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Friday, my wife comes back from her weeklong training in Des Moines... two more weeks of that to go... Sad thing is, I have so much studying to do, not gonna get a whole lot of time to visit really, but then, so does she!
Not currently running the GV unit after a driveline failure did some damage, but prior to that, things were great with it. The truck had a 4.10 rear, so the Cummins didn't like the higher rpms, did ok, mileage wasn't all that good, kinda lost it's pulling power trying to keep the revvs up there. When we had the auto box in it, we ran double overdrive and it got decent mileage, mid teens at best. After killing a second auto in short time, we went to a manual, which is what we had wanted all along anyway, and the F350 had a ZF in it originally. With the GV unit and the NV4500, it got to upper teens pulling. The rear diff went out, so figured that was a good time to change it up to a 3.54 set, so with the gv unit still out, and the 3.55 rear, it now consistently runs mid to upper teens pulling.
What I did was took a tired old 460 and ZF out and put the Cummins in myself. I fabbed everything for it, so that is part of why the ZF didn't get used from the start. I also didn't want to swap the starter over to the passenger side, I really like having it on the opposite side of the exhaust... If the adapter plates would keep the starter in the stock location, I would be more interested in using them. I did the driveline, ut I think I goofed a littel on the last install with the manual, as it was the first shaft to fail over the time I had the truck on the road. It may have been the length, or the ujoint, but something wasn't quite right. The driveline it currently has was built by a shop over to Peoria as that was where the shaft came loose and went catastrophic. Got lucky in that we were able to reuse the front yoke, and they fabbed up the rest of it all the way to the rear. They discovered the damage to the GV unit after they had built the original shorter shaft. The GV unit also came with the wrecked donor truck. The motor has all of 250,000 on it by now, maybe more.
That was partially due to the 4.10 gears and the crew cab with heavy flat bed. The truck rarely runs down the road without some king of trailer hooked up and loaded... The Cummins motors don't like to turn fast, they really get thirsty if they do.