2.73 upgrade to ????????
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
Gears aren't going to give you more low end power. They're going to shorten the powerband, making the low-end disappear and replace it with the mid-range RPM. Then, if you have auto, you also need a good converter to make the most out of it. If you just want a little more fun, I don't suggest going higher than 3.45s because your gas mileage will drop horribly. That, and L98s don't like to rev higher than 5k.
If you want more power, swap in a better exhaust system. Throwing on a dual exhaust with LT headers and muffler elims will give you ~40hp to play with.
If you want more power, swap in a better exhaust system. Throwing on a dual exhaust with LT headers and muffler elims will give you ~40hp to play with.
Team Owner
Joined: Sep 2001
Posts: 62,153
Likes: 1,731
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
3.07 is an optimal ratio for L98 automatics, but since going to that from 2.73 is hardly worth the expense, I recommend changing your torque converter to one with a stall around 2200-2400RPM.
Would give you the feeling of more power at stop lights without cost of mileage.
Would give you the feeling of more power at stop lights without cost of mileage.
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
I went from 2.73 to 3.07s. I really like the new gears.
With the 2.73 and OD I could cruise at 85 MPH all day and still get good mileage. I would shift into OD at about 65 MPH.
But, around town it felt sluggish. The 3.07s woke it up. Then I had a 2400 Vigilante installed. The difference is like night and day and I still get decent mileage.
With the 2.73 and OD I could cruise at 85 MPH all day and still get good mileage. I would shift into OD at about 65 MPH.
But, around town it felt sluggish. The 3.07s woke it up. Then I had a 2400 Vigilante installed. The difference is like night and day and I still get decent mileage.
Last edited by Kool88vette; Aug 8, 2008 at 10:08 AM.
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Thread Starter
Racer
Joined: Apr 2007
Posts: 305
Likes: 0
I do agree with everyone here. There is not much of a difference between the two. I was thinking of a gear ratio something in the mid three's but you guys all think differently. Mid three gears not right for a L98?
Team Owner
Joined: Sep 2001
Posts: 62,153
Likes: 1,731
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
No, not for a stock or anywhere-near-stock L98. The powerband is too short for them.