divorced 205 overdrive?

RufusTheRam

New Member
Joined
Mar 21, 2005
Location
Raleigh
anyone have any thoughts on how a divorced np205 would fair if flipped to create an overdrive box? the application would be a 2wd medium duty chassis w/ 5.9 cummins.
 
Nothing really valuable to add except I have been wondering the same thing, but for a different application.

If you try it let me know how it works. Only concern I can think of is wrong side gear loading.
 
on a MDT I think it would be a weak link in the drive train.. Seek out one of those auxiliary overdrive units..

Not sure of your specific problem, but you might regear (if possible) or get some new wheels and run 22s.
 
i thought of an aux. unit specifically made for that, but figured they'd probably be pretty exspensive? what are some brands of aux. od's to look for? i'm basically a n00b when it comes to medium/heavy duty stuff.
 
There was a guy in Top Truck Challenge a few years back with a K5 Blazer running Unimog axles, who had a T-case flipped backwards for overdrive. It seems like he said he had to switch to a different type of bearings because he burned something up the first time he tried it, but after that it worked.

Now that I think about it, he might have been running a 203 range box backwards.

My intial thought is that with a lot of highway usage, especially in a MDT, it would probably have issues.

Are the gears in a 205 straight-cut (spur) gears rather than diagonal (helical gears)? If so, then the direction it spins *might* be less of an issue.
 
Sorry ruff forget about this one... like braxton said its been on PBB a few times.. THe hardest part is locating one.. Those theads said grain trucks in the F600-700 ish size range etc.. The old standard Georgie OD, heard about a Brownie (aka brownie box)

On a MDT you might just try to swap in an OD tranny or fix your axle gear to better support 1:1 at higher speed.. (or add taller tires)

The Spicer 5speed that was in the Uhaul was non OD so it had a decent spread and with a more powerful engine (or remove the box) you could easily pull a taller tire.. a basic/common 10 speed would definitely give you lots of gear options. Basically run tall tires but never hit 1:1 unless your on the flats..

Note: just from doing all the research I could on the MDTs it seemed 4:10s (uhaul had 4.33s) was on the low side of what gears were offered in the MDT axles (rockwell/spicer).. It wasn't until you hit the HDTs that they started coming back down again..
 
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