Hey gus i'm doing a cab swap on my 85 rang and i have to weld some plates on the frame pads where the body mounts go and i was just wondering the best way to drill the bolt hole thanks

 

use a step drill bit.

 

and go slow. Let the bit do the work don't over muscle it. I also always have some WD40 or equivalent in hand to keep it lubricated and help keep the temperature down.

 

or...get a carbide drill.....dont push hard or u'll smoke them use some old engine oil or WD40 or any kind of lubricant..keep your tooling cool when it gets hot it expands makes your holes big yada yada yada gets dull and work hardened where its so hard it wont cut your frame...carbides stay sharp WAY longer and far more superior then cheapo drill bits..ya they are like $9 a crack..but a very good investment...diamond bits are NOT what they are cracked up to be unless your in the machining world like i am..our diamond bits stay sharp (industrials) but public bits are just cheapies with a better name