Is chip needed when changing to 3.73's?

[bark3rd]

I am definetely going with 3.73's for my first mod. What is the deal with chip/speedometer/odometer issue? My mechanic is telling me that a super chip ($300!)is needed to fix speedo. etc. I hate to buy a stupid chip when I plan on getting a blower at some point and of course the chip would be useless then. If you guys say the chip will help performance for real then maybe I wouldnt feel so bad adding one. Is there any other way to fix speedo problem besides this chip? Is there maybe a better chip for the same price range? What about custom mapping like saleen offers? Also, I'm getting all sorts of warnings about bad bearings being discovered in GT's when rear end is pulled and to expect extra expense. Geesh, maybe I should just get the damn blower. Someone email me $5000, thanks.