i have a 92 z-28 with a 305 and automatic transmission. if i get better performing gears like 3:73 how will this affect the car. will if ruin it's driveablity (it's a street car)and how high will the rpms be on the highway at 60 or 70? is it worth it for the performance gain?

 

Most people will say 3:73s are too low of a gear for TPI. If you want drivability go with 3:42 these are the best all around gears. Right now I have 3:73s and at 55mph with 25in. tires I tach 2k rpm. It's kind of annoying driving to college and home on some weekends a 200 mile trip taching no more than 2500 rpm. I haven't noticed a decrease in my mpg though and that's going from 2:73s. However, if you change gears your speedo will be off also affecting your odometer.

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite