FellowTraveler
Well-Known Member
And, gassers do not like to do much below 3K RPM where all indications point to that the gears whine around 5K+. Would not like to see the results if my 6.5 turned that fast
I just dropped the Burb's differentials to 3.42's and am very happy with the decision. For a muffler, I am only using a 30" FTE resonator. Wish list is to figure out how to cram a shorty muffler inline as well.
When empty I cruise at the speed limit and at 70 mph in OD, there is drone, but the motor is only turning ~2K RPM and is more quiet than any other time.
When towing the closed trailer, I limit the speed to 55 mph and keep the tranny in direct which puts the RPM's just over 2K RPM. Again, the power-train is most quiet at this point.
Also, turns out that the P-400 is more quiet under load than the other blocks, so the combination of motor and gearing turned out much better than I expected in terms of sound.
I ran 3.42:1 for many years and loved them, as for your drone perhaps; a smaller diameter pipe w/90 turn and run along the side of the FTE installed before/after it maybe the only real option to fit & cancel out the drone.