SKCHEEE

Hey everyone I have a 2002 c5 with cam fast intake headers and I just bought a set of 3:42 gears and yank SS 3200 stahl convertor my problem is the install kit for the differential is on back order and may be 3-5 months my buddy was putting stahl and gears in for $1000 and I would have 600 in gears,install kit . Or should I take it to RPM TRANSMISSION. For around $2000 and that's including them slapping my convertor in while they already have everything apart . My next question is would it be worth all that money to go from a 3:15 to a 3:42 ??? Or would a 3:15 gear and a Yank SS 3200 stahl be a good combo ????