I built my B44.1 a few days ago and yesterday i hit the track with my new car. Everything was build likje the manual.
After 4 runs my rear gears in diff box cracked. After rebuild, I shimed it without any gaps in int. At the 8th run the same happened with the front gears.
After opening the front gear box at home, I found much play between the both gears.

Im running an LRP X12 6.5t 4dot timing in my B44.1. The slipper is build like manual.

What am i doing wrong with the gears, or are there any hints ?