[93formula]

i got a guy whos bent 2 drive shafts.

the car is a ls1 f body. he is the original owner, road races but doesnt drag race. the car is pretty much stock.

the first drive shaft bent with original suspension. at speeds of about 220-230 km/h. well some serious vibrations were met.

then it was replaced by a shop with a steel drive shaft for temporary use. tested it, ran fine for a bit at speeds of 220 km/h. then a short while later the vibrations came back.

went to the shop again, it was bent.

the only differenced between the two times was the second time he had some suspension mods done like new konis, relocation brackets, eibach pro kit, aluminum lcas.

now what the hell would cause two drive shafts to bend at speeds of over 220km/h???

[z28barnett]

i got a guy whos bent 2 drive shafts.

the car is a ls1 f body. he is the original owner, road races but doesnt drag race. the car is pretty much stock.

the first drive shaft bent with original suspension. at speeds of about 220-230 km/h. well some serious vibrations were met.

then it was replaced by a shop with a steel drive shaft for temporary use. tested it, ran fine for a bit at speeds of 220 km/h. then a short while later the vibrations came back.

went to the shop again, it was bent.

the only differenced between the two times was the second time he had some suspension mods done like new konis, relocation brackets, eibach pro kit, aluminum lcas.

now what the hell would cause two drive shafts to bend at speeds of over 220km/h???

Drive shafts have what is know as a "Critical Speed".

At this "Critical Speed", the imbalances in the drive shaft cause it to flex slightly, this flexing causes more imbalance and more flex. This cycle can continue until the drive shaft fails. If you are lucky it won't pole vault the car end over end.

The LT1 steel drive shaft had problems with the 3.42 gearing, the drive shaft was at "critical speed" near the top speed of the the car and even had some vibration at around 80mph. I remember some magzine testing crew that lost a drive shaft at 150mph. They were lucky and nothing really bad happened.

The critical speed is related to the stiffness and weight of the drive shaft. You will want a larger diameter aluminum or CF shaft.

If the bending is only happening at speed and is not related to suspension problems binding the drive shaft some how. Then your guy has almost lost the drive shaft twice. If you want to run that speed safely you should run out and buy a better drive shaft.

One other thought, have you checked your transmission rubber mount? If it has split it could be letting things flop around and causing failures due to that.

http://www.gmpartsdirect.com/results.cfm?s...umber=SS-Camaro

At the bottom of the above page they list the LT1 & Ls1 aluminum drive shafts.

Z28