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Old 05-01-2014, 09:21 AM   #1
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Forest River Owners Club
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Speedometer problems

I have an 1999 Freightliner Sport Chassis with the CAT 3126b and 6 speed auto, my speedometer has always been about 5 miles an hour fast, but after power washing the under side of my truck including the transmission housing it now reads 15 miles an hour faster, I havent got back undef it to see if I knocked a wire off a sensor, any ideas ? Thanks Iin advance Lyman

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Old 05-01-2014, 11:48 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 15,635
A wire off a sensor would light up the check trans or check engine lights.
There are two sensors on the trans, one on the bell housing, another on the tail shaft. You may have pushed water into the sensor wiring connector, time to pull them apart dry them out and clean with a contact cleaner spray . Walmart, Auto Zone ,Napa all have the spray .
May be an explanation for the change but I doubt that it would be the cause of the original 5 mph, discrepancy . Has the tire size been changed, from factory original?

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 05-02-2014, 09:34 PM   #3
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Thanks that advice led me to blow the connectors and hit them with some WD-40, it didnt solve the problem right off the bat, but about an hour into my drive I noticed the speedo was now with in 2 MPH faster than the GPS
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