Do I have to change my gear ratio

[HtxChapter]

When I bought my 2015 silverado it came with 255/70/17 tires/rims, but I recently purchased some 22-inch rims with 285/45/22 tires. I'm not sure what gear ratio I have on my truck and I also don't know if I need to changed them.

 

It's a 2015 Regular Cab Silverado LS 4.3L

[newdude]

4X4?

[afireinside7444]

Look in upper glove compartment GU4 is a 3.08 GU6 is 3.42 on the RPO codes

[Rawyzf]

I don't see any reason as to why you'd have to change them. Usually only need to change with a big lift and big tires.

[cjlet]

285/45R22 is a stock GM tire/wheel combo so no need to change your gear ratio.

[nadrojcote]

Your speedo will be off by about 3% I wouldnt worry too much about it.

 

http://www.1010tires.com/Tools/Tire-Size-Calculator/255-70R17/285-45R22

 

You could get a tuner to calibrate your speed.

 

I'd also suggest using a gps speed app on your phone and see how far off it is from your speedo.

Edited September 28, 2015 by projectsummit

[NitroDatsik]

If is 2wd then you have 3.23 and you don't need to change the. I didn't and I'm running 305-55-20

 

2014 Silverado 2WT CC Summit White 4.3L V6

DROPKICK Edition

IG: jorge_dropkick_rangel