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Thread: Speedo help
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09-03-2008, 03:26 PM #1
Speedo help
Tires were changed from
stock 16" to a 17"
speedo is 10mph off how do i fix that
stock tires 245 50 16
new 315 35 17
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09-03-2008, 04:27 PM #2
10mph off at what speed? Your speedo shouldn't be off by more than 1 to 2 mph at 60mph between the 2 tire sizes. They have less than .05 inches difference in overall height so basically the same circumference. Chances are you speedometer was off before you changed tire sizes.
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09-03-2008, 04:49 PM #3
yep, the tire calculator says if your speedo says 65mph you're actually going 65.09mph so less than 1mph difference between those 2 sizes.
You can fix your speedo by getting a tune or with a handheld tuner. What makes you think it's 10mph off?
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09-03-2008, 05:00 PM #4
Speedo off all speeds
dont know if factory gears were changed
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09-03-2008, 05:04 PM #5
take it to a gm dealership and have them check it and fix it. Simplest way to take care of that.
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09-03-2008, 05:12 PM #6
I feel its off because i fly by like
every one is sitting still
plus ive followed a few semis i know are govened speed at 62
and my speed reads 52
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09-03-2008, 05:14 PM #7
Gm dealer told me to buy a
vss buffer ..
Would a tranny shop be able to help??
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09-04-2008, 06:14 AM #8
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09-04-2008, 01:39 PM #9
All day every day im out there
i know what companys are and which
are not. But thank for a reply.
Stopped at tranny shop tonight they
said something about a drac modgule being bad
and to go the dealer??
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09-04-2008, 02:05 PM #10
let us know how it works out for you
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09-04-2008, 10:53 PM #11
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It is simple to correct with tuning software or even a handheld tuner. But first, you need to know what the rear end gear is.
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09-05-2008, 12:25 PM #12
Thanks that seems to be my best option
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