Well my delema is Im not sure which gear to install. See I went to the track last week and I noticed my 4.10s are humming extremely bad and Ive also noticed vibration. So I ordered a new set of 4.10s to have my dealer install them , but Ive heard that with 28 x 10.5 Mickeys I should get 4.30s instead. Ive also heard that too much gear will slow me down b/c with a blower car you'll be out of the power band to quick and wont let the motor put the power down. Is this true? I went 118.11 crossing at 5200rpms with 275/60/15 dr , And Im getting a new pulley tuesday so Instead of 10 to 11 psi I should be around 14 to 15psi, Can anyone give me some good advise. Thanks.