Bag A is the center differential build, as you have probably noticed or seen in our release articles, the differential is much larger and beyond that it uses ball bearings where the outdrives are inserted to reduce friction and make the differential more consistent through long runs. The first picture shows all the diff parts and the second shows the tools I used to complete bag A as well as bag B.
I used O-ring grease on the O-rings and the outdrives but beyond that just followed the directions. Later on I will explain how to break in the outdrives before you hit the track. Use all the shims included when building the diff.
I like to fill the diff with fluid, then insert all the gears including the top gear. Then you wipe off all the excess fluid once everything has settled and make sure that the diff is filled up to 1mm below the top.
Bag B is the front and rear diff builds which means that the same tools are used and the process is super similar to the center diff. Again later on I will show how to break in the outdrives, but just like the center diff use all the shims included and fill to 1mm below full.
*Optional* It majorly helps in the first couple of tanks on the track if you scuff both sides of the outdrives with a Dremel.
Alright time to build something that isn't a diff, Bag C is the front gearbox. Again the first two photos show all the parts and all the tools used for this step. The shock towers and A,B,C,D blocks are in a separate bag so keep that in mind when opening your kit.
The new gear box makes it much easier and quicker to get to the diff. When installing the front center universal I like to fill the hole where the set screw goes up with some blue locktite so that once you insert the set screw the locktite is pushed between the universal and the pinion gear which creates a better seal. Then just blow out the excess.
Before installing the front differential into the gear box I added some heavy metal grease. I didn't have to use any of the included shims when installing the diff but make sure to check for proper fitment.
The overall gearbox design makes maintenance much easier and is a nice change from the .4 and previous models. The NB48 2.0 includes the new updated shock standoffs with captured bushings as a standard part.
*Optional* It really improves the way the car feels on the track in the first few tanks of break-in if you scuff all of the universal and CVD pins where they enter the outdrives with a Dremel.