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I've got a 2000 f450 with 90k miles. On the way home yesterday it was shifting from 1-2 and 2-3 very late- 1/2 throttle, and wasn't shifting to the next gear until 2800 rpm or so. Once it shifted into OD the converter locked and it felt fine. At 35ish mph it wanted to stay in second at 2300 rpm...

The ZF6 in my 550 is shot, picked up a low mile trans from a buddy, however my truck is 2wd and the new trans is 4wd. What is involved in swapping output shafts, cover, ect.

Not sure the best way to describe this but here it goes (assuming gears are labeled 1-6). 4th gear engagement is a bit off, like its not going in all the way, 5th is way off, and its impossible to get it in without grinding. Happened suddenly, truck popped out of 5th while under very light...

I've been looking at the GV od units for my 550, they rate them for 26k gcvw, not helpful in my case. I am usually around 40k combined. Is there any other option for a od or will the GV survive?