I have read somewhere that guys will put their trucks in 4x4 when racing to keep the tires from spinning. Makes a lot of sense but how fast should you go in 4x4? I always thought you should keep it under 50?

Hope this was the correct place for this post.

Many guys have went over 100mph in 4wd.

Do a search. if you look about 1/2 way down this page you will see a post on this same subject.

I trap at over 100MPH. Not good on it but it seems to live

Many guys have went over 100mph in 4wd.

Looks like closer to 130mph now :ro)

At what RPM is it safe to launch a stock 2x4 and how long do I hold it there? (no gauges)

At what RPM is it safe to launch a stock 2x4 and how long do I hold it there? (no gauges)

Your not going to be able to hook up w/ too much boost on a 2wd w/o some suspension work.
Just start lower, like 1000-1200 rpm and keep bumping it up and see what works best.

Track conditions make a big difference too.

I wouldn't build boost for any longer than u need, builds a lot of tranny heat.

Thanks Dmax Tim