240 5spd. Driveline adjustment, time to get it right (?)

[Lilleyvanilli]

I've just had my 240 5 spd. non-adjustable driveshaft rebuilt (been shortened/installed for years), but I', really trying to get a better parallel  mate-up of output flange-to-guibo and find I'm running into some challenges vertically at the tranny mount area.  It appears I have to go upwards to get flanges to align better but don't think I can, as engine mounts don't adjust (or should I try loosening them along with my new tranny mounts?) and the TOP of the tunnel is pretty dern close.  BUT... currently, my 2 pc. drive shaft is installed dead-nuts straight with only one washer under the center bearing support.  If I raise the tranny, i have only one washer's-worth of vertical adjustment to raise center bearing too.  Not sure what to do.

 

All this nit-picking after recently examining the old guibo once out of the car.  It appears that it has a slight "roller-coastering" due to more of a gap between drive shaft flange and guibo (about 1/16 "- 3/32").  I guess it's time to slide the diff. forward? (but doesn't moving affect rear alignment? need to take it in to re-align afterwards?).  With the drive shaft in position and NOT attached to the diff., I would have thought I could just shove the drive shaft forward to close up the space at the guibo (thus transferring it to be a gap to the rear, now visible at the diff.).  I can shove the drive shaft forward by hand all I want, but the gap by guibo won't close up. 

Will shoving the diff. closer be what's needed to push the driveshaft closer to the guibo... if, when everything is loose-fit (no nuts), I can't even slide drive shaft forward by hand to eliminate the gap?  Seems like pushing the diff./drive shaft forward could put stress on the tranny output shaft & greased input bearing assembly, if I'm not careful.  Thanks for any "input", ha!

[jimk]

You can bend the mounting ears on the carrier bearing so the bearing sits lower.  That achieves the same alignment result as raising the transmission rear.