Dan Fletcher Super Stock Videos - Opinions

[Pat Cook]

I had the same noise on my Fairlane that ended up being the driveshaft. I changed gear ratios from a 4.86 to a 5.14 and it moved the 59" long drive shaft into the critical speed. I had the original shaft balanced and checked twice at different shops, had another shaft built out lighter and larger material, Replaced several tail shaft bushing ( the vibrations was eating them up} removed the tranny and replace all the bushings, new yoke, had the rear end apart, looked at axle bearings...was getting very frustrated. Finally, there was a NASCAR team doing some testing at the Proving grounds were I worked and I ask them who built there drive shafts, They told me about a shop in Michingan, Dynotech Drive shafts, Called them, the guy I talked too guaranteed that he could build me drive shaft that wouldn't vibrate, and he did.
Mark Williams has a good tech article on drive shafts and critical speed
http://www.markwilliams.com/driveshafttech.aspx

[Brian Oakes]

Hey Dan, i think ya get spoiled driving that new car, ya know all them old ones will Vibrate,LOL hope ya fine the problem, let us know what it is. Later Brian

[Dan Fletcher]

I appreciate everyone's input, both here, pm's, and phone contact. Lots of good thoughts. I especially like accelerometer notion and the idea of a chassis dyno.

At this point, there won't be any empirical testing done until Las Vegas. As hard as it is to believe, I've chosen NOT to drive 1200 effin' miles, one way, to Gainesville to finish Charlotte. Stick that whole deal right up your ***. I could maybe get out locally this weekend or next, but my wife and I have scheduled trips to watch our daughter play soccer and I'm not going to screw that up.

So, it will have a different center (read ring and pinion) in it at Vegas. If that doesn't fix it, its going to be time to instrument things up and find a chassis dyno, or start looking for loose sheet metal. If I don't find it soon, I'm afraid it's going to find me.

Good luck to everyone in Gainesville, especially Joe Lisa, lmao.

[racerhead]

Besides being interested in the outcome, that's some cool video.

Bruce Deveau