That's a thing? I knew of the fiberglass wrapped truck driveshafts but I had no idea these had anything inside.
Vibration!
- Thread starter Irishspring46
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While I haven’t cut a Gbody driveshaft in two, it’s pretty typical for GM to use some sort of a cardboard type material inside for sound dampening. Couple old timers I worked with some years back told of chasing a vibration which turned out to be loose material inside the driveline so I threw it out there for consideration
Brilliant, thanks for sharing! That's a source that I believe very few of us would think of. On a side note, the 3 GM truck/Suburban shafts I've cut open were completely empty, leading to my assumption.
I've ripped 2 stock shafts apart over my G-body years. Neither of mine had any sort of packing where I twisted them in half.
Maybe. But cardboard like material has been found in older Corvette shafts, Ford truck shafts, GT-R shafts, etc., so it certainly was a "thing" for NVH considerations.
I can't say first-hand about G-body shafts, as I've never had to cut into a G-body driveshaft. And none of my 307s won't twist one apart, so...
This is from a 2010 GM truck, 6.2L, which blew out at 110mph. And that is why the engineers put speed limiters on these things. I think the truck was tuned taking out the speed limiter, and 100+ mph was over the critical speed limit for the shaft. Shaft go BOOM!
Maybe he should cut his shaft in 2 and see if the deadening material is coming apart and then reweld it while burning the material inside.
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