I currently have 245-65-R17 tires on my vehicle, it is a 2005 Chevy trailblazer LS/LT. Can I put 245-70-R17 tires on this vehicle?

TYres on the same axle must be of the same type and size.

You can, unless it is 4 wheel drive. if it is 4 wheel drive, it will be hard in your transfer case having a different size in the mix. if not, or if you are changing all 4 tires, your seedometer will just read a bit faster

It depends there are 3 speed sensors 1 on each front wheel and 1 on the output shaft of the transmission.They all talk to each other and the computer All generate a refferance voltage .5 volts and send a signal to the pcm or vcm or ecm .Small problem are like the ones on the front big problems the out put shaft

starter is on driver side just below head and bolted into transmission. usually accessed by removing driver front tire and access plate then you are able to look right at it and use socket wrench and various extentions to remove if necessary

One tire size won't hurt. It will affect your speedometer by about 2MPH. That's it. Hope this helps.

I looked up the application at SummitRacing.com and found BellTech Lowering springs. Looked at all applications and it showed that the SSR, Trailblazer and Envoy also use the same springs.

The tire size depends on the vehicle trim level. Below are multiple trim levels and their respective tire sizes.

ES 235/75/15
LS 255/70/16
Limited 255/70/16
XLS 255/70/16
XS 255/70/16

The best thing to do if the vehicle is available is to inspect the tire sidewall for what the current equipment is. There is also typically a sticker in the driver door jamb, center console or glovebox stating the proper tire size & inflation.