so you are playing tug of war with trucks? cause if so, wow that is dumb.....
see vid
just dumb, dangerous, horrible idea.
You being almost 16, i would tell you to just not do it....
you will not get much respect here due to the fact it is a dumb idea.
but if you choose to do it 4wd put in drive, and go for it.
one of you 2 will need to change a bunch of parts......
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