Are these trucks metric or SAE? 2001+ in particular ... thanks in advance.

 

They're mixed (both)

 

What are the most commonly used standard sizes? I have a pretty complete metric set ...

I need to check the vac lines for 4WD issues today, any idea what the bolts on the battery tray are offhand?

 

metric I believe

 

Yep, mostly metric.

 

I just use metric on most things since they increase in size by only 1 millimeter for each wrench.

They work fine for most US standard applications unless you are really putting some tork on a rusty bolt in US standard...then the standard wrenches work better.

 

I feel like everything I do on the blazer, I'm always having to use the 15mm socket...which always seem to escape after the first bolt comes out[:@]

 

Yeah, this is how they line up...

US Metric
1/2" 13mm
9/16" 14mm
5/8" 16mm
11/16" 17mm

 

thanks all

 

Using a 13mm socket on a 1/2' bolt head is a good way to round it off [&o]