Are the 4962 aluminum Big Bore shocks actually shorter than the stock shocks like I have heard? I have a 3906 that I would like to upgrade the shocks on to these, but I really dont want them to be shorter than what I have already. I understand that the big bores come with 30 wt oil. Is this enough or should I use a heavier wt shock oil? Should I also upgrade the springs that come with the big bores? If so, which ones should I get? BTW, all I do is bash. Thanks.