Mike;
Everyone has their own opinion, you may have access to 'cheep' labour and parts,good for you. Most of us have to pay the going rate. Paying $190 for gears, $330 for possi, new bearings ,seals,fluid,install kit $100, then $ 200 for installation. Eight hundred bucks plus the cost of the original 'used' rear end is alot of money and you haven't even replaced the U joints yet or shocks.The point was it isn't cheep to use an IRS. For a novice it's a complicated set-up. If you are a professional then it's a cake walk,but a man doing a project with his kids may want a more economical and easier set-up. Also 3.73 gears with a tremec will make 1st gear useless,lots of rubber.
I still wish you good luck on your car,remember it's your car,don't put something on it because of what someone says is better or wants to sell 'up' options.You can cruise for years on that extra money.
Perry.
