LT1 with A4 and 2.73s (WHY)?
11-26-2014, 08:46 PM
#1
Teching In
Thread Starter
Join Date: Nov 2014
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
LT1 with A4 and 2.73s (WHY)? Hello all, I just purchased a 97 Z28 LT1 with a 4L60E and 2:73 gears. Can anyone tell me why GM would put this combo in a Z28? I remember back in the late ninety's gas was cheap so I wouldn't think GM used this combo for gas mileage reasons, especially in a Z28?! 
11-26-2014, 10:59 PM
#3
LS1Tech Administrator
iTrader: (3)
Join Date: Nov 2001
Location: Schiller Park, IL Member: #317
Posts: 32,006
Likes: 0
Received 1,458 Likes
on
1,051 Posts
Not much actual difference in 1/4 mile performance between the 3.23s and 2.73s. You'd need to jump up to a 3.73 to realize any significant ET reduction. Better yet, go with an optimal stall speed for your combo and there will be no more than about 1-2 tenths of ET difference between 2.73s and 3.73s.
I've had two of these cars stock with 3.23s and two with 2.73s, frankly there wasn't any drastic difference IMO; the 2.73s do feel a bit weaker off the line but not excessively so in my experience. In fact, at certain points the 2.73s will feel quicker as they will allow for a WOT downshift to 1st gear at higher speeds than 3.23s.
I've had two of these cars stock with 3.23s and two with 2.73s, frankly there wasn't any drastic difference IMO; the 2.73s do feel a bit weaker off the line but not excessively so in my experience. In fact, at certain points the 2.73s will feel quicker as they will allow for a WOT downshift to 1st gear at higher speeds than 3.23s.
