LS1_Sean

iTrader: (1)

How much will my speedo be off after 4.10's?

silverM6TA

iTrader: (5)

Just had my 4.10's installed. I have 275/40/R17 and the 4.10's. My speedo reads 60 when im really going 50. Its off by a percentage.

caddy03pimpin

iTrader: (18)

depends on your previous gearing and tire size

silverM6TA

iTrader: (5)

im guessing he has 3.42's which is what i had so his tire size would matter. my previous tire size was 245/50/R16 if that helps.

Finkledbody

You never got that tuned or calibrated? Your car will read 60k miles when you really only have 50-55k miles on the clock in no time at all. But to each his own.

nfs1976

Being off by a percentage, the faster you go, the further off your speed will read. A tool I use to verify gears when I buy a vehicle can be found at http://www.f-body.org/gears/ ... Very customizable tool to determine what actual speed you would be travelling in each gear at any given RPM. Saves a lot of tedious math.

tnmotown

iTrader: (107)

Well i have a M6 tranny and was around 88-90mph on stock 3.42 gears around 2K rpms in 6th gear

Now with 4.10s' im around 70-72 at the same rpm's and in 6th gear.

406malibu

if you had 3.42's before and you put 4.10's in, then you're speedo will be reading 1.1988 times higher than what you are actually going.

LS1_Sean

iTrader: (1)

i have 275/40/R17 tires and 3.42 gears. so i should expect 10mph?

jimbo98z

iTrader: (3)

It's a percentage (about 20%), not a fixed amount faster than you are actually going. At 30 your speedo will read 36, at 60 it will read 72 and at 100 it will read 120, etc. Best to just get someone to tune the car so it reads right.

LS1_Sean

iTrader: (1)

Thats what im going to do. a guy i know has a tuner shop so ill take it to him. i was just wondering how off it would be till i got it tuned.