biggest load yet
My buddy's father-in-law, pulled a 14k shed on a 26' bumper pull trailer....that wieghed 6,000 pounds haha!he went from Phillipsburg to just outside Missoula, that totalled 87 miles....With my buddy's 7.3l with a Banks in it, the old style XD! I followed him from Phillipsburg with a gooseneck flatbed that had 9k on it. I could feel 'turbo' groaning cause it was N/A at the time. Now I wanna try it with a turbo in it, however I still need pyro/boost guages.
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At 2800 RPM, you're just entering the powerband...trust me, mine sees a LOT of time above 3000 RPM.
It's not uncommon for mine to be near, or even rest on the governor if I'm pulling a hill and can't shift into 3rd.
With 3.55 gears, my 3rd gear lays on the governor at 60-62 MPH...so when I'm running heavy (like 5k on the bed) and actually going fast, I drop from 4th to 3rd and hold 55....piece o' cake!
There are a few places I go where I can't get a running start. Pull out of the driveway, and you're on the hill already. I pull a 1-2 shift and run 2nd all the way up the hill. 2nd gear will hit the governor at 35 MPH, so I run between 30-35 MPH up the hill. I can't shift into 3rd, the truck needs a running start to pull the hills in 3rd without a turbo.
Those are loaded scenarios, empty is a whole different ball game.
Nice to hear about another loaded success story! Even funnier that your buddy thought the ol' junker couldn't do it!!
You showed him! 
I call B.S. on not towing in OD on the ZF5. I wouldn't tow in OD on a stock automatic mainly just because of excessive heat build-up. But if the transmission was sporting a second transmission cooler, I would do it. It takes a lot to break these trucks...it seems like some folks think they're as tough as tin-foil...I beg to differ

Here's a copy and paste of my favorite IDI quote...from Towcat
"I went though 3 ZF5's in my F450 carrier from 1993 to 2003. put 980k logbook miles on the chassis. If I didn't put the truck into 5th gear on the freeway, I'd get run off the road. running an average gross of 15-17k lbs, the 5th gear did fine. if you ever owned a F450, you will testify the powertrain is extremely underrated by the factory..
I hydrolocked my first motor at 650k. I stopped giving it any love at 475k.it had low oil pressure, so I stopped changing the oil and stopped adding SCA's. it made it that far with pure neglect. the second motor is ready to be changed out, it's got a fair amount of blow-by now and the draconian smog laws got set back two years. therefore the truck is getting re-powered this spring..anyone who tells you these motors need to be babied is F.O.S.
With my '92 CC dually, I might drop into 4th going up the grapevine pulling 14k GCVW but the truck is doing the speed limit with some throttle left before hitting the floor. thanks to the IC, the EGT's are a non-issue. I'm pushing 900 deg at the end of the exh manifold on the driver's side. even unloaded, the F450 is down into 3rd pulling the grapevine and it tares at 9500lbs. turbo and IC makes a big difference with these trucks. If I was the only driver in my F450, it would get a turbo and a IC in a hot second." All from Oreo's thread here: https://www.ford-trucks.com/forums/10...ith-5-38s.html"






