78 f250 puller

[MPac]

I'm working on my project that is a daily driver. I will be pulling cheater stock with the COPTC for the 2011 season. Specs on the truck 460 big block stock C6 with a 203 case. Yes it is full time 4 wheel drive. One question I have about pulling is. When I pull should I pull in 4 low or 4 low lock?

Now for you those of you not familar you with the NP 203 case normal cases that are part time when you go in a 4 wheel drive gear it distributes equal power to the front and back. with the full time case 4 low or 4 hi have a differental in it. Meaning it acts kinda like a posi. When its in lock its the same as a part time case. Which should I pull in? Low or Low Lock. Thanks in advance for your help.