I'm upgrading from a 1.6 to a 1.8 diff. I picked up a manual 2005 driveshaft from a yard (one of those where they pull it and charge you a premium). That shaft had bad u-joints, so I swapped it for another. They gave me one from a 2004 I think, but an Auto. I know that 1.6 are the same, but are 1.8? They said its the same.
Anyway, it does not fit into my 5 speed trans. Its OD and ID are slightly larger than the 1.6

What am I missing here? should I just get a rebuildable drive shaft?



Never mind.
called the junkyard, it was from a 99. they have the right one for me, only a 2.5 hour round trip :/

 

Still should not matter. The 1.8 shafts are cross compatible for auto, 5sp,and 6sp. Maybe they just gave you the wrong shaft?

 

I read that NB auto have a larger output by about 1/16" but info is scarce, seems like you might have confirmed. Apparently a NA auto driveshaft should work?

 

Na8 auto shaft should work. The na6 shafts are different auto/manual and only correspond to their native applications. I’ve personally swapped 2-3 NA and NB shafts into my na6 5sp with no leaks so I’m convinced they are identical.