Rear End Gear Ratio Change

[Josh]

First post as a ZR-1 owner.

Recently purchased 1990 ZR-1 #2875 with 13,000 miles, all stock. Awesome car and a big step up in performance from my 93 LT1.

Initially I had a slight misfire at idle. Ohm'd injectors. 3 bad primaries. Replaced all 16 with new Delphi stainless injectors from FIC using Jerry's gaskets and o-rings (great products!). No more misfires.

I plan to eventually do the following upgrades to the car in this order:
-4.10 gears
-Long tube headers/exhaust (delete cats)
-Ported plenum/IH (and heads if I ever pull the engine).
-Updated PROM

So onto the first item, 4.10 gears.

The car pulls like crazy when RPM's are 4k-7k, but it feels a bit sluggish down low and the ratios are too tall in all gears for my tastes. That said, and considering future modifications, I have decided to go with 4.10:1.

Which brand, where to get, what additional parts needed, things to do while I'm in there, tips and tricks, etc.

Thanks