Here is a summary of what I did, You use this info at your own risk, I assume no liability if you do this swap.
Flip the saw over and remove the 4 bolts holding the base, remove the base.
Have the arbor all the way down (blade removed, riving knife should have been removed before flip).
Adjust angle to access big nut on motor pivot, first remove belt tension bolt, Remove big nut now raise the arbor some and the belt will loosen, slip belt off arbor pulley, the motor will now slide off the pivot bolt but you may have to turn the height wheel as it comes off.
Adjust back to 90 remove angle wheel and 2 bolts holding the plate, unscrew shaft.
Remove height wheel and pointer.
Remove rear trunnion cap.
Remove main trunnion, tipping and turning to get height shaft thru slot.
Remove parts from trunnion, once bare press big bolt out. The arbor does not come off till the bolt is out. I did it with the nut on but down past flush so if I messed up threads I could clean them up with the nut. Probably didn't need it. If you put nut on take it off after bolt starts to move.
Arbor pivot hole must be lined up when you put the bolt in new trunnion. Press bolt in. The metal plate that guides the arbor must be on before the arbor is installed. That plate guides the riving knife leave the bolts loose. The arbor will not move up and down that slot till reassembled.
Do not forget the part on the old trunnion that the angle shaft threaded in, easy on the retainer.
Put all parts on the new trunnion, reinstall trunnion and trunnion cap, snug bolts.
Install angle shaft and tilt to put motor on.
Have the height wheel on, place motor on bolt, get belt on as motor is installed, turning wheel to mesh gears, install big nut and tension bolt, if you get big nut too tight it will be hard to raise / lower blade. Crank motor down to tighten belt, might have to pry as in manual, double check belt alignment on both pulleys. Tighten tension bolt.
Reinstall base, flip saw upright, install blade and riving knife.
Everything needs to be adjusted;
Riving knife - adjust the slotted plate to keep knife away from blade when raising / lowering
Recessed screws on table top back out till blade is aligned.
Trunnion - I won't detail, we all know this but remember the angle shaft holds the trunnion from moving side to side, if you need to move the front cap, I had to 90 the blade, measure, turn the angle wheel in the direction I needed slack, tap cap, re-90 the blade then measure. I did have all 4 bolts loose.
Table top screws - facing the saw, right is 45 and left is 90
Adjust angle pointer.
I did turn mine on with the blade removed, just to be safe, but all was fine.