Aftermath of driveshaft mishap: Lessons Learned
11-21-2004, 12:35 PM
#41
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Originally Posted by Snake Eater
I'd look like an idiot the whole 2 seconds before i died.
BTW - very nice write up.....I need to find out my RPM in OD at 115 - trying to figure out why my truck starts vibrating at that speed....wheels/tires or driveshaft?
11-21-2004, 12:36 PM
#42
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Originally Posted by Yelo
I DO have a 72" aluminum driveshaft.....and I DO have vibration issues at certain rpm's (speed doesn't matter)....and my driveshaft has a couple of nicks in it from hitting a rather large rock that came off the back of a truck ahead of me
It looks like i'll be calling the Dealership for another......
It looks like i'll be calling the Dealership for another......
11-21-2004, 12:42 PM
#43
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Originally Posted by Naked AV
Wow, looks like The General is cutting corners all over....I thought it was only the Suburbans and AVs. This is in your 2500? Sounds like you're out of balance after the run-in with that rock.
11-21-2004, 01:14 PM
#44
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If the vibration is not related to speed, it isn't the driveshaft. If it's related to engine RPM, it's before it gets to the driveshaft, like maybe the fan, or some other pulleys, might even be the flex plate by some odd chance.
11-21-2004, 01:36 PM
#46
Originally Posted by Naked AV
Grippy - power is not the issue, it's RPM. Not sure about the 2-piece shaft, I'm leaning towards not. Like I told you in email, this event reminded me that I have a 1500 truck, not a 2500 or a race car. The driveshaft is just one weak link in a chain. Also in that chain are the already proven weak 4L60E transmission and a puny 8.5" 10-bolt rear end. Compounding matters is the 3 tons of truck sitting on top of everything. Most other people with 4L60's and 10-bolts don't have to deal with that. I could upgrade everything like James B. has done with his Suburban, but at this point I'm thinking I'd rather take that money and save it for the first generation Monte Carlo I've always promised myself. (Oh yeah, and move the 3-4 shift point from 6000 to 5600 
)
)In OD isn't the driveshaft moving faster than the engine? Are you going to put a speed limit on the AV?
11-21-2004, 02:04 PM
#47
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Originally Posted by moregrip
I vote to beef it up if you plan on holding on to it for any length of time.
In OD isn't the driveshaft moving faster than the engine? Are you going to put a speed limit on the AV?
In OD isn't the driveshaft moving faster than the engine? Are you going to put a speed limit on the AV?
At 4500 RPM's in OD (.78) the driveshaft is doing 5800 RPM's, or dangerously close to critical speed. But at that point, the AV is doing 147 MPH, and to be perfectly honest, I don't plan on ever going there, or even close to there. I'll save that for the Autobahn and/or a vehicle made to go that fast.
08-17-2011, 10:30 AM
#49
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So, if I'm taking in this information correctly there is no driveshaft available that will be "bulletproof" because they are all too long to be safe at speeds above 100mph?
In the GMT900 forum I see lots of "I broke my driveshaft" threads where afterwards they had one built by Denny's or someone else. Is this just a waste of money? I want to upgrade before I get my cam installed so I can do 4th gear runs on the dyno, assuming an upgrade is actually possible.
In the GMT900 forum I see lots of "I broke my driveshaft" threads where afterwards they had one built by Denny's or someone else. Is this just a waste of money? I want to upgrade before I get my cam installed so I can do 4th gear runs on the dyno, assuming an upgrade is actually possible.
Last edited by 91Z28; 08-17-2011 at 10:36 AM.
08-17-2011, 07:16 PM
#50
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Are you shittin me? You couldn't have linked this in your own brand-new thread??? Anyway, to answer your question, no, this isn't an end-all, answer-all thread, because driveshaft balancing (or lack thereof) also majorly comes into play here. GM didn't set up any of the truck shafts (aside from maybe the TBSS) to go 120+ mph, therefore the aftermarket is needed to supply a reliable solution to driveshaft problems for those of us with trucks and no brains.