A must. The filter bolts are one time use. Use 24050764 bolt kit which will have the two filter bolts and then a couple others you won't need. The filter bolts happen to also hold the valve body in place, hence their one time use-ness.
Pan bolts are 93 lb in torque spec.
Filter bolts are :
First Pass:(44 lb in)
Final Pass: 128 degrees
There is a note per GM on diesel 1500 10 speeds:
For diesel applications, the transmission fluid level should be checked only after the TFT has reached or exceeded an operating temperature of 105°C (221°F). Once the TFT has reached or exceeded 105°C (221°F), let the temperature cool back down to 75-80°C (167-176°F) before checking the fluid level.
The level check plug is on the driver's side of the case, towards the rear. You can fill it from there with the engine OFF at first until it starts to pour out and get as much as you can in then so its not a dry start. Put the plug back in, fire it up and shift through the PRND and back (spend about 5 seconds or so in each position to properly fill). After that I would fill it until it comes out while running and then drive it and cycle the temps as indicated. After that, engine running again, PRND and back and then set the level again.