Keyless Entry Conversion

I have a 96 Tahoe that has the old style chevy keyless entry. The remote works about 3 feet away from the drivers side door. This is about the same as my 95 firebird. Sometime in the late 90's Chevy went to the new style Keyless entry with a new rounded remote that works from really far away. Has anyone converted there old system to the new?

Oddball