Will new orders have mounting bolts with liquid loctite? You guys really set the bar for customer service!

 

Once you disconnect the driveshaft, check the pinion flange for any "play" in-out and up-down. Unfortunately, a loose pinion flange will need to be "cured" by having the pinion bearing pre-load set properly. This is done with a new "crush-sleeve" between the bearings and torqueing the pinion nut to proper specs. This is another case where the pinion nut is either a "nylok" locknut or a "stover" locknut. Care must be taken to ensure there are not "false" torque readings in this case also. We truelly believe that ratio changes should only be done by professional "axle" technicians. We have seen too many "shops" not get them right.

 

Yes, all shafts from here on out will have no "patch" on the bolts and will be supplied with red loctite.

 

Just wanted to say (without starting a new thread) that I just installed my Shaftmasters 3.5" direct bolt-in shaft last week. It went in like a breeze and I've had the car up to 110mp without any noise/vibration problems.

I can't say that my butt-dyno notices much but that's probably because I'm still having fun with the saleen s/c

 

Way to "STEP-UP" Shaftmasters and research the problems!!!!! I have bought and installed 2 of your driveshafts and have had no trouble at all. Great product and great customer service!!!!

 

installed mine 2 weeks ago. had up to 110mph a few times. got it up to 145 today no problems at all. will have it at the drag strip on the 10th of april and see if it helps my et.

 

Just my 2 cents worth. I installed my new Shaftmaster DS along with a new UCA and had vibration issues and it ended up being the UCA which was for a lowered Mustang. Went back to OEM UCA and all vibration issues were resolved. So it only makes sense to me if you installed your new DS on a lowered mustang and still have the OEM UCA, your pinion angle is going to be off thus causing vibrations at higher speeds.

 

That makes no sense whatsoever, I think you have your wires crossed, you flipped either the conclusion or your workflow description.

I'm following this thread with interest as I'm considering the one piece DS myself and my ride is -1.5".

Strikes me that a lot of you guys are settling for the vibration issue. If your shaft is becoming a vibration issue at 85mph+ but you're living with it because you don't go that fast usually, that's weak.
Firstly, if it vibrates at any speed then there's a problem, and problems like that have a habit of getting worse. The other thing is that, just because you can't feel it vibrating below that higher speed doesn't mean it's NOT vibrating at the slower speeds, it's just that you don't notice it.
Vibrations are bad. They will eventually affect everything around/attached to the part which is vibrating and after a period of time things will prematurely wear. Universal joints, Pinion bearings, seals.....

If you have a vibration get it fixed because it isn't 'right'. A one piece shaft is infinitely easier to balance than a split shaft. What I mean is, a One piece shaft shouldn't vibrate 'by design'. As soon as some guys posted up that their Shaftmaster doesn't vibrate at any speed, like "Graygt07", then we all know that to be true.

 

You're going to get more NVH with a one piece design over the stock. Period. Whether it's barely noticeable or effing terrible is the question. If you can't notice a difference vs. the stock in NVH then you aren't sensitive enough to tell.

 

Yeah resonance (large vibrations) occur when the natural frequency of the system matches the forcing frequency. The natural frequency of the shaft is fixed and probably does not vary much between shafts. The forcing frequency is the output speed of the transmission. Therefore, if someone has a vibration at 95 mph with 3.73 gears, someone with 4.10 gears will have the vibration at 86 mph. With 3.31 gears, the vibration wouldn't be until 107 mph. Different tire sizes will also give vibrations at different speeds since it changes the driveshaft speed. Automatic and manual transmissions will also have different speeds at which the vibration peaks since the fifth gear ratios are different. If we want to sort out the natural frequency of these shafts, then people need to post up at what speed the shaft vibrates the MOST and then their transmission, tire size, and rear end ratio.