Richie O

Thanks to our local police radar board mine is 1 mph off at 40 with stock tires.

Thunderhog

Are those things cool or what! according to the magic boards, my speedo is off 1 mph at 45, and my gps is spot on! I run 235 85 16's. stock for a 90, taller than what was on my 85 stock.

Dean Snow

285/75/16 and im dead on

jckdann7

at 65 mph, mines is about 65 off

Thunderhog

Now THATS consistant!

bigbaddiesel416

when i go 70 the thing says 90??? and i am 1 tie size smaller than stock

Power Ram 250 C

At 20mph it's dead on according to my Garmin. At 70mph the speedo shows around 80ish. I am running 265/75/16 and just installed 285/75/16 on aluminum wheels. Right now the faster you go the even faster the speedometer climbs.

GLHS

My old 235/85/16 and new 265/75/16 tires are the same height; 30.5-31".
With new tires my speedo is dead nuts. Once they start getting worn down it's over compensating (too fast) by 1 at 75.

Trooperthorn

Man, I'm ugly enough with my speedo on...You don't even want a mental picture of what I look like with my speedo off...whoops...too late.

bigbaddiesel416

oh man that's foul ah help i cant get it out of my head

93-12Smoke

At 30 mine reads 0, at 55 mine reads 0 and at 70 it also reads 0. At least its consistant. Guess I should by a new gear reduction box huh?

schamran

hahaha. So who has an accurate speedo, with a 5 speed and 3.55 gears? I can't believe our trucks vary so much. (i'm not talking about broken trucks )

Stihl

15 MPH on the slow side going 60

This is with 39.5" Boggers
With 42" LTB's she is around 17 MPH off .. tires make a huge difference

GasganoFJ60

Every time I pass those highway radar trailers that tells you your oncoming speed its usually the same as the speedo. Maybe 1-2 off. And thats running 305's

97catintenn

I fixed mine all by myself.