1996 C3500 dually....speedometer no longer accurate after transmission swap.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72freak · 01-14-2018, 06:22 PM

I've trolled around the internet looking for answers and all I have found is take it to the stealership.?!?!

One of our work trucks we dropped at the transmission shop a while ago and had the 4L80 replaced. After quite a while the driver finally let me know the speedometer was no longer accurate. At 60 its showing close to 80-.

Its an electronic transmission and no speedo gear so I assume re-setting it is done through a scanner or computer.

What is the correct terminology for what needs to be done, what has happened, or basically whats going on??

Thanks

diveplane · 01-14-2018, 11:58 PM

could be the speed sensor , and its just a coincidence its went out soon as u got transmission done.

i tested my steam gauge via my phone app it was very accurate.

other thing might be the gauge cluster speedometer itself went bad or starting to.

needle pointer type?

01-14-2018, 06:22 PM	#1
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	1996 C3500 dually....speedometer no longer accurate after transmission swap.. I've trolled around the internet looking for answers and all I have found is take it to the stealership.?!?! One of our work trucks we dropped at the transmission shop a while ago and had the 4L80 replaced. After quite a while the driver finally let me know the speedometer was no longer accurate. At 60 its showing close to 80-. Its an electronic transmission and no speedo gear so I assume re-setting it is done through a scanner or computer. What is the correct terminology for what needs to be done, what has happened, or basically whats going on?? Thanks __________________ 2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! *It's not just a hobby..It's a LIFESTYLE!!!* Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere!

01-14-2018, 11:58 PM	#2
diveplane Registered User Join Date: Nov 2016 Location: Tulsa Posts: 418	Re: 1996 C3500 dually....speedometer no longer accurate after transmission swap.. could be the speed sensor , and its just a coincidence its went out soon as u got transmission done. i tested my steam gauge via my phone app it was very accurate. other thing might be the gauge cluster speedometer itself went bad or starting to. needle pointer type?

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