Anyone using a (re-sized) V6 driveshaft with a big block engine?

[lilbowtie]

Please do some reading on Drive Shaft Critical Rpm - Precision Shaft Technologies has a nice chart. I found out the hard way.

 

[64nailhead]

I had my dad cut, shorten and re-weld a driveshaft for me on an 83 Monte Carlo once. He didn't have any special tools and no way to balance it. He told me that he wasn't sure if it would even work without vibrating at speed and to take it easy on it. Well I was about 21 or so at the time and I had faith that dad could fix it if anybody could. Lol. Plus, my friend and I really wanted to get the car back on the road.
We put the driveshaft in and my friend and I decided that if it was gonna break, we should find out as soon as we could so we wouldn't have very far to walk. Lol. As soon as I got on the road I floored it and it actually stayed together. We were pretty happy so we took it up to about 100mph just to make sure there weren't any vibrations. It never had a problem. We used that driveshaft for a while. We also only had about half the torque and horsepower that you're planning on making.
There's no way I'd want to try that again! Lol.
We got very lucky.

I have to say, with a silly look on my face, this is a story that you shouldn't ought to tell. It's like taking off in a jet and being unsure of how much fuel you have.

 

[Opie Knievel]

I have to say, with a silly look on my face, this is a story that you shouldn't ought to tell. It's like taking off in a jet and being unsure of how much fuel you have.

I was young, inexperienced and thankfully lived through it. Lol. I don't mind telling stories of stupid things I've done in the past. You'd better believe that I learned from all the experiences in my life though.
I definitely wouldn't try it again. I'm not the reckless kid who thought he was invincible now.

You gotta give my dad credit for cutting and welding a driveshaft in the driveway with no way to balance it and it actually holding together and not vibrating though. I know it impressed me. Not recommending anyone else to try it but come on, how cool is that in itself?