Matching mack wirth fuller

I want to say sure. Work? Lots of ratio options. It will bolt up and run.

 

Lots of things to thank about. Do you have one of these half cab things with the engine tilted. That probably will not match up. Fullers have 3 different shift tower top plates. Shifter front center or rear? Different off set shift levers off the tower. Then you know driveshaft size and length. Electrical or mechanical speedo?
I have done several. Look long before you jump into that.

 

Clutch disc in backwards? Dirty input shaft? Worn splines?

 

Did your pilot bearing in the flywheel have a snap ring on it? The snap ring is only used with a Mack transmission. When using a Fuller transmission it must be removed and the pilot bearing driven the rest of the way in.