Attention: TDR Forum Junkies Just installed a harmonic damper off of a 6. 7 onto the 5. 9 in my '04. 5. Of course the install also included the 6. 7 fan pulley which is needed to clear the new fluid filled damper of the 6. 7. Other than new bolts for the damper there is nothing else needed for this upgrade. The installation was made easier in my case because I was going to do a cam swap so all work on the damper and fan pulley was with the a/c condenser, intercooler, radiator, fan and shroud removed. One could do this upgrade by removing only the fan and shroud and you should have plenty of room to work. I also replaced the front crankshaft oil seal at the same time - from the outside, not a fun thing to do!
After removing the old damper and tone ring I cleaned up the snout of the crank with emery cloth and applied anti-seize. This is where the damper fits onto the crank. Loctite was applied to the damper bolts and they were torqued to 92 ft lbs. The fan pulley is a simple swap and I simply tightened the bolts very snug, don't know the torque value. The tone ring is machined into the 6. 7 damper so the old tone ring is no longer needed.
With the fan and shroud off I could remove the belt with a little effort by twisting the belt toward the front of the truck between the damper and fan pulley and then turning the fan pulley which caused the belt to work through. Install of belt is simply turning the fan pulley the opposite direction. If I have time tomorrow I will try belt removal with everything back in place.
First impression from limited driving is that the truck seems very smooth, almost silky. This first impression also includes newly rebuilt 50hp balanced injectors that were installed at the same time as the 6. 7 damper. Recently a rebuilt NV5600 and new South Bend OFE single disk clutch were installed and this transmission is by far the smoothest NV5600 I have ever driven (a total of 9). The new upgrade and the new injectors simply made it a dream to drive, at least at this point. One really impressive thing that I believe is due solely to the new 6. 7 fluid damper was the "paper test". Touching the edge of a full sheet of paper against the shifter results in a sound very much like an electric engraver. I always believed this to be engine vibration because it was present at idle while stopped as well as going down the road. After the upgrade I touched a paper to the shifter and there was absolutely no noise! Amazing! I will do this test again at highway speed and also while towing to see what happens. To me this equates to less vibration wearing on the clutch and transmission. Time will tell if any monetary benefit in prolonged component service is a result of this upgrade.
BTW, the 6. 7 damper and fan pulley are less expensive than buying the 5. 9 damper by far!
Cost for the parts was $276. 07 before sales tax. Damper was $224. 04, fan pulley $47. 07 and $4. 96 for four bolts.
The conclusion is that I need to order the parts for my '05 and see if the 6. 7 parts can also be put on the '01.
Godspeed,
Trent
After removing the old damper and tone ring I cleaned up the snout of the crank with emery cloth and applied anti-seize. This is where the damper fits onto the crank. Loctite was applied to the damper bolts and they were torqued to 92 ft lbs. The fan pulley is a simple swap and I simply tightened the bolts very snug, don't know the torque value. The tone ring is machined into the 6. 7 damper so the old tone ring is no longer needed.
With the fan and shroud off I could remove the belt with a little effort by twisting the belt toward the front of the truck between the damper and fan pulley and then turning the fan pulley which caused the belt to work through. Install of belt is simply turning the fan pulley the opposite direction. If I have time tomorrow I will try belt removal with everything back in place.
First impression from limited driving is that the truck seems very smooth, almost silky. This first impression also includes newly rebuilt 50hp balanced injectors that were installed at the same time as the 6. 7 damper. Recently a rebuilt NV5600 and new South Bend OFE single disk clutch were installed and this transmission is by far the smoothest NV5600 I have ever driven (a total of 9). The new upgrade and the new injectors simply made it a dream to drive, at least at this point. One really impressive thing that I believe is due solely to the new 6. 7 fluid damper was the "paper test". Touching the edge of a full sheet of paper against the shifter results in a sound very much like an electric engraver. I always believed this to be engine vibration because it was present at idle while stopped as well as going down the road. After the upgrade I touched a paper to the shifter and there was absolutely no noise! Amazing! I will do this test again at highway speed and also while towing to see what happens. To me this equates to less vibration wearing on the clutch and transmission. Time will tell if any monetary benefit in prolonged component service is a result of this upgrade.
BTW, the 6. 7 damper and fan pulley are less expensive than buying the 5. 9 damper by far!
Cost for the parts was $276. 07 before sales tax. Damper was $224. 04, fan pulley $47. 07 and $4. 96 for four bolts.
The conclusion is that I need to order the parts for my '05 and see if the 6. 7 parts can also be put on the '01.
Godspeed,
Trent
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