in 3rd gear on an incline, 3k on the tach from about 48-65 mpg. When I lifted off the gas it upshifted and then stopped. Happend several other times during the return. It also hits a wall when you get to about 65 mph.

I also blew a coolant resivior as well, good thing for duct tape (totally unrelated).

Anyways, I have dumped the trans fluid/torque converter as well.Refilled with fresh and also I put in 5 bottles of techron. Issue has persisted. I am doing the fuel filter tonight which I assume has never been changed as well. Any other ideas?
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Old 11-14-2017, 01:12 PM   #2
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A couple items that may effect your model:

1) There is a TSB for transmission shifting, May be causing some of your problem... The special wiring harness is no longer available, but I did the TSB on mine and re-used the existing pins on the plug. You can read about it here:

F53 Transmission shifting weird in 1st and 2nd gear – 1999 Southwind 35S

2) There is also a TSB for wheel vibration in the 45 to 75 mph range. It involves mounting the wheels on the hubs using sleeves in order to ensure the wheels are centered on the hubs. Mine had a funny vibration, after doing the TSB, the vibration was gone... Read about it here.

Funny vibration around 50 mph – Wheel Centering on F53 – 1999 Southwind 35S

..
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Old 11-14-2017, 01:56 PM   #3
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Bad coils often cause vibrations or shudders that go away as speed and load change.

And tell us more about the 65 MPH thing. Won't go 66? Drives ok at 64?
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Old 11-14-2017, 02:00 PM   #4
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I noticed a similar sensation driving up the modest hills in Austin TX. In my case I had a dead coil on the plug. I was getting bad gas mileage but this being my first V10 it didn't shudder like a V8 with a dead cylinder.

HELP..Multiple Misfire Code P0300

HELP..Multiple Misfire Code P0300
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Old 11-14-2017, 02:37 PM   #5
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Also look carefully at the U-joints and the drive shaft bearings. Give them a squirt of grease while you're under there...
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Old 11-15-2017, 12:22 AM   #6
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Quote:
Originally Posted by tderonne View Post
Bad coils often cause vibrations or shudders that go away as speed and load change.

And tell us more about the 65 MPH thing. Won't go 66? Drives ok at 64?
very good possibility bad coils. Vibration or shudder under load with a V10 is generally a sign of bad coil(s).
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Old 11-15-2017, 08:13 AM   #7
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P0301, P0305, P0306, P0309

So after trans fluid change, fuel filter change, unrelated coolant res change, tonight I will be replacing coils and plugs for a few cylinders...

Don't think its the front wheels... they have been mounted for a few trips.

At 65 mph on grade/load would run out of power.
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Old Yesterday, 04:37 PM   #8
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10 new plugs and several coils and we are good to go.
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Old Yesterday, 09:51 PM   #9
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Good to know that cured your problem. Just curious what did you torque the plugs at? The reason I ask is I used 28 ft/lb when I changed the plugs a little over 4,000 miles ago. My doing so was based on this web sites FAQ #51 & 52.

FAQs Why do you prefer 28-32 foot lbs torque instead of the factory specification
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