Got it torn apart today. The stock tcase coupler : Stripped. The marlin coupler (crawl box main shaft): Stripped. SO heres the good news, i have a spare coupler, and a line on a tcase. Now how do we prevent the stripage? The crawl box had a vibe since the day i put it in, this i blamed on drievshaft angles. The vibe was only noticed when you would touch the shifter or if change was on the boot. This happend almost 1 year to the day since installation. My trucks a DD (put about 10-15k miles on the crawler) and i went on 4 wheeling trips with it. Probibly had it in double low for less than a half hour. Im on ifs and 33s so nothing hardcore lol!! I will call marlin when i get a chance, just to give them some info on some product breakage for their own knowledge. Not blaming marlin, just that crappy 3/4" of spline engagement on the stock taco tcase input. Is my only option a lefty in the future?