Just curious if anyone knows how to quickly recalibrate the speedo gear on my BW4401. I plan on running larger tires when I go to the dana 60--stock to 35" tires. I am already running larger than stock tires 235s to 265s and I nitice ~3mph discrepancy. Thanks.

Check out this thread. Should answer your question:

http://dieselplace.com/forum/showthread.php?t=24991

Thanks, I'll see what I can figure out.