"Maybe drivetrain" - rear Drive Shaft or Axle Shaft?"It may well be normal, also depends on the intake setup. You get in a certain rpm range and they do drone a bit."- I have no tachometer but it is very loud droning."Exhaust resonance" - I must try.Can it be the transmission?

From 45-50 mph, my engine makes loud humming / droning. Come by the engine or can also come from the drive?

How can i adjust correctly the Vacuum Regulator Valve? I take a special Tool?

Thanks guys for the answers and sorry, that I'm late with continuing this thread, but I'm sick and I'm not really able to do anything. But ok, I can torture my computer again :)Will a E4OD easily fit to a 6.9 IDI? Is there anything I need to take care of or have to fabricate any mounts etc...

I'm so sorry. I used the wrong words and so this question got misunderstood.All I want to do is to convert my C6 3-speed-auto into a 4-speed-auto. Has anybody any ideas? Or has anybody done that before? What parts would I need for this operation? And is there some kind of kit available...

Hi Fellro,Yes, I would like to upgrade to 4-speed. A friend has let do that. Is there a kit?

Can be upgraded with a C6 4WD 3 gear on a 4 speed?Best RegardsRonny

When you accelerate (accelerate). Yes smells like burnt oil.

How much engine oil does the 6.9? 10Liter?My 6.9 engine making blue smoke. Why might that be?

How can you differentiate the 6.9 from the 7.3 engine?

Fits the Automatic Transmission from 85 Bronco on the 85 F350 6.9l Diesel?

Yes will install the orginal steering wheel again. All parts in the engine compartment are indeed present. Only the electrics missing.I have installed only the control unit from the gear vendor unit.

Ok. Is theSwitch for Gear Vendors overdrive unit.How does the cruise control? Only the originals steering wheel?I have this steering wheel.

For what is the switch? Cruise control?

No problem. Maybe you yes the connection of the cable. I first a new cable from the fuse panel down and connected to dfas green / red wire. Now the alternator is working again.:)