Which 'chassis' are you using? That's a 'Long' universal shaft from the picture.
In July this year I used my first '2 shoe trans'......giving up my 40/46 tooth option and getting away from the 'sling-finger' GT1 trans clutch. That 'front dogbone' that comes with the '2 shoe' trans is 91mm......the clutch bell has a 'spacer' to handle a '5mm or so' length difference in the new trans length.
GT1 (short chassis) w/early trans requires 84mm front 'dogbone'.......new '2 shoe' requires that you shorten to a 78mm front dogbone. That front 'uni' drive doesn't have anything to do with 'gear munching' unless you do not set front diff. gear mesh properly and then your 'front end' .......disembowels itself. Give me a clue as to 1. your chassis, 2. your trans..........I ran the 'early' slingfinger for 5 years..........went to the '2 shoe' only because my motor can now provide the speed I got out of 'the 40/46 trans' alone.
It's a weeeee bit of a '3 hand operation' to get 'pinion gear mesh' at times but that's where I've seen most of the problems. If you are running where you pick up rocks in the gears, you can't prevent gear damage. Setting mesh a 'bit tight' always worked best for me. (15/19 pinion on 43/46.......15/20-21 pinion on 40/46)
(feel free to PM me for clarification)