Note about potential issue with bolts.
Hi Clark, there is a potential issue that may arise over time due to the added layer onto the differ rear cover.
The supplied bolt may work a little loose over time and hard runs due to flexion and thus begine to leak slightly. I thought it was my differential cover plate but it wasn't. After cleaning and tightening bolts again the leak stopped.
Perhaps a copper or crush washer to seal would help counter the issue.
Will add inspection of differential bolts to list of regular maintenance intervals.
I recommend adding a notice to customers about this potential phenomenon in your install instructions and website.
Vt