The 9900i I drove pulling food tankers was right around 78 - 79 somewhere. That's running a C-15 500, and 3.42 rear ends. The truck I drove hauling heavy equipment would do 73 (governed, of course). This was with a 500 DD60 and 4.11s. The end dump I drove wasn't governed, but, with an East Quad, and only a 350BC, it was geared so low I could only go about 71 or 72. I was told the truck itsself originally came with 3.36s, but then 4.33s were swapped in, without replacing the 13 direct it came with. So, in effect, I was turning almost 1900 at 65.
As for dump trucks.. the RD46 quad axle I was just taken out of would only run, at best, about 72 - 73, and that was empty. Loaded, you could just forget about it. I'm not sure what the rear end gears were. I was told they were 5.03s, but I never could find the product specs plate which told me what they were. The motor was a 350hp E7. The quint axle CL713 I drive now has a 427 E7, and can do 75 with plenty to spare. I've never felt the need to drive it past that. Likewise, I don't know what the rear end gears on this one is, either, but I can tell they're considerably shorter than the RD Mack I had previously. But this one also has the 8LL, with deep reduction, so, if I ever need it, it's there.
Oh, yeah.. there was also that little stint where I got the "bright" idea of going to Swift as an experienced driver. Yeah, I get the "jackass" award for that one. Anyhow, running a 2003 Freightliner Columbia, with a 455/490 DD60 (this was one of the trucks with the dual stacks on the side, and no fairings, which were exclusively ordered for the flatbed division. The typical Columbias and FLDs had a 370/430 DD60), 9 direct, and 2.93 rear ends, I was turning 1500 at 60. I don't know what they turn now that Swift's been turned up, but I'd imagine it would have to be at least 1600 - 1650 at 65. Of course, they've probably changed the product specs on the trucks they've purchased since then.
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